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Reply With QuoteYes it will be close enough.
Be sure to measure it when doing something as intensive as possible (download and run prime95 or something) to get your upper limit draw.
I just ordered a Kill-a-Volt to help me measure power usage around the house, and I thought I'd also use it to measure how much juice my soon-to-be-installed carputer will suck up. Is there any difference between AC wattage and DC wattage? I'll be using the Kill-A-Volt to measure my carputer plugged into my wall. Can I use that measurement to figure out big a DC-DC OPUS to get?
Yes it will be close enough.
Be sure to measure it when doing something as intensive as possible (download and run prime95 or something) to get your upper limit draw.
You will need to estimate your AC power supply efficiency: that is the ratio between the AC power used ( read by the kill-a-watt ) and the DC power delivered ( used by the PC ), the difference is dissipated as heat.
Common ATX power supplies tend to be in the 50-80% range ( depending on load and make )
Good to know, thanks! Does this means that the Opus will draw 20-50% less power than an AC ATX PS?
no because the opus is about 90% efficient depending on which model you choose
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