We finished this install in south Arkansas. It is a fully off grid system with on demand generator and 30x 290 watt REC module roof mount. The battery bank that is shown is an Aquion Aspen 48M Sodium-ion battery. This battery can tolerate long periods of discharge without any damage, can be cycled to 100% DOD, and has 6,000 cycles to 50% DOD. No maintenance required.