I'm in the process of upgrading my 10kW / 30kWh system to 21kW / 90kWh and getting an EV. Even with that I won't be 100% off-grid. I'll be only about 90% self-sufficient. Now it's a good system as far as paying for itself 9 years from now (10th year from when I installed the original system). It's also good as far as making my budget not have to worry about the power bill, natural gas bill, and price at the pump vary a lot -- I have a fixed cost of paying the HELOC payment on the HELCO I took out to buy it all.
But even with that large system I still won't be 100% energy independent. Trying to make myself 100% independent would be running against the law of diminishing returns. So there would always be a need for power companies. I just want the government cronies (which include the utility companies) to have less control over our lives.
Where in the USA do you live? I have a 15kw/60kWh main house system and a 10kw/30kWh guest house system and both export power every month. I am in sunny North Texas my system is making 25kw right now and my homes are only using 5kw and 3kw as I type this with 2 of 4 AC units running I have dual zone climates and Mitsubishi split units for individual rooms like my man cave cigar lounge so keep that air from inside the house and the master bedroom has a Mitsubishi so I can chill it to 65 at night and not freeze out the guests or pets. We get 220 days if full sun at my location and daylight today will be 13 hours 57 minutes. I have trackers on my 15kw panels they make full rated power from 15 min after sun clears the southern horizon till.15 before it sets to the West all the trees have been cleared. The smaller 10kw is on poles that get adjusted once a month in pitch and azimuth they make 90+% of there rated power in the mid morning and late afternoon and 100% in the heart of the day. In the last five years I have exported power every month net the battery packs are new im demoing them for a associate who owns a solar instal biz so far they have been able to take me off the grid any day I chose too. Mostly I use them to buy cheap power at night at wholesale off peak rates and then in two hours from now at peak times I’ll dump all my.solar plus max out the discharge from the packs into the ERCOT pool for 50 plus cents per kWh $$$$$ to be had. It makes economic sense for me to just buy one cent per kWh at night and fill the banks up then right now all my solar excess is being grid feed out.
Learning about solar bookmark. Thanks for the explanation and insight.