August 23, 20215 yr Hi. New to this, and uncertain about original installation. We have an FCS-3K-VP-3000 inverter (FULLCIRCLESOLAR) installed April 2019, and 4 x 400Ah Lead-acid batteries. We have four 350W PV panels installed later. Load on the inverter is normally <25%, yet the inverter tends to swap to utility after only a few minutes of using the panels. I’m wondering if the batteries are not holding charge properly?
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