Damn guys, you make me feel like a rank amateur!
Sine Metu's dedicated 12 battery, 12v, 40Ah LiFePO4 battery configuration consists of 3 banks of 4 batteries in series, bringing them up to 48v; then the 3 banks are hooked up in parallel to build up to 120Ah. All of which feeds the 3.5Kw electric drive aboard a 50 year old, 24 foot, 5,500 pound displacement sailboat in San Diego.
All of this is BMS controlled.
All of this is BMS controlled.
Once the system is completely setup, I hope to charge everything from the drive feed's bus bar by an AmpAir 100 watt wind generator (guessing 90%) and by ReGen (10%) from the drive while sailing, or by a 48v, 15A charger at the dock. I'll get back to you with real performance numbers, hopefully, by Christmas, but the shore power charging system seems to work keeping everything topped off and happy. The engine's controller is being upgraded currently by Electric Yachts and not hooked up, so I have not been putting any real loads on the system yet.
Oh, and the 12v house system is charged from the 48v bank via a Morningstar 15A MPPT and/or bypassed entirely by the 48-12v Sevcon DC-DC converter (installed as a backup). 12v loads are low: Bilge pumps, VHF, navigation and cabin lights (all LED), stereo and navigation equipment.