Steve,
Thanks for all the information about your system.
With my current FLA bank (2 X 8 Trojan T-145 6 volt batteries) I always run the 2 strings in parallel. I only switch a string off for maintenance. For my boat I really need both strings for capacity, and will likely need 2 X 48V strings if I go the LiFePo4 route. If I know that when I start my trip that I will need to motor for quite some time to reach an anchorage, I'll run my generator, regardless of my bank SOC so that I don't have to listen to the generator for hours on end once I'm on the hook. My generator is a 4.2 kW 120 VAC unit that feeds into a Victron Quatro charger/inverter. It has an internal automatic transfer switch that selects between shore power, or generator. It gives preference to the generator. It does support BMS interface as I described earlier. So, I wouldn't want the charger to wait until the bank was already depleted to start charging if I had a day of significant motoring and wanted some peace and quite once anchored. Also, with the size of my boat, I sometimes need both the charger and the batteries working together to keep SOC from getting too low before getting back to the dock.
Because of my 2 banks is why I posed the question about needing 2 BMS. Either that, or I should just permanently parallel the 2 banks, 2 X 16 cells in parallel. Not sure how this would work from a BMS perspective. Maybe 1 X 32 cell BMS?
Chris
Posted by: clh5_98@yahoo.com
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