For those that need high power 12 Volt DC power supplies, check this one out. I just bought a 24 volt version of this power supply, it's very well made. On the negative side, its got a fan that is rather noisy in a quiet environment.
Take a look at their 12 Volt DC, 50 Amp version! They also have a 13.5 volt 44 Amp version.
Simple to hook up. Connect a three wire AC power cable to the Hot, Line, and ground connections, and connect your load or charger to the heavy duty lugs of its 12 VDC, 50 Amp output.
And, if you need more current, they show a hookup on how to parallel them for a 12 Volt, 100 Amp power supply.
This switching power supply is unusual. Its output can be varied from 100% down to 20% with a simple potentiometer connected to a regulated 5 VDC source.
I've purchased from this company for years, picked up several 48 VDC supplies from them at work 6 years ago. Far as I know, they are still working, after being on 24 hours a day, 365 days a year.