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Assuming that the 20m extension lead is a standard 10amp one, Rajah is right, the voltage drop would be unacceptable if the power source is only putting out marginal voltage, say 12-13v. If the source is putting out say 13.5-14.5v then the 10amp lead might suffice. The easy answer is to get 15amp cable as used on caravans, and attach your 10amp plugs to it. The quality of the lead makes very little difference; generally available extension leads use copper wire, and only the diameter of the wire matters.
raymo
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