106
how much power does your system need? (lemmy.ml)
submitted 2 years ago by GravitySpoiled@lemmy.ml to c/selfhosted@lemmy.world
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I wonder if my system is good or bad. My server needs 0.1kWh.

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[-] MentalEdge@ani.social 67 points 2 years ago* (last edited 2 years ago)

You might have your units confused.

0.1kWh over how much time? Per day? Per hour? Per week?

Watthours refer to total power used to do something, from a starting point to an ending point. It makes no sense to say that a device needs a certain amount of Wh, unless you're talking about something like charging a battery to full.

Power being used by a device, (like a computer) is just watts.

Think of the difference between speed and distance. Watts is how fast power is being used, watt-hours is how much has been used, or will be used.

If you have a 500 watt PC, for example, it uses 500Wh, per hour. Or 12kWh in a day.

[-] fool@programming.dev 28 points 2 years ago* (last edited 2 years ago)

I forgive 'em cuz watt hours are a disgusting unit in general

idea what unit
speed change in position over time meters per second m/s
acceleration change in speed over time meters per second, per second m/s/s=m/s²
force acceleration applied to each of unit of mass kg * m/s²
work acceleration applied along a distance, which transfers energy kg * m/s² * m = kg * m²/s²
power work over time kg * m² / s³
energy expenditure power level during units of time (kg * m² / s³) * s = kg * m²/s²

Work over time, × time, is just work! kWh are just joules (J) with extra steps! Screw kWh, I will die on this hill!!! Raaah

[-] catloaf@lemm.ee 8 points 2 years ago

Could be worse, could be BTU. And some people still use tons (of heating/cooling).

[-] acockworkorange@mander.xyz 2 points 2 years ago* (last edited 2 years ago)

Power over time could be interpreted as power/time. Power x time isn’t power, it’s energy (=== work). But otherwise I’m with you. Joules or gtfo.

[-] fool@programming.dev 2 points 2 years ago* (last edited 2 years ago)

Whoops, typo! Fixed c:

[-] muntedcrocodile@lemm.ee 4 points 2 years ago

kWh is the stupidest unit ever. kWh = 1000J/s * 6060s = 3.610^6J so 0.1kWh = 360kJ

[-] cholesterol@lemmy.world 2 points 2 years ago

If you have a 500 watt PC, for example, it uses 500Wh, per hour. Or 12kWh in a day.

A maximum of 500 watts. Fortunately your PC doesn't actually max out your PSU or your system would crash.

this post was submitted on 25 Dec 2024
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