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Battery Chargers

In this page you will come across more than 100 well researched 6V, 12V, and 24V, 48V automatic battery charger circuits which will operate in a technically correct manner and ensure a safe and optimal charging of your battery.

We can define a battery charger as an equipment accustomed to supply electric power into a supplementary cell or rechargeable battery pack by pressuring an electric current into it.

Battery Charging Expertise only in this Site

In other sites you may find many related posts which are mostly technically incorrect and the authors have little or no expertise to verify it for you or answer to your specific queries.

I have presented more than 100 thoroughly researched best concepts which promise not only the most ideal way of charging your battery but are also equipped to implement the same with utmost care and safety.

There are plenty of choices you can get while designing your own charging systems as per your specific needs and battery ratings.

Battery Basics

Before building a circuit it would be important for you learn some basics of battery charging.

Remember many people may advise many critical things, which might scare you regarding batteries and their charging concepts. Don't listen to them!!

Batteries can be compared to our body, they do not like working under stressful conditions. That's the most basic thing you must remember while charging a battery.

Second fact is that, batteries don't like getting overcharged.

The third fact is batteries do not like warm conditions, so just make sure your battery stays cool while it's getting charged.

However, if you try to keep the battery temperature lower, the charging rate might need to be lower too, making the process slower, and vice versa. Although this may be a downside, the good thing is that lower current rates will always ensure a long life for your battery

Difference Between Lead Acid and Li-Ion/Lipo Batteries

As far charging criticalities are concerned, the above conditions remain the same for both these counterparts.

However Li-ion and Lipo batteries are designed to get charged much quickly than lead acid batteries, through a higher charging rate. But that doesn't mean these won't accept charging at lower currents.

Lower current charging is the recommended method if you are OK with the excess delay in the charging time.

If you are not OK, and want your battery to get charged quickly, in that case you may require special chargers having temperature compensation. Or if you are not using a special charger just make sure to include a fan cooling for the battery.

A Couple of Technical aspects

There are a couple of technical things which must be strictly followed before designing a battery charger:

1) The Charging Voltage
2) The Charging Current.

As a rule of thumb, ensure that your battery is never allowed to be charged further, once it reaches its full charge value.

Do not charge your battery with higher currents above its optimal rating. Keeping the charging current on the lower side will always be beneficial to any battery.

To maintain the above conditions, simply make sure your charger includes an overcharge cut off, and a current controlled input power supply.

For Lead Acid batteries the optimal charging current rate can be around 0.1C or 1/10th of its Ah value, and for Li-ion it may be 0.5C or 5/10 its Ah rating.

For more detailed information regarding the various types of automatic and semi-automatic battery chargers or tutorials, you may select the one as per your requirement from the below given list:

12 V Battery Charger

Lead acid batteries are the most common type of batteries especially because these can be applied for big and high current applications and these are so far a lot cheaper than Li-ion batteries. Although not as efficient as the Li-ion batts, these are still more popular than other form of batteries. You will discover many good lead acid battery charger in this blog to suit your specific battery specs.
Among all lead acid batteries variants 12V lead acid batteries are the most popular type of batteries and are presently widely used for most of battery driven gadgets. These are ideally suited for applications which require high power output such as in car electrical, inverters, power LED lamps, and with solar charger modules.
Charging a 12V battery requires a good quality charger which must be equipped with a 3 step charging involving High Current Bulk Charging Moderate Current Bulk Charging, Absorption Charging, Float Charging. You can get more details in the above link

6 V Battery Charger

6V batteries are also mostly found in the form of lead acid batteries, but there application range is relatively limited compared to 12V counterpart. Because being less in voltage means the battery will need to be really huge for delivering high current outputs and therefore are not used in high current applications ranges. Nevertheless the charger for a 6V battery also needs to be equally good with a 3-step charging and auto cut off system. More explanation is provided in the above link

24 V Battery Charger

Just like 12V batteries 24V batteries are also widely used in a huge number battery operated devices, especially one which involve huge wattage or operate with high current loads. Being higher in voltage ensures lower current even for higher rated loads and helps to keep the system compact. These are also mostly lead acid types preferably with deep discharge facility, and the charging process is quite identical to the above discussed batteries which require a precise auto-cut off system and a long float charging sessions. You will find many related designs in the adjoining link.

48 V Battery Charger

48V batteries are more robust than the above mentioned batteries and are used only where awesome amount of power is required. It is used in huge solar inverters, GTI or grid tie inverters, and also in inverters which require very long backup operations. To charge a 48V battery you will need to make sure that the output from the charger must be at least 55V rated, and the battery must be charged with a 3 step charging process quite identical to the other lead acid variants.

PWM Battery Charger

PWM based charging concept is a relatively modern concept which is used for charging battery through digital and using pulse width modulation. Here the charging process is controlled by varying the voltage pulses to the battery. Since no analogue system is involved PWM chargers are very efficient and dissipate minimum electricity in the form of heat. In this website I have published a good number of PWM based charger which anybody can grasp and build at home.

IC 555 Battery Charger s

As we all know that IC 741 is an opamp IC which has been so far used for implementing many useful ideas. In this website you will find that this versatile IC has been smartly applied as a comparator in most battery charger for enabling an automatic full charge cut-off and low discharge restoration implementation. Using a comparator IC allows your battery charging to be entirely safe and ideally suited for charging any battery safely. More can be learned from the attached link.
Just like IC 741, IC 555 is another versatile chip which can be effectively used for making battery charger s. I have presented a few battery chargers using IC 555 which also features an automatic cut off as soon as the battery is fully charged.

Arduino Battery Charger

Arduino is a microcontroller concept for designing extremely efficient and state-of-the-art battery charger designs. In this site I have introduced the most modern battery charging technology using Arduino for ensuring the best possible charging implementation for your battery using this highly advanced.

MPPT Battery Charger s

Any electronic hobbyist will know the importance of having a LM317 chip in his electronic goods box, because this IC can do some wonderful jobs when it comes to voltage regulation procedures. A battery charger basically requires a good voltage regulation while charging and this IC makes sure that it gives its best while implementing a safe regulated supply within a battery charger. In this website you will a handful of selected LM317 based battery charger with current control facility.

LM338 Battery Charger

LM338 is the big brother of LM317 and is identically versatile, and greatly suited for making constant current and constant voltage battery charger s, with one added feature. This feature is its high current specifications which makes it even more special than LM317. LM338 van deliver a good 5 amp current therefore becomes suitable for charging batteries upto 50 Ah rating. You will come across many good LM338 based battery charger in this website.

Multi-purpose Battery Charger

An automatic charger refers to a design which may be equipped with all the necessary features required for a comprehensive and safe battery charging procedure, such as supplying CC/CV to the battery and an auto-cut for both the high and lower thresholds of the battery. A good range of automatic battery charger has been included in this website for your specific battery charging requirement and specs.

Opamp Battery Charger

In the above discussion we learned how an opamp IC 741 can be used in battery chargerfor implementing a safe auto cut-off. In this blog you will find many such alternate designs using one opamp and sometimes two opamps for maintaining the required auto cut off action in the most efficient way. Other than IC 741 you will also find see how other variants such as IC LM321, LM358, LM324 etc are used as effectively for implementing automatic battery chargers.

Solar Battery Chargers

Solar power harnessing is becoming more and more popular and highly sought after technology today. When it comes to solar energy harnessing and solar power accumulation, charging battery effectively becomes an inherent part of the entire system. In this website I have designed many exclusive solar battery charger s, and MPPT charging concepts which can be used for charging batteries using solar panel at the most efficient way.

Simple Battery Charge

Although battery charging concept normally requires complex steps and procedures for ensuring maximum benefit for the battery and the user, simple battery chargers with bare minimum facilities can be also used for charging batteries as safely. However since these are not equipped with advanced ry the charging efficiency might be a little compromised wherein the batteries may not charge upto the optimal levels. A few transistorized simple battery chargers have been included in the above link, specially suited for the young school electronic enthusiasts.

Li-Ion Battery Chargers

We have discussed the term constant current and constant voltage in the above sections. Basically these mean that the current supply and the voltage supply from the specific charger must be controlled and not allowed to exceed the stipulated safe limits of the connected battery. These parameters become crucial mostly for the Li-ion batteries and require strict implementation with these features. In this website you will be able to find elaborate designs explaining CC/CV based battery chargers for your individual application needs.
Li-ion batteries are special type of batteries which are designed to produce maximum efficiency in the form of quick charging, long backups, along with huge number charging/discharging cycles. Being so efficient also means that these batteries will require an equally sophisticated charging system. In this website I have furnished a handful of good Li-ion battery charger which are cheap yet include all the necessary advanced features such as constant current, contact voltage and auto cut-off features with automatic temperature sensing and current sensing trip off facilities.

Universal Battery Chargers

A universal battery charger must have all the features in it which can make it universally applicable for charging all types of batteries, such as lead acid battery, Ni-Cd battery, SMF battery and also Li-ion battery. To meet these crucial criteria a universal charger must have all the settings which can be applied for a given battery charging specifications, and must be user friendly also. In this website I have designed a few good universal and smart battery charger which are truly universal, as its name suggests.

MORE CIRCUITS AVAILABLE HERE




    Need Help? Please leave a comment, I'll get back soon with a reply!

    Comments

    1. Hello Mr Swagatam I am a member and a keen follower.I use this unit to backup my laptop but it is bad Can you help me with the circuit that will charge these battery. It has the following labels
      Model:TH-68110146
      working voltage-11.1volt
      Capacity- 33.6A
      Power-373W
      The battery has 48 pcs of cells. It has four wire coming out and is labeled with the following output voltages
      red black wire= 11.5v
      yellow black= 3.8v
      green black= 7.7v
      The request here is, I need the circuit that will charge the cells, the main charging circuit of the unit has burnt beyond repairs but the cells are good

      ReplyDelete
      Replies
      1. Hi Rabiu,

        Would be able to find the AH ratings of the individual cells, otherwise it would be difficult to figure out the safe charge levels for them..

        Delete
      2. ....i mean, please find out the AH ratings for the different cells, that would help me to design a correctly dimensioned supplies for them

        Delete
    2. Hi Swagatam

      First of all, kindly increase the headings of your blog.

      Secondly, all the members/followers should post their comments/requirements/questions under related heading. This will enable to look for a specific post easily.

      My question......Suppose a project needs three different voltages, say 24V, 9V and 3V. If we have a 24v supply, we can get 9V/3V thru V/Reg ICs or thru 2 sets of potential divider. I just want to know which of these two approaches is more practical and why? What are the disadvantages of the other.

      ReplyDelete
      Replies
      1. Hi Abu-Hafss,

        I agree with your suggestion, I'll do it as soon as I get some free time.

        As far as your question goes, a voltage divider is used with inputs where the current requirement is negligibly small, because a voltage divider would provide current in mA.

        Whereas a 78XX type regulator would provide voltage regulation along with high magnitudes of current....so it depends on the application needs and conditions, if it's low current then a voltage divider would work otherwise it's better to go for standard VR chips.

        Delete
      2. Okay, understood.

        And when do we use a zener for voltage regulation in contrast to a 78XX regulator?

        Delete
      3. zener may be used for achieving low current constant voltage references.

        Delete
    3. hi sir,...

      like this

      help me send cicuit pcb and layout?

      thanks sir

      ReplyDelete
    4. Hi Swagatam

      I want to share the strange behavior of a power supply circuit which I assembled from scrap components.

      Transformer 220v >>> 24v (100-200mA)
      Rectifiers 1N4007
      Capacitor 3300µF/30V and 2200µF/35V

      The transformer output is showing 23VAC.
      After rectification, if 3300µF/30V is connected, I get 33VDC.
      And if 2200µF/35V is connected, I get more than 36VDC.

      How can we get more voltages than the output of the transformer?

      ReplyDelete
      Replies
      1. Hi Abu-Hafss,

        As you may be knowing that the AC when measured shows the RMS value, once it gets rectified and a filter cap is connected, the stored charge compensates the ripple gaps and also the exponential nature of the vlotage, and generates a voltage almost equal to the input peak voltage, and that's the reason for the increased voltage at the output.

        Delete
      2. Hi Swagatam

        I think you mistook the output voltage.

        The input peak voltage is 23V (before rectification)
        and the output is 33V or 37V (after rectification/filtration).

        Delete
      3. I am getting more than 30v instead of 24v.

        Do I need to deploy a 24 zener ?

        Delete
      4. Hi Abu-Hafss,

        The 23V is the RMS value or the average value, not the peak value...

        Delete
      5. ...a 7824 IC would be a better option.

        Delete
    5. Need a simple circuit in parallel with a battery charger and a 12v battery to indicate when the battery charger is "on". Thus, a circuit in parallel with a battery charger and a battery which will light an LED (7ma 1.9V) when the voltage exceeds 13.5 or so. Maximum voltage from the charger is 18V.

      ReplyDelete
      Replies
      1. you can try the first circuit from this article:

        http://homemadecircuitsandschematics.blogspot.in/2011/12/how-to-make-simple-low-battery-voltage.html

        Swap pin3 and pin2 positions of the IC with each other.

        Apply 13.5V and adjust the preset such that the LED just lights up at 13.5V.

        Delete
      2. Thanks so much. I'll give it a try.

        Delete
      3. Back again - would a Microchip TC54 also work and require less components?

        Delete
      4. may be it can be used, although i am not sure how it can be used with 14V supplies?

        Delete
      5. Ok, thanks for your comment. Unless you can suggest a schematic, I'll proceed with the 741.
        Thanks again.

        Delete
    6. Dear sir, I've read about the Supercapacitor by the teenage girl in the internet, is there any simple diy to make a phone charger with it.? and what is your comment/suggestion regarding these if any.. thank you

      ReplyDelete
      Replies
      1. Dear Kaunisiapa,

        I'll do some research about it and try to revert soon.

        Delete
      2. hello sir would you plz advise me a circuit to charge 3 4v batteries connected in series ( giving 12 v ) with a 3-5 volt charger I m new to electronics!!!!

        Delete
      3. hello Mujahid, you will need a boost circuit for that. Please Goggle "IC555 boost charger circuit" and you can use it with your 5V charer to get a 12V output

        Delete
    7. Hi Swagatam,

      I am recent follower of your posts and its very impressive.

      As a part of my mini project I need to convert a "Water bath heater" powered by a 12v/5A supply to a rechargeable battery system supply. Is this possible?

      Hope you hear from you soon,

      Thank you.

      ReplyDelete
      Replies
      1. Hi Jithin,

        you can use a 12V smf battery for powering the heater directly, the AH rating can be anywhere from 10AH to 200AH....AH rating will decide the backup time only, and will not create any safety issues as long as the battery voltage matches the load voltage (heater voltage).

        Delete
    8. hi swagatam, i recently bought a UPS battery which is 12v 7AH lead acid for my robot. Now i want a charger for that. I don't want an automatic charger, just a simple charger with an indicator to show that the battery is full......Also the input should be from 220v wall outlet. do you have a circuit for that.....??

      ReplyDelete
      Replies
      1. Hi Himanshu,

        You can simply charge it through a 12V/1amp transformer after rectifying and filtering the voltage with a bridge rectifier and a capacitor.
        For indication use a 1amp ammeter in series with the positive connection of the power supply with the battery.

        Initially the meter will show full deflection, as the battery is charged the deflection will slowly move toward zero and finally settle to zero once the battery attains a full charge.

        Delete
      2. As you told me i bought a 12v/1amp transformer but it gives me 14v as output and after rectifying it i get 19v as output. i am using 1N4007 diodes and a 1000uF capacitor to rectify the voltage. Can i still use this circuit to charge my battery. If not please suggest any changes.

        Delete
      3. it should show 12V or 12.5V max, if it's showing 14V either the trafo is not wound correctly or your mains has above 250V input.

        after rectification it must reach not above 16V.

        but anyway you can use it for your 12v 7ah, it would drop to the correct level automatically.

        Delete
    9. hello sir!..i need your help please. i got a project to do as my assignment..my project is a simple buck converter. the problem is i use n-ch mosfet irf640, i simulated it in proteus. it worked well, but when i test it on breadboard i got a low output voltage. my power supply is 30v, and output is varried according to dutycycle from arduino, frequency is 100khz. i try to use resistor from 1k to 10k at gate pin to ground, and try to change the frequency from 1k to 100khz, i use inductor 100uh, and 100uf as current and voltage filter.. i got only 4-5v max output voltage at fully duty cycle, 0.2-0.7v at zero duty cycle. it seem that mosfet is not fully on or off. but when i tauch my figer on gate pin i got fully output voltage. even i leave gate unconnected. it is still no zero.. please can u help me?

      ReplyDelete
      Replies
      1. hello seok, with a digital multimeter check the voltage at the gate of the mosfet, and also check frequency at that point....let me know about these, I will try to figure out the fault.

        Delete
    10. thank u sir! for your reply..as i measured it..it is the same to the output of pwm from the arduino(around 5v at 100%duty cycle) the frequency i use is 100khz. i have tried to vary the frequency but the result is the same.. n i try to replace pwm from my arduino by using pwm generator. but the result is still the same.

      ReplyDelete
      Replies
      1. Try using BJT stage in between the arduino output and the mosfet gate, this will enable amplifying the 5V to 12V(supply) and help the mosfets to conduct more current.

        I hope you know how to configure this?

        Delete
    11. i try to use with other fet or two transistor as dalington, or transister with fet. the result is the same..i was very wonder.. sir! can u implement a work buck converter circuit for me with input 30v 3a f=100khz with any switch for me..i m tired to test my circuit again and again..

      ReplyDelete
      Replies
      1. you can try the following design:

        http://homemadecircuitsandschematics.blogspot.in/2014/06/solar-panel-buck-converter-circuit-with.html

        Delete
      2. sir, I have a 20v DC supply. I need a 5v 3A DC from it. can i obtain this with LM7805 and pass transistor? or is there any other way to get 5v 3A ? pls help me

        Delete
      3. Sreekumar, yes it's the easiest way to go, using a 7805 IC with an outboard BJT to support the extra amps.

        More details can be found here:

        http://easy-electronic-circuits.blogspot.in/2012/03/deriving-high-current-from-7805-7812.html

        Delete
    12. good day sir,
      I need a portable rechargeable battery that capable of generating around 100-120 w sir, do you have an available circuit for that sir? or can you suggest a schematic diagram for it sir. Thank you so much sir I just need it for my project at school sir :)

      ReplyDelete
      Replies
      1. good day Leen, you can try the second circuit shown in the following link:

        http://homemadecircuitsandschematics.blogspot.in/2011/12/how-to-make-simple-low-battery-voltage.html

        Use any battery as per your specs in the design and enclose the system inside a box for completing the design. The input will need to be integrated via a suitable SMPS adapter unit.

        Delete
    13. Hi sir, can u please provide a circuit in order to charge 4 li-ion batteries in series using multi stage CONSTANT CURRENT source?

      ReplyDelete
      Replies
      1. Hi Tom,

        You can use the second circuit from this article for your need:

        http://homemadecircuitsandschematics.blogspot.in/2012/07/make-6v-4ah-automatic-battery-charger.html

        Delete
    14. Well done sir, I made this circuit for charging my 45AH lead acid battery but its output doesn't go up to 14V instead it stpps at 13.4V when varying the 10K pot so I don't know the problem, is it the 1K resistor on series with the 10K pot or not? because when I measure the EMF of the at around 6pm, I only get 12V alway everyday not 13.V ,thanks.

      ReplyDelete
      Replies
      1. thanks kakooza, use a 22k pot and check the results

        Delete
    15. sir i would like to make an auto turn of cellphone charger with 220v input and 5v .7mA output any suggestions?

      ReplyDelete
    16. hi sir, i have a project and i need to make an auto cut off cellphone charger with input 220v and an output of 5v .750mA any suggestions?

      ReplyDelete
    17. hi swagatam i found this circuit. please help me what changes i should do to make this to have an input of 220v 60hertz and an output of 5v and 700mA

      ReplyDelete
      Replies
      1. Hi hannah, you can use a standard 12V AC/DC adapter and use the second circuit from the following link with it:

        http://www.homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html

        the shown battery points can be then used for charging the cell phone with an auto cut off feature


        by the way all celi phones have an in-built sophisticated auto-cut off circuitry...so an external feature is just unnecessary.

        Delete
      2. Hi Swa. Is necessary to have a battery on continuous trickle charge the entire day. Would once a day suffice or is this not good for the life of the battery.
        I'm thinking on the the Line of having the inverter switched off during the day only coming on at predetermined times to avoid it working during the day when we do not require backup power.
        Thank U.

        Delete
      3. Also the inverter does not charge higher than 13.62v . For a 12v 102ah deep cycle battery should it be brought to 14v which I've read is the fully charged state. The battery is reading 12.63v.
        Thank u

        Delete
      4. Trickle charge is necessary only if the battery is left unattended for a long period of time otherwise it's not necessary.

        if the battery is not charging above 13.6V the problem could be in the charger voltage setting or may the battery is damaged internally and not accepting optimal charge, it can be either of the two.

        once the charger input is removed, the battery voltage will eventually settle down to around 13V, even if it's been charged at the 14V level.

        Delete
    18. Hello friend,
      I want simple 3.7v 2000 or 2000 and above ma battery charger circuit with auto full charge cutoff, with led indicator circuit. bcoz I am using now 3.7v battery charger circuit(circuit from 18650 power bank circuit) but its taking too much time to recharge my battery ex: more then 5hrs. I want to charge my battery within 2hrs. Thank you.

      ReplyDelete
      Replies
      1. Hello friend, you can try any of the circuits presented in the following article:

        http://www.homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html

        make sure to adjust the voltage to 4.2V for your application

        Delete
    19. Hello sir I need a simple automatic AVR for a diesel generator
      It is used to operate 4 fuel pumps on a refill station but now the one we use is weak & now operates two low power pumps, just help sir, thanks.

      ReplyDelete
      Replies
      1. Kakooza, please provide a detailed info regarding your requirement....

        Delete
    20. Hello Sir, your website is truly a pleasure to read and thank you for publishing your work. I am building a charger for a electric scooter with lifepo4 battery system. The charger is rated between 52-54V and able to output up to 10A of current. Do you have any suggestions? Thank you sir.

      ReplyDelete
      Replies
      1. Thanks Jon, I think you can try the first circuit from the following article, it will suit your application need:

        http://www.homemade-circuits.com/2012/08/make-this-48v-automatic-battery-charger.html

        Delete
      2. Thank you for the sir. Thanks again for posting your work!

        Delete
    21. sir iam john i really very interested in electronics so that i need your help about my final year project about the circuit diagram and its detail of detection of brocken conductor for overhead lines and i tried to do it but somehow post from Tanzania

      ReplyDelete
      Replies
      1. You can try the following design and modify it accordingly for your application need:

        http://www.homemade-circuits.com/2011/12/how-to-make-non-contact-ac-mains-phase.html

        Delete
    22. hi sir, recently my UPS battery 12V 7AH died on me, its bcoz we get sub-standard battery quality here, now i have got a lot of Li-ion batteries i.e. 18650, with me; is it possible that i can charge these 3x18650 combined in series and used as UPS battery? also can i use the UPS battery charger to charge the 18650 battery; if not i need to build another circuit for these battery. thanks in advance.

      ReplyDelete
      Replies
      1. Hi Tom, you can replace it without doing any change, there's no harm in doing so....but is the AH rating of the Li-ion batts 7AH? otherwise the back up time of the UPS might get affected

        Delete
    23. Hi sir can you explain, cpu ATX power supply to charging automobile battery

      ReplyDelete
    24. hi hello mr. swagatam im here again..can ask again? sir I have made a power bank, my project was working but the problem is the percentage of my batt is not increasing. what do you think is the problem sir? I am using a 9 pcs.of batt in series..batt. name EXL Ni-MH AA1500mAh 1.2V

      ReplyDelete
      Replies
      1. Hi Mark, which battery did you charge with your power bank? please remember that the client battery should have much lower AH and voltage specs than the master battery for getting optimally charged.

        Delete
    25. Good Day Mr Genius. please I need your help on one of my power supply. I need a circuit for step down transformerless 220VAC to 110VAC. Thanks a million.

      ReplyDelete
      Replies
      1. Good day Elvis, sorry that is just not possible.

        Delete
    26. hello sir, i need a Li-MH circuit for charging AA and AAA cells with all kinds of indicator circuit and for safe use by any one please help me in suggesting it ..

      ReplyDelete
      Replies
      1. Hello Virendra,

        you can try the second circuit from this link

        http://www.homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html

        Delete
    27. hi sir,
      i have dynamo and it is powered by a mechanisms when a car goes over it. the dynamo produced a max of output voltage of 25v. i want to use this output voltage to charge a 12v car battery and simultaneously give to a power inverter to power some appliances. sir can this be achieved and what is the circuit for the same??

      ReplyDelete
      Replies
      1. Shramik, you can try the following circuit

        http://www.homemade-circuits.com/2014/05/generating-electricity-from-road-speed.html

        Delete
      2. thank you so much sir,
        sir once the battery is charged can i use the battery simultaneously for powering a power inverter??

        Delete
      3. yes that's possible, but only after the battery is fully charged

        Delete
      4. sir
        but how to ensure that only the battery is powering the inverter and not the dynamo??
        as i want the battery to continuously power the inverter output and simultaneously the dynamo should charge the battery.

        Delete
      5. Sharmik, you will need to employ a relay changeover stage which should be designed to trigger in the inverter mode as soon as the battery is fully charged.

        Delete
      6. sir,
        can i get full circuit for my project.
        in which the dynamo charges the battery and as soon as the battery is full the inverter can be turned on.
        also sir, is there any way i can keep my inveter on all the time either from the battery or the dynamo?

        Delete
      7. Shramik, you can try the second circuit from this article

        http://www.homemade-circuits.com/2011/12/how-to-make-simple-low-battery-voltage.html

        connect the inverter positive supply with the N/O of the relay and the negative with the battery negative.

        Delete
      8. thank you sir,
        but this circuit will only turn power inverter on when the battery is fully charged??
        sir my project is such that, the inverter should be on continuously whether the dynamo is running or not.
        sir this can be done by a circuit in which, the power inverter is powered most of the time by dynamo and also dynamo simultaneously charges the battery and when the dynamo is not running, power inverter input switches to battery output
        so first a circuit which charges a battery.
        second a circuit which powers the inverter through the dynamo.
        third a circuit which switches the power inverter input between dynamo output and battery output.

        Delete
      9. In that case you can try the following circuit

        http://www.homemade-circuits.com/2013/03/simple-dc-ups-circuit-for-modemrouter.html

        or you can also try the following concepts

        http://www.homemade-circuits.com/2015/11/redundant-ups-circuit.html

        here the 14V input could be replaced with battery, the "alternative power" with dynamo and the N/O contact of the relay should be joined with D2 cathode.

        Delete
    28. Sir,
      I own a lenovo laptop,its adapter(65W 19v 3.42A) has gone bad(it can power the laptop but could not charge the battery).On travelling in train it often damages the power board present in the coach when connected.What could be the cause?On opening the adapter case and seeing pcb all seems ok.I thought that the capacitors could be faulty but on seeing it ,it seems ok.What could be the cause.

      ReplyDelete
      Replies
      1. Nishant, if it is damaging the board then definitely it is not OK....you should check the voltage with a meter to confirm its condition....
        you are saying it's not supplying enough current for the laptop and for charging the battery, that is contradicting your second statement....because if it is not capable of supplying or drawing sufficient current then it shouldn't be capable of damaging the board either?

        a proper analysis using a DMM will be required to confirm its actual status...

        Delete
    29. Hi Swagatam, it is I again calling on your expertise. Which of all the battery charger circuits that you have on your site would you recommend to use for charging 12V 7.2Ah SLA batteries.
      Regards
      Geoff

      ReplyDelete
      Replies
      1. Hi Geoff, you can try the last circuit from the following article:

        http://www.homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html

        Delete
      2. http://www.homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html

        Delete
    30. Hai sir,
      U helping me lot sir....

      Few doubts in indicator method...
      I'm using 12 7ah battery ....
      If the battery voltage 11v will come..the led will indicate and buzzer will make sound....
      Circuit I'm using
      Bc547 2
      1k resistor 2
      11v zener 1
      11v zener cathode connected in battery + side..anode connected in 1k resistor...1k resistor connected in transistor base,, emitter negaive,,,
      2 transistor emitter negative ,collector led,,,base is connected with 1k resistor in postive ...now the 1transistor collector directly connected to 2transistor base...
      Circuit is working well...
      But prblm is when voltage 12.20 itself indicating low...
      What i want to do...
      I need to change
      Resistor value ?
      Zener value ?
      ....
      When 11v reaches the led need to indiacte sir..
      Pls guide me sir

      ReplyDelete
      Replies
      1. Kesava, you can try connecting a 10K preset across base emitter of the tramsistor and adjust this preset to achieve the required threshold indication.

        Delete
    31. Hello Swagatam Majumdar, good afternoon to you and how's your end so far?
      Please i need your help and i have been following you for some time now, please i want to create a battery charger for 12v 200ah battery and 24v 200ah battery charger, with low voltage and high voltage cut off circuit. I've tried some of you circuit i saw on your blog but some how, i guess i was just lucky to build a charger but the low voltage and high voltage cutoff part is not working as perfectly as i want, please is there any help you can render to me with the circuit or where you can refer me to.
      Thanks for your help in advance Joshua

      ReplyDelete
      Replies
      1. Hello joshua, if you learn how to adjust an opamp comparator then it would be matter just 2 minutes to get the adjustments done accurately for the mentioned battery charger circuits, however the results will also largely depend on the quality of the parts, especially the opamp and the presets....if these are not good then the results might get severely affected.

        I can suggest you a couple of articles which you can try, these are easier to set than the usual single opamp circuits:

        http://www.homemade-circuits.com/2017/01/universal-battery-charger-circuit.html

        http://www.homemade-circuits.com/2016/05/opamp-low-high-battery-charger.html

        let me know if you have any difficulty with these concepts...

        Delete
    32. Hello Sir:)
      Im an electronics fan,whising to ask u for help according this circuit:( Short 4A 5A 2S Lithium Iron Phosphate Battery Charger Protection Board 7.4V 8.4V Current Overcharge Li-ion Battery BMS)
      This is from Aliexpress and i want to modify by raising his amperage to 25-30A.
      Got some high end mosfets but i cannt figure out how to change the resistors to fit for the 25A load

      Best regards

      Yours A Istvan from Romania

      ReplyDelete
      Replies
      1. Hello Istvan, you can replicate the existing mosfet stage and connect them in parallel with each other...this will quickly modify the design with added current

        Delete
    33. got these fets:IRFZ44N,IRLR7843PBF,IRL3713PBF and TVS diode 15v like SMBJ15A

      Regards
      A Istvan

      ReplyDelete
      Replies
      1. You can use IRFZ44N, in parallel with the existing mosfet...make sure to put similar resistors as used for the existing mosfet

        Delete
    34. It looks easy but i hawe some doubts.
      This circuit its supposed to have overcurrent protection so it must be an sensing element in the circut.Maybe the copper board donno.i cannt find an lil resistor.
      If it has overcurrent protection that must too upgraded.
      And paralelling an 55A fet with those craps ....donno:))
      Ill try to print the boards picture.Btw sorry my english,not my birth language:)

      ReplyDelete
      Replies
      1. sorry that would be difficult to diagnose, it will need to be thoroughly checked and understood if there are so many parameters.

        Delete
    35. hi sir,
      i want to build a hydro generator which charges a 12v battery.
      but the flow of water is bidirectional. so the dc generator should be able to produce same polarity dc even when the water direction is reversed.
      is this possible?
      thank you

      ReplyDelete
      Replies
      1. Hi Sharmik, you just have to employ a bridge rectifier at the output of the motor that will take care of the bi-directional voltage from the motor and produce a single poled supply output

        Delete
      2. thank you for the reply sir,
        sir can do you have a circuit in which i can charge a 12v battery from the 24v dc generator(including the full wave bridge rectifer)

        Delete
      3. shramik, you can try the last circuit from the following article

        http://www.homemade-circuits.com/2013/04/solar-water-heater-with-battery-charger.html

        Delete
    36. thx anyway,got another idea to protect my batteries:)
      ill try to use an lipo beeper where the voltage applied to beeper reversed vith an tranzistor vill shut down an big fet.=>hopefully works:P
      the lipo beeper is programabble to allert when the cells voltage drops below a specified value.
      All these bcoz i didnt find any ready made circuit at reasonable price who handles 30A and protect my batteries from excessive discharge:(

      ReplyDelete
      Replies
      1. OK that will do!

        By the way for a 30 amp charger you can easily make the one which is shown in the following article

        http://www.homemade-circuits.com/2011/12/high-current-10-to-20-amp-automatic.html

        Delete
    37. trying to make some battery packs for my sons airsoft weapons with reasonable protection.
      Atm its none with cut of protection at excessive dischagre(that damages the cell badly).
      Gharging them i use IMAX B6 inteli charger.

      ReplyDelete
      Replies
      1. you can use any simple 741 based charger for the purpose I have published many automatic chargers which will do this job efficiently

        Delete

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