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Not sure about the drag- there will be some but the air on the fan will have already pushed through the radatior before it hits the fan so the drag becomes hard to measure.
I don't seee charging at home as a good option. Of course if I'm coasting my 3.5 ton truck the drag is negligble and the charging power is free.
I'm thinking I could open the charging circuit whenever the engine is pushing so it only charges when coasting.
The questions is whether or not cooling fans have Permenant magnets and whether or not they could charge the batteries.
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