Just got done doing the first 'test' cycle and charge.
My math was wrong - these are 68 amp hour modules. Each individual LiPo cell has 68 Ah capacity and nominal 3.7 volts, so each module of 6 is 68 Ah and 48 volts. 4 modules in a series parallel arrangement gets 136 Ah capacity at 48 volts.
I took the Mate charge settings to the lowest possible point - 52.0v bulk and 48.0v absorb. Refloat and equalize are completely off.
Cells arrived with a 48.5 volt charge, which hasn't changed in the 60 days they've been sitting on the bench. Using an 18 amp charge rate, the bulk/constant current stage went up to 52 volts in only half an hour. The FX3648 then switched right over to the absorb/constant voltage stage and I watched the Mate as it dropped down, down, down. The fan kicked off at about 90% of charge and then it stopped with a final voltage of 52. The voltage has dropped by .5 volt in half an hour, and .9 volt in one hour.
The daily loads on these cells is currently only an estimate. The food truck has three small refrigerators, a roof vent for the hood over the grills, all LED lighting and minimal other electrical equipment. It will currently operate with all equipment running wide open from a single 15 amp landline cord. The roof mounted A/C doesn't work, but I imagine that would increase amp draw by a bunch, especially on startup. I'm pretty sure we can get along just fine with our current ampacity and capacity.
Details: these are the same LiPo modules used on the Fiat 500 and Mercedes 500 electric cars. Bosch/Samsung made them at some point, then Bosch took over the whole production cycle. No way to tell which vintage these modules are. The only information I have (since Fiat and Mercedes aren't very friendly to us DIY'ers) is:http://www.samsungsdi.com/upload/ess_br ... ure_EN.pdf