ksmithaz1
Solar / EV Junkie
Since we were talking about running 12's in series . . . The argument becomes 16x3v vs 4x12v. Assuming LP4 3.2v 13v, whatever for a 51.2v final voltage. Keep in mind the 12's are just a 4x3v in a box with a BMS.I can't imagine suggesting to someone who is trying to get a modest size / beginner project done in a reasonable amount of time, that they should also go through the PITA to build their own battery from misc imported parts. Maybe project #3, but project #1 ?
1 BMS vs 4 in series with their own idea of what they need.
RE: shipping, a single 3.2 is not as heavy as a 12.
Single 51.2v 100AH rack unit is 16x3v inside, pop the cover and replace /return the bad cell.
DIY is much cheaper but requires a modicum of patience you might not have as pretty or convenient a box.
A lot less wiring and connecting on a single 51.2v 100AH rack unit, 2-#4 cables in open air to whatever bus.
I think the point is in for a penny, in for a pound. If you are willing to wire up 4 12v in series, now you have to find/build and/or buy the interconnect cabling, and come up with a box or shelf to put them on. Why not just go the extra mile and string 16 3's with the provided bus hardware, and slap a BMS on the side of the box. You only add the 16 sense/charge wires and the power cables to the BMS.