Mike, a standard 60 Hz transformer is designed so that its rated power is delivered at 60 Hz. Below that frequency its imedance lowers allowing more current to pass through it. The transformer could burn out if the car wa idling too long, and depending on the frequency and voltage produced at idle speed. At higher frequencies the impedance goes up so the transformer delivers decreasing output power. I suspect that a switch mode power supply with a wide input voltage range would be a better choice and would acomplish the task in a single step. Then again, that is exactly what happens in the IMA system. The difference being that in the IMA system the IMA battery acts as a storage element allowing the 12 volt battery to be charged even if the engine is not turning.
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Kip Munro
The laws of physics don't need changing, but rather our attitude and values. 72.8 LMPG
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