Highest recommended voltage drop range to pair up modules?

vallesj · Aug 1, 2024 at 3:28 PM

GaryInSanDiego said: ↑

The max load on the whole pack is about 100 amps. This value divided by 28 modules is about 4 amps. So applying a load of 20 amps seems way too strong, and the modules may perform differently than if a 4 amp load is applied.

One headlamp is 3.5 amps and an IKEA 12 V 20 W halogen is 1.5 amps. I used these in parallel with a load test, which provided a little less than 5 amps. A 3.5 amp load may be a normal load.

I suggest charging the batteries up to 8.25 volts and let them drift down to 8.10 volts. Then do a load test with 3.5 - 5 amps for 2 minutes. This should give you a good idea of which batteries are stronger. I suggest testing this higher range because I noticed my modules many times are charged up to 8.59 volts, which is where the Delta V drops, preventing the battery from being charged higher than this.

Replacing the modules that have more of a voltage drop seems like a good strategy to weed out the bad modules.
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Where did you get that the pack max amp is 100A? As other commented, since these are in series, the total max amperage is the same as the amperage the weakest module can give.

Highest recommended voltage drop range to pair up modules?

vallesj Junior Member

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Highest recommended voltage drop range to pair up modules?

vallesj Junior Member