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Your panels would not survive a good rinsing either, that has to be a consideration for this type of event.Recent experience using a ElectricYachts QuietTorque 10 electric motor (equivalent to a ~18 hp diesel) with a 300 Ahr, 48V LFP battery system comprised of 12V, 100Ahr Battle Born batteries along with 3 SunPower 110W solar panels while crossing from San Francisco to Oahu in a 30ft, 11,500lb, full keel sailboat....no you can't continually motor sail with the prop turning at ~900 RPM with this setup. We did motor sail for several hours when becalmed on two separate days so we could get ahead of weather fronts, but we then needed a few days of good sunshine to fully recharge the batteries. Sure we didn't have optimum placement of solar panels relative to potential shading, but using the motor continually was far from being our plan. We did run the motor in "regen mode" a few times during the crossing to charge the batteries, but it was mainly to slow the boat down a bit when the wind was 25 knots and above. I also have two 50W panels to keep the 2 batteries for the 12V house system topped off. We never had a shortage on the house side.
If you want to do continual motor sailing with an electric motor you will need a diesel or gas powered generator, more solar, and/or a wind generator. Not sure why you want to continually motor sail, but to each their own.
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