There are of course plug and play options, like the Pylontech H1 or BYD HVL that meet UL9540. In my case, I’m running the Seplos HItens ( pair in parallel for 40kwh ) just received with are half the cost of the UL9540 options. The Hitens for the Solis S6 come in 10kwh, 15kwh and 20kwh options
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