Or system, a bit expensive, and more than we needed. Scratch the extra ESS, and if just using for house, then about 10 years, for ROI. We're home all day and abuse the AC, along with a lot of water pump use, watering greenhouse & garden with stored rain water vs city water. Add charging the EVs, and knocks that in half. On my solar thread I estimate 4+ yrs recently, before calculating actual kms away from the house, overnights with the EV. oops Will have about 68k kms on the car at 4 yr mark, and 40k of those will be charged away from the house, so a bit more, way more, than I estimated. With the EV, 5+ yrs ROI, instead of 4+ years.