Join Date: Jun 2006
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I agree, Bruce. My plans are for simple (and big) battery banks and more complicated switching. The idea is that multiple charge sources (alt, solar, wind, genset if needed) feed into the house banks of 4 x 8D batteries, circa 840 Ah in my "vision". This in turn feeds to 12 VDC "house" circuits, a 2000W inverter/charger, and an echo charger that feeds the start battery. A secondary charge circuit can be selected to charge a second deep cycle forward for anchor winch power, but this is not directly connected to the main bank with heavy cable.
Circuit monitoring and isolators determine when the house batteries "feed" the echo charger, and when alternator power can bypass the house bank and directly charge either the start and windlass circuits, or both.
If we are motorsailing on a sunny, breezy day say to get out to the three-mile limit to pump the holding tank, I might very well have topped-off house batteries in this scenario. Routing alternator output to the start battery is faster and more efficient and takes nothing from the house bank.
Finally, I would consider a circuit from the house bank to "jump" the diesel under emergency situations. All this makes for a fair bit of monitoring and management, but it keeps the cabling and runs short and accessible...and keeps the big "house" bank above the 80% spot that is ideal.