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Tuesday, July 05, 2005

The Off-Grid Home or RV battery bank

The heart of an off grid system is the battery bank. It needs to be sized properly to handle your expected electrical loads between recharge times. Green-Trust runs on a 675ah battery pack consisting of six Trojan T105's, but for the budget minded, the Walmart Type 27 DeepCycle would also work. At $53 each for a 115ah 12v battery, 10 units would make a nice sized pack at 1150ah. This would give you a useful 575ah of power before needing to recharge. A good charger is critical to the health of your batteries, as well as not discharging more than 50%. One charger we recommend is the Vector 40amp charger. This is a bit undersized for our theoretical 1150ah pack, but is ideal for our 675ah pack. Since we run our VeggieGen more than 8 hours a day, it's sufficient to do a full recharge of our batteries for overnight use. Our 90 watt PV array puts about 22ah's daily into the pack as well.

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