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I have some questions about a 12V battery bank on my new to me boat. It consists of four Valence U27-12XP batteries that were wired in parallel without an external BMS, but voltage-disconnect protected by a Victron Battery Protect device. I've removed the batteries for testing at home. The...

The battery bank in question is 4 x ePropulsion E163 batteries @ 48V, a total capacity of 652ah. I'm considering the best way to wire a set of solar panels in series-parallel (two strings of two panels each) to maximize the charging performance. In total, the first option has a higher Voc/Vmp...