I just got a 7.8kw solar array installed on my roof (live in Virginia). I got a company, PEG Solar, to take care of everything. The total project cost (panels, inverter, installation, meter, EV Charger etc) before tax credits and incentives was $21,000. Over the past week it has generated about 12kwh per day, which is just a little less than what you would need to offset your electric costs, so if I were you, I'd be looking at a 8-9 kw system if you want to be 100% renewable.