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This is a great first step. And I'll have to go look at my energy bill... but I think it's super important to keep scale in mind. The 10 kWh unit may do the trick for your house, and could certainly help in the evening offset if you have solar - but for backup? and if you drive an electric car? Plan on buying several. My little Leaf has a 24kWh battery. The least expensive Tesla Model S has a 40 kWh battery. So if you need to be able to charge your car AND run your house in an off grid situation - you'll need several units. Luckily - the price is reasonable. This is super exciting. I loved the diagram showing the US and the little blue square showing the amount of solar panel real estate needed to power the country.