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Unfortunately this looks like it would at best save about as much as having a taillight burned out.
What I'm thinking is that this would be the same as a float charge. Battery tender has some charts putting float charge at 50-100mA and chargetek says c/50-c/100 which I think would work out to slightly less for most batteries. So there's only about 5 to 13.5 watts on the table to try to save
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