Hello, been a long time reader/lurker but I'm now building my little off-grid house and have a question about charging individual cells.
I have fourteen 2v 110Ah cells which I'll be using in 2 paralleled strings of 6 series cells. This uses 12 cells which will be charged by my solar panels (2x85w) via a charge controller. I have 2 spare cells but I'm not sure how best to charge them to keep them topped up for whenever they might be needed in the future, either swap them into the strings every so often and rotate a different cell out each time, or is there a 2v charger I can find (or build) to keep them topped off as necessary.
I've not found any answers to this elsewhere. Is it possible to modify a regular 12v charger? I've looked at wallwart type power supplies and found some that output 3v but at about 0.5amp which I thought might be quite close to what was needed to at least trickle charge it.
I'd appreciate any suggestions you might have.
Many thanks,
Justin.
Moved to the proper section. TW