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Message: <blockquote data-quote="user 26281" data-source="post: 488965" data-attributes="member: 26281">From quick research the Si-ARC puts all  batteries in parallel for charging and isolates the staring battery from house batteries while discharging.  Uses starting for starter and house for everything else.  So there should not be any issues with start/house in parallel.  Some units are wired to a start circuit. With batteries wired in parallel, the battery with the lowest internal resistance is going to charge/discharge the most, so most recommendations are to use idential batteries made around the same time.</blockquote>