If you drive say 300 miles a week that’s 100kWh for a typical electric car. Another 150 for domestic use and that’s 35kwh a day. You have a system that generate

If you drive say 300 miles a week that’s 100kWh for a typical electric car. Another 150 for domestic use and that’s 35kwh a day. You have a system that generates more than that if you have excess to pump into liquid storage, but why do you want a weeks worth of backup energy? Why not 3 days? Or 2 weeks?