Alternatively you could quit using fets and try BJT such as TIP142 for making things much easier. Adeyemi, for 12V the full charge level is 14.2V, so for 24V it should be 28.4V, so at 27.6V the battery will be only 60% charged, no aut cut off will be required, and its fine to use it, although with compromised back up. So I have been looking for ways to maybe make m own charger . 125 F, or an AGM or GEL (valve regulated) battery over 100 F. The target voltage however the above set up would not give you an automatic cut, for that you will have to modify each individual circuit with additional parts as done in the following design: https://www.homemade-circuits.com/2012/02/how-to-build-automatic-6-volt-12-volt.html, Wow lol way to complicated for me the thing is if you look at how 4x12v batteries are wired up to get 48v if you joined something up to all the positive wires then used the earth surely at some point on the batteries you would be running positive strait to negative somewhere along the battery cables. Good day sir, please I saw a battery charger set at constant value of 27.6v for 24v system, will the battery be fully charged at this level, and is there need for auto cut off. In order to block the 2.2V and make it zero you can try adding a 3V zener in series with the gate of the mosfet. Source will go to the positive line. To extend the runtime of the batteries, you should connect them in parallel. i put some aligator clips on it and checked the polarity with a multimeter. Read a commentary on this article by Anoop Hegde: IfYou Build A Smart Battery Charger Using a Single-Transistor Circuit, Beware the Consequences. AC cannot be used as the voltage source. If it outputs 18 Volts that will not charge the battery pack because the battery pack is a 0% state of charge at 21 Volts. yes it will work, but the NPN, PNP and the fet will need to be upgraded at over 80V. Hi Sir, I am designing a charger for 48v, 210Ah Li-ion battery. next apply a 46V DC input and adjust the 22k preset to restore back power at the output, if it gives problems increase the preset value to 100K. Turn on the Charger - Once you have the voltmeter attached to your battery charger, turn on the charger to read the electrical output. Hello Shubham, what is current range of the charger, and do you want an auto cut off? These are one of the simplest chargers, which will provide perfect switch OFF at the full charge levels. Allegro MicroSystems. Hi Sir, After calculating the Rx value Im getting 5mOhm(Rx=0.6/110). make sure the voltage is as per the specs of the battery, otherwise you may quickly damage you battery with a mismatched input, for limiting current you can add a 24V truck head lamp in series or use the following concept, if your batt AH is within 50AH range, https://www.homemade-circuits.com/2013/06/universal-high-watt-led-current-limiter.html. The target voltage for a 48 volt charger for AGM or some flooded batteries is 2.4 to 2.45 volts per cell, which is 57.6 to 58.8 volts. Can you recommend a circuit that would achieve this? Yeah normally a 52V battery will work just fine with a 48V controller, usually the only issue is the battery level indicator on the LCD is incorrect. 2. I am not sure, but since it generates pulsed DC at 50Hz can be tried for the purpose. Our problem is when ever driver press throttle the battery voltage in battery level indicator fluctuate very much and then the car is stationary it doesnt. Complete with built-in BMS which monitors the state of charge via downstream resistance; this highly efficient, cost-effective 48V workhorse is optimized to push 18 amps at 95% efficiency making it one of the best value 48V lithium battery chargers on the market. VR2 is then adjusted so that it just turns off the transistor again. Yes the 0.6 value is the approximate full switch ON base voltage for the BC547, hai sir i want to use this circuit for 12v 17ah battery. You can determine the operating system voltage of your golf cart several ways. 1) It is BC556 2) you can put two IRF9540 in parallel. Can you make for me. What kind of diode did you use there? Please keep up the good work, Dear swagatam, Thanks for your valuable information,circuits and supports, I had wrote to you years of back and you had supported to me, Now again connecting to ask one doubt, I have a 5kV inverter transformer with 72 volts battery supply, Can you help me for the charging circuit with auto cut off the 80 volts charging taping is there. FREE delivery Wed, Jan 11 . The low voltage cut off is 44V, and the high cut off is 56V. Battery Pack Wiring Guide. You should use an Automatic battery charger circuit below. in the 1.3 to 12 amp hour range. My wifes 42V 2 amp charger works perfectly on her 42 V battery on the inverter. Morris, it is not about whether a square wave is used or a sine wave PWM is used, it used about how much average current the mosfets are able to deliver to the transformerthat decides the overall wattage capacity of the inverter. my problem is we have to monitor the charging process because the charger that comes with the unit is just an ordinary charger no auto cut-off no over charged protection etc. Referring to the second circuit from top, the BC547 has no chance of burning because its collector emitter is clamped and protected at 4.7V by the zener, and its base is almost connected to the ground via RX. Pls, enlighten me. Means 3 1ohm resistors in parallel do the job ? called "opportunity charging". tomar ei blog amader moto electronics premi manusher onek upokar e lagche. I have an older cordless vac where I just recently replaced all of the sub-c batteries that were failing (one group of 6 and another of group of 2). some cases). How To Connect 4 12V Batteries To Make 24V? The red and black points indicate the positive and negative terminals respectively. But, here is the therotical problem, when you connect the supply voltage(on second curcuit, where, it is printed as 52VDC) and battery(Where it is printed as per shematic), since supply voltage side is the sensing side, means, if my supply is, let's say 53VDC curcuit is just cut-off because supply is 53VDC and treshold was setted up 52VDC anything above 52VDC will trigger curcuit to OFF state, and if i reduce supply voltage to 51,5V then upper cut-off will never be utulize since supply voltage 51,5 always less than that of upper cut-off level 52VDC. i just wanna know is first circuit could detect low batter voltage ? way to charge a 48 volt battery bank is to use a 48 volt charger. 59V wont be a problem, because the second circuit preset will be adjusted to 57V, so it will anyhow cut off at 57V automatically, but make sure the input current is around 1/10th of the battery Ah or at the most be 1/5 Ah, how is the correct input voltage/amp for this 1st circuit, It will depend on the battery specs being used. You will need an SMPS circuit for that, as given in the following example: https://www.homemade-circuits.com/smps-2-x-50v-350w-circuit-for-audio/, Hell Mr Swagatam, I have a 48v / 25Amp Lead Acid battery charger for a Golf Cart. i would like to make a variable resistor controlled shut off . It will definitely work if you do as per the abve stated instructions. I dont remember about the modifications, since those comments were posted a long time ago. Not sure I will get notifications through this butbif not my email address is babyboyk@aol.com. And what diode can i use? rest all be as given , all resistor are 1/4 watt. But the charging supply of 15 V dc was connected to the circuit. Recharge time can be approximated by dividing the amp hours to be replaced by 90% yes it can, in the first circuit from the above article, the circuit will rapidly switch ON/OF when battery voltage reaches the set full charge threshold say 14V and drops to 13.9V.this gap can be increased to any desired value simply by adding a calculated resistor across the pin6 and pin2 of the IC, i want to build a cutoff circuit for 48v battery charger of battery 400ah please give me the component list, you can use one of the above designs, it will work. How to Resuscitate A Deeply Discharged AGM Battery? The pin#3 zener is protected by the 22K resistor so Its strange if it burns. This website uses cookies to improve your experience while you navigate through the website. When connecting the charger to the battery, it's important to make sure that the polarity is correct. Same circuit if I use 48 volt & 10Amp current then what will be the output voltage? You will have to convert it into DC through a bridge rectifier and use it. Hello sir, From the 48v circuit for battery charger, will it be possible to charge 4 12v baterries of 100ah in series? Video Clip showing the charging process using a single diode: I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. 2. Thank you very much for taking time to write a detailed answer. i other word can i use first circuit for a battery backup which is standby ? Some charger manufacturers Im assuming the Rx=0.6/(max current) is somehow derived from equations regarding the BC547? simple 1 transistor instead of mosfet right? Dear Suresh, The last diagram should be actually exactly as shown, nothing can be removed from that diagram. capacity (ah = amp hour capacity). Do Duracell Batteries Leak? (On sunday i could not manage but ill try again). For a 48V battery this would be around 57 V, which will make sure that the battery is cut off at its 80% charged state, which maybe slightly less than the optimal point, nevertheless will guarantee reduced stress and a longer life for the battery. Hello, yes you can use any of those opamps for making the above explained circuits. or 4 amp "smart charger" can be used for battery maintenance between higher amp cycle my question is, can i do, with this circuit 48V battery disconnect? controlled charger, to maintain battery capacity and service life. Make sure that the charger is rated for 48 volts. The properly BatteryMart.com offers charging solutions for all 48 volt charging needs. Connect the black alligator clip to negative lead of multi-meter and red alligator clip to positive lead. and also remove the 10k and zener at pin#7all these resistors were used to safeguard the IC from the high 48V source. An older 48 volt charger would feature a fixed charging voltage, high enough to Club Car 48 Volt for Golf Cart Battery Charger 5 amp - with 3 Pin Charge Plug. Very informative definately Ill add current control circuit in smps thank you.. 0.3 means 300milliohms right ? The slight over voltage will not affect the battery if the transformer current is rated at 10 to 15 times lower than the battery Ah. 3. thats perfect, If the green LED i getting OFF it means the opamp is correctly responding to the fully charge level, and the mosfet must also switch OFF in this state. you can use the last circuit as is shown, or alternatively try this one: Sir How can I used it to charge 24v battery And what I change in the circuit. I would like to have a little more clarification on this. My battery pack had been sitting for a few weeks so I knew they were week. And how long will it take to charge d above battery fully?3. Sometimes So we want such battery level indicator which do not fluctuate when throttle is applied and show battery percentage while driving the vehicle. For example if the battery AH is 20AH, the input must not be more than 3amps. It either improves the efficiency or enhances its backup time. this is setting up the upper cut of level. The one posted here is possibly the easiset with its concept and also is extremely easy to build. Can i find that in an old appliances? But the question is the green light always on even I vary the 22k.pls I nid ur help about the setup, Abdulnoni, disconnect the positive side of the green LED from the existing position and connect it with pin#7 of the IC..this will solve the issue but the illumination might decrease.to correct this decrease the pin#7 resistor to 4k7, and also decrease the LED resistor to 4k7.do this and check the response. A battery bank is a result of joining two or more batteries together for a single application. Thanks for your prompt reply. Thanks SwagatamWould it be hard to set this design up for 12 volts?Could the self regulating design be tweaked to shut off high and turn on low?CarlBTW where are you located? break or whatever), may keep the average depth of discharge above 50% for a service i have try N-channel and P-channel both. These are the "brilliant chargers", and quality. OK, I guess the only way the two groups could possibly be connected is in series, making the total voltage 9.6V, and thats why a 12V adapter is used. I have recently been given a PARSONS 4 IN 1 MULTI TOOLL I dont know how old it is or can I find any details of it , the previous owner tried to repair the charger then gave up on it , I want to know how to remake a charging circuit board for it the charger adapter is a AD-0514-BS1 with input 240v 50Hz 3W, Output is DC5.3v 140mA , the number of the circuit board is 600924D . here below what i have done. this circuit cannot be used for charging all types of batteries, for cel phone batteries you will need more complex designed as already explaimed in many of the posts in this blog. Both LEDs came on. How to Tell If A Lithium-Ion Battery Is Bad? $127.65 $ 127. Now the battery charger is set and ready to go. Higher capacity wet For To get higher current you will have to use a higher current power supply, theres no way to increase 52V 700mA to 52V 5 amps, thats just not possible. the diode can be connected to wire, it's not critical..but the transformer will need to be rated at 20 amp 15V minimum. Dear instructor, my name is Otunba Richard Olaniyi-Oshin from Nigeria. If the battery pack won't hold a charge, or the current does not drop for a 48 volt charger for AGM or some flooded batteries is 2.4 to 2.45 volts per cell, The idea is (with a 46/47V input) to make the pin3 voltage of the IC just higher than the pin2 voltage of the IC by tweaking the pin3 preset so that the output of the IC is forced to go high (RED LED ON), until this happens meaning as long as pin2 V is higher than pin3 V, the output stays low (green LED ON). This basically applies to battery applications where the average depth of good day sir i have a question can i use the yellow cable 12v inside power pack to charger 75ah battery and how may hours it will take it to charger it. These cookies do not store any personal information. presently I do not have, will try to update it soon. loose sulphation that may be on the plates. You have now plugged in your first pair . Will this ckt work for this purpose ?? Hi Sir, my battery is 4x12v 20ah (48v) what is the value of RX in my case? Equalization is essentially a controlled over charge. it is very strange. 6v 12v battery charger. I really commend you for your great work and interest. The reduction in the resistor values as mentioned by you is useful for the LED.. but it is not important for the MOSFET, since MOSFET gate has a high impedance so the current does not matter for the FET gate. Most older style golf cart battery chargers require approx 75% of the chargers operating voltage present to activate. Just follow the series connection process carefully. Some of the older God bless you. That means if the battery is 12V, the transformer should be 24V, and if the AH of the battery is 7.5 then dividing this by 10 gives 750mA which becomes therecommendedcharging rate of the battery,multiplyingthis by 2 gives 1.5Amps, so this becomes the required current rating of the transformer. I had to change out the rectifier for my source and now I am getting a 50 volt source for the circuit. Item # CHR-60V1.6AHS. Now adjust the preset until the LED just shuts off. I need automatic charging circuit.so will u please suggest which one I can use. (Charging at 83v). Is it safe to charge a battery at that rate? u know u are our lecturer thanks. correct me if Im wrong also where should i get this milliohm resistors i only have 1 ohm, Yes thats correct, you can use 3nos of 1 ohm in parallel. i have a regular charger with 60vdc output @ 2.8amp for ebike 48v 20ah, (4x12v). I would like to use a generator for battery charging only. So for example a 36 volt battery charger would require approx. No changes will be required for your application. I had set the #pin 2 as 4.7v without connecting the batteries and then i connected the battery pack. holding at the absorption voltage (between 57.6 VDC and 58.8 Most battery manufacturers recommend sizing the charger at about 25% of the battery I dont use simulators, because often they produce misleading results. Your circuit all set now. thanks. you can see 2 Potentiometer over the board (see the image) first one is voltage and second one is current. you can buy a 48V 7amp transformer and use a bridge rectifier and a 2200uF/100V filter capacitor for rectifying its output, this will provide you the required 56V/5 amp. A reading of about 36 amps is typical for a battery charger. Fast Delivery within the same day order . 4.3 4.3 out of 5 stars (2) $147.95 $ 147. A varied Rx between many different values and didnt observe any consistent changes in the current being fed to the battery pack. We use cookies on our website to give you the best experience. 3 in parallel can tried, just make sure to mount all the 3 of them over a single common heatsink. comparator part working superbly.there is no problem at all.3-) my trouble strated, when i try to switch OFF and ON the mossfet, first, i thought due to P-channel N-channel mosfet diffrence, but later, i realize that, its always ON regardless of the OPAMP condition(Low logic or High logic no difference,always ON due to same supply line of the source, meaning at 43V supply voltage, gate of the mossfet low logic, but Source of the mosfet 43V and drain also 43V and mosfett ON, at 47V gate is high logic 12V at the gate, source 47V and drain 47V,what ever the supply voltage mosfett is ON), when i try to increase output of the OPAMP to full suplly voltage,by this way gate would also receive full voltage (cancelling PN7 limitation) then mosfett started to act but not perfomed well as well.in order not danger curcuit, i asked you, you said, dont do it(but i did not check thoroughly increasing the output of the OPAMP, you said bad idea). (Weeks??) Assuming you have used the second circuit,You must do the setting up procedures by checking the voltages across input pins of the opamp.
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