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Originally Posted by ballaratdragons
The Amps bit always confuses me.
In that case, if 240V is nearby, a small car battery charger should work???? They are very cheap!
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That's the tricky bit! A charger is not a constant voltage supply, but a current supply. Even though a car battery is 12V, you need to charge it at around 14V. The charger works by maintaining a constant current of 4, 8 or more amps. It will vary the voltage (up to some limit) if need be, to maintain the constant current. Now that would cook your fan!!