Going with a 4s packs.
All cellstested with an Opus 3100. Only using cells that are 1.7Ah or above. Stripping off existing shrink wrap and replacing. After grouping the cells, complete batteries will have a working output voltage range of 16.8 to 11.2. Going with 5amp fuse wire and solid6ga copper for the bus bar. No balancing.
Proof of concept has been created as a single pack just to ensure programming compatibility with the inverter/charger. No high voltage cut-out, will invert above 16v and all the way down.All systems are go.
With a fully programmable inverter/charger that doesn't have an overvoltage disconnect until 17v, I don't understandwhy don't more people use 4s vs. 3s to optimize their battery capacity.