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The Sol-Ark can accept up to 17K of solar, but only 15K is usable. The EG4 can accept up to 21K of solar, but only 18K is usable. In grid tied standards the Sol-Ark is a 15K and the EG4 is a 12K inverter, based on their max output current on-grid. In off grid standards, they are both 12K...

That would be a waste of money. Tesla Powerwalls are an AC coupled inverter that require the use of a Tesla Gateway as the Microgrid Interconnect Device(transfer switch). It would be possible but you would not be using the built in transfer switch of the EG4, the backup functionality, or any of...