Lead Acid Battery Balancer

Projects General Guidance
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Hi, Guys
I am looking for Lead Acid Battery Balancer 48V

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the acid solution is a natural balancer, it boils while overcharge. you add then water if needed.

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looking for Equalizer circuit diagram

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Series lead acid battery packs with equivalent cells do not need balancing.

Read up on charging lead acid batteries here:

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The link you provided states:
Aging batteries pose a challenge when setting the float charge voltage because each cell has its own unique condition. Connected in a string, all cells receive the same charge current and controlling individual cell voltages as each reaches full capacity is almost impossible. Weak cells may go into overcharge while strong cells remain in a starved state. A float current that is too high for the faded cell might sulfate the strong neighbor due to undercharge. Cell-balancing devices are available compensate for the differences in voltages caused by cell imbalance.

My own experience with 24v systems (2x12v) active balancing avoids overcharging caused by imbalance and increases lifespan of the stack.

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Is the stack 4x12v or 2x24v? I've got schematics and Gerber files I've drawn up in EasyEDA for 24v active balancers. I've used these with good results (discrete components, no microcontroller). Two of these could be used on a 4x12, 48v stack. I get circuit boards made up and put them together myself but balancers are readily available online these days with more features. I may get around to doing an mcu version some day.

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Maybe 8 x 6 volt batteries? Golf cart?

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Yes, of course. Those are not equivalent cells.

None of the commercial, heavy duty 48V lead acid systems I have worked with, for about 7 years now on a nearly daily basis, use balancing chargers. But I do not doubt that some benefit would accrue from balancing chargers, as the batteries die.

I suspect that most people just replace the cells as their performance drops significantly (as I have done).

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Yeah, the bulk of my battery experience has been on large generators with 24v for starting. Those big battery packs are expensive and we always noticed that there would be one that failed from boiling dry due to overcharging, while others were undercharged. I got some active balancers made up and we started keeping the stack balanced whenever new batteries were installed. I'd guesstimate that our battery life increased by at least 25%.

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That is good for 4 cells not multiple cell batteries.

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Features
  • Single IC Balances Up to Four 12V Lead-Acid Batteries in Series
  • All NFET Design
  • Stackable to Balance Larger Series Battery Packs
  • Standalone Balancing Operation:
    • Requires No External μP or Additional Control Circuitry
  • Balancing Current Limited by External PTC Thermistor
  • Continuous Mode and Timer Mode
  • Programmable UV and OV Fault Thresholds
  • Programmable Termination Time and Termination Voltage
  • Thermally Enhanced 38-Lead TSSOP Package
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Keep in mind that a "12V" lead acid battery is already comprised of six individual 2V lead acid cells in series, which have no charge balancers.

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