We have 2 House/start battery banks. 16 (8 volt golf cart batteries), for a total of 660 AH at 32 volts, I two banks port/ starboard. I have 4 solar panels that provide 1465 watts of power, rinsing into an Outback solar charger. Batteries run all 32 VDC equipment, bilge pumps, macerators, windlass, etc. Charging is thru, engine alternators, when running, Solar when on hook, and Outback charger when on shore power. We spend the summer on a mooring in the NE, and the solar will keep batteries up on most days. If we need hot water, cooking, will run generator and charge batteries as well. The Outback inverter will drop out at around 29 volts, so we loose ac power..
Even with the batteries too low to run the inverter, I have always been able to start the engines, etc.
I am very happy with this set up, batteries are going on 7 years old..all good. I am looking forward, as robust as the 32 v Outback is, it will not last forever, thus reason to have a spare.
Question for you all..If upgraded to a 48 Volt system, with a large Lithium bank. Could I run
a large DC-DC supply , 48-32, to start engines, run all 32 volt remaining equipment.
Ken..