I have a Xantrex 600 watt sine wave inverter I had plans for, deep cylce battery and relays,,but never accomplished . Had the idea years ago from this forum..I have AIMS 1250 Inverter/Charger to power my stove in outages. That teamed with Two 100AH Batteries gives me 12 hours (Harmon XXV in Manual and Medium Fan Speed). https://theinverterstore.com/product/1250-watt-pure-sine-inverter-charger/