Congrats! Sweet boat. A bit over 400 watts gives you 3 knots; that's solar panel cruising territory - travel all day without draining your 48v Lead-Acid battery bank.
Speaking of FLA or SLA batteries, they don't mind sitting if they get daily micro charging. A small 50 watt, 60 volt PV array hooked to your 48v battery bank would keep them fresh for a decade. I'm 10 years on two parallel 40Ah FLA cheap deep cycle 12v batteries hooked directly (no charge controller) to a 15w solar panel on an inboard diesel sailboat. They have never seen a shore power charger, and only get alternator charged once every few weeks to 5 months. Daily charging amps below about 1 amp per battery are too weak to drive internal battery bubble formation, but are strong enough to reverse the overnight micro-sulfation. The biggest killer of deep cycle LA batteries is continuously accumulating sulfation, with industrial heavy use deep discharge claiming most of the rest (reasonably).
Another common way to minimize sulfation is those $5 wall-wart float chargers. Since I've had them fail silently and drain batteries, I favor solar.
Mark Stafford
eGEO, eKayak, eBike, eHouse, eMotorcycle
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Posted by: mstafford@natca.net
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