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Originally Posted by Ford850
I'd take Patrick's advice and look for a basic battery charger.
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I think I may have mentioned that TRANSFORMERS do not put out DC!
Transformers put out AC. Reversing the connections will not possibly make a difference with AC since the connections are being reversed for you by the power company many times a second!
LBROWN59, A battery charger can run a motor like for a pump even though it does not put out smooth DC. The motor integrates the irregular waveform.
If you have even a small 12 volt rechargeable battery like for a riding lawnmower or garden tractor you can hook the battery charger to that and to the pump and get by with a charger rated for around 10-12 amps. IF yoiu are using just the charger to run the pump you will want one with a higher rating, maybe 15-20 amps (which costs more.)
If you use your tractor or truck battery to run the pump (with the engine switched off) and hook up a battery charger rated for 10 amps or more to that battery while pumping fuel it will work fine and you can leave the charger on the battery for just a little longer than fuel pumping to be sure pumping fuel has not run down the battery.
This will let you buy a smaller charger (10-12 amp). I had previously assumed you had a battery charger but if not then buying one is a good idea as they can come in very handy every so often.
Buying a 12VDC power supply will typically cost more than a battery charger of similar rated output and although it would run the pump fine, or power a radio or whatever, a power supply does not make the best battery charger. The best bet is the battery charger for which you will have other uses.
Pat