[NiHaoMike]

Here's an observation I made while working on an Antec Truepower Trio550: while tracing the input circuit, I noticed that the preregulator did not use electrolytic capacitors on the input. (I got that power supply for free because the fan doesn't work. I found that the fan does work when connected directly to the output, so I just did that. Now I'm checking to see if it can be modified to have a built in UPS.) Instead, it used a 1uF, 400v polyester film capacitor. A quick search revealed that such capacitors cost only $1 each in small quantities. Since the supply is rated for 550W and an EV charger that operates on a standard outlet would be 1875W max, only 4 of those capacitors would be needed. Might as well make that 5 or even 10 for more margin. There'll be a lot of ripple, but that doesn't matter for charging batteries. (The PC power supply used a large electrolytic on the output to filter it.) It might even be possible to eliminate the output capacitors since buck converters don't ripple too badly on the output and the pulses might actually keep the batteries desulfated. Just a RC filter for the voltage sense to keep the pulses from interfering with the voltage sense circuits.