Why not buy a Volt 16.5kwh battery and add your own inverter for a backup. That's what my customers are doing. That's what Tesla is selling for a whole lot more. Be careful connecting anything between your solar inverter and the grid, as it is protecting the grid from power during a power failure. You don't want to put power into the grid during a failure Also, don't unplug your solar array from a backup battery charger while it is drawing power, you will destroy the collectors unless using Micro Inverters.
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