Tesla Powerwall 2 Battery Storage System

It depends on the setup. If you want to use Powerwall as a backup only system, then you don’t need the inverter, but if you’re adding panels you need solar inverter as power does not connect to the panels.

Of course, yes. Depends on how much you want to spend on Panels and extra Powerwalls if that’s needed. A lot of people in South Africa run off grid on Powerwall. We have one installation in Kommejtie Cape Town fully off grid on Powerwall.

Yes, it is well worth the cost. There is no battery system that comes close to Powerwall. Even if you do a comparison on cost per kWh, Powerwall works out cheaper. Just consider the benefits, 10yr guarantee plus 20yr 80% linear output warranty. Meaning in 20yrs, you should still get 80% out of the Powerwall. No other battery manufacture offers that. Plus, your battery is always updated with Tesla OTU ( over the wire updates ) so basically you always have the latest software on the battery adapted to your battery working conditions. Also with liquid thermal control, your Powerwall always runs at optimal temperature, no matter the weather.

It’s not a matter of how many panels, you can use 2 panels and it will take you 6 months to charge. It’s about how fast you want to charge and what is your current load consumption. Remember power going in the battery is solar power produced, minus solar power directly consumed or used by the loads and balance is what goes in the battery. We calculate that on average there is only 5hrs of sunshine so we need to charge Power wall in 4-5hrs.