We are looking at a Tesla solar installation mainly for grid outages, currently have a generator and some small battery backup. Based on our average electric bill Tesla recommends 8 kW PV and 1 Powerwall. Since we don't plan to offset all of our grid usage we'd prefer to go with the lower cost 4 kW PV and 1 Powerwall unless there some good reasons to stick with the larger system.
I know it will not be easy to add panels later. Also we have a better chance of having power to export with the 8 kW system. And it would be nice to have more PV available during an outage if there is not good sunshine. Any other reasons that would make the larger system worth the extra cost?
I know it will not be easy to add panels later. Also we have a better chance of having power to export with the 8 kW system. And it would be nice to have more PV available during an outage if there is not good sunshine. Any other reasons that would make the larger system worth the extra cost?