Actually the Thermal Take 650W supply only has 12 volt outputs. It is made to supply power to dual graphics cards. I'm planning on using mine with a 12v battery to avoid the crowbar foldover. Definitely plan on fusing both 12v circuits.
The power supply is dual voltage rated, and I'm running it with a 300vdc bus so I think I'm safe from having it shut down from over voltage. The people running 144 volts or less may have trouble. I wouldn't rely exclusively on the power supply, I'd use it as a replacement for an alternator.
I used a 12v 10a supply to run a 100w spotlight. I'd have to get the bulb warmed up on 5vdc, then click to 12vdc. If I tried to just plug in to 12v, the supply would crowbar and I'd have to shut it off and retry. When the supply crowbars, it may be shorting out the output. If you are connected to a battery when this happens it may short your battery, or atleast cause a serious battery drain.
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Originally Posted by lazzer408
PC powersupplies are larger and have less current. They have a hard time with inductive loads or current spikes and trip into protection to easy. A 400w psu might only have 150-200w of that on the +12v rail. All the extra rails, 3.3v, 5v, -5, -12, ect will be un used. Some have low voltage shutoff and will shut down when the line voltage drops. They won't handle battery sag either. They are not power factor correcting until you get into the expencive models.
I have mentioned that most smps powersupplies will run on dc but how well is any ones guess. I happened to have one of these power express supplies kicking around from my old computer and gave it a go. I was suprised how well it took my abuse. For the price I don't think there's much else out there.
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Re: Cheapest DC-DC converters. 650w for $100 you say?
) running down to 60v. The 144v guys shouldn't have any issues with it.
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