I see. One pack at a time would only be usable for low speed operation.
Using big diodes to put packs in parallel might work, but you'd lose a lot of energy due to the voltage drop over the diodes. Their rated voltage doesn't matter much - it's the current that affects the voltage drop when they conduct, and that could be up to 1V at 30A = 30W dissipated as heat per diode.
Another issue is that the packs might not share the load equally, depending on their state of charge. I don't know if this is a problem or not. LFP tend to hold a steady voltage through most of their SOC range, so this issue shouldn't be nearly as bad as with lead-acid batteries.
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Posted by: cpcanoesailor@yahoo.ca
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