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Old 10-28-2004, 09:41 PM   #1
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Default Need help finding cheap alternative powersupply

As most of you know, a good powersupply (one that can pump out 15amps or more) is fairly costly.

I see these computer powersupplies but they never put the actual continuous amp rating. They just say max wattage. (for example 500watt) Does it mea it can pump 500/12 amps @ 12 volts?

Please help, thanks
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Old 10-28-2004, 09:51 PM   #2
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Is That the peak wattage of that ps If you use ohms law a 500 watt ps would put out 41 amps at 12 volts (P/E). Maybe it could peak at that but not continous.
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Old 10-28-2004, 10:55 PM   #3
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http://www.radiodan.com/misc/samlex1223.htm

Here you go.
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Old 10-29-2004, 01:25 AM   #4
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Radio Shack sells the same supply as above. I think they are about $79.99 when you can find them.
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Old 10-29-2004, 02:08 AM   #5
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www.promatchracing.com has the victor 12amp powersupplies for $39.99 These are nice little powersupplies and if I didn't have my duracomm I'd probably get one.
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Old 10-29-2004, 03:08 AM   #6
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PC power supply suppliers print the max amp output for each voltage on the label. 200 watt power supply usually gives you about 8 amps on the 12 volt line. 15 amps on the 5 volt line. My 600 watt PC PS has 25 amps on the 12 volt line.

Keep in mind that PC PS give out highly regulated 12 volts on the 12 volt line, most standalone PS give you 14 volts "no load" even if they say 12v, then the voltage can fall down to 10 volts when you're using the PS, but that's mostly the cheaper power supplies, high quality one will keep the voltage steady. I've seen one with 18 volts "no load" and it ruined a charger. Also keep in mind that a lot of chargers tend to false peak the batteries if the voltage is too low.

Last edited by andsetinn; 10-29-2004 at 03:15 AM.
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