The main reason for a separate starting and house batteries is that they are of different type (construction). the starting battery is supposed to give you high output (100A ?) for a short time, but it hates to be discharged. he house battery should be deep -cycle, I.e. it allows to be discharged quite a bit (at least, down to 50% or even lower) without damage, but it does not like high output that might be required to start an engine (I don't have an inboard, so I don't have the problem).
If you run high current through a deep-cycle battery you may damage the plates. There are batteries that would work fine in both situations (some AGMs), but I don't think you have any of those. Btw. if you go solar, don't skimp on the regulator. Without one or with a cheap one, you can kill the battery in no time. Don't ask how I know. Marek s/v Fennel (C&C 24) Ottawa
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