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First of allI'm wondering about the need of a 50Hp engine? If you need that much change it to an Evinrude E-tech that may even be stared manually and have a much more powerfull chargingsystem even with a splitter for dual batteries.
I carried on my trip a Honda 1000W (ie1000) which is plenty of power, but the 12 volt output is not good for charging, you need a separate battery charger.
Solar panels does (normally) not charge an empty battery, but you may probably need some 3 - Amp efective charging. I advice to have one or two smaller panels that may be directed than fixed big ones. Note that just the shadow of a stay or shroud severly reduces the efficiency.
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