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Q: Has anyone experienced the boost/step up causing phantom drain on the battery in a car?

Yes this will drain battery. You need to install a switch when it is not in use. I just bought a 36v Golf cart and the batteries were dropping voltage when sitting. Come to find out the reducer was draining battery voltage even when there was no accessories on.

Q: Will this work to protect a 12v to 12v battery charger if mounted between a 12vdc (20.48v actual out put) generator and the charger? All on a 8a fuse.

The regulator is not performing as advertised . If the power is kept below 25 volts then it works fine but at 30 volts it acts like an SCR has fired and shorts out the PS , some form of current shunting occurs . Honda 4 magnet flywheel roters can gen. a little higher voltage .2 magnet flywheel such as on a Kawasaki 12 hp or similar may gen lower voltages . You must us a dc input ,rectified and filtered .

Q: Can i send 12v ac as an input or does the input need to be dc?

DC only. This is a DC-DC converter. If you want to do AC, it's best to get a transformer.

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The input says 40-60v input, can I hook 36volts to it also???

Has anyone experienced the boost/step up causing phantom drain on the battery in a car?

Will this work to protect a 12v to 12v battery charger if mounted between a 12vdc (20.48v actual out put) generator and the charger? All on a 8a fuse.

Can i send 12v ac as an input or does the input need to be dc?