this post was submitted on 25 Dec 2024
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how much power does your system need? (lemmy.ml)
submitted 1 day 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 61 points 1 day ago* (last edited 1 day ago) (3 children)

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 21 points 1 day ago* (last edited 21 hours ago) (2 children)

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

[–] acockworkorange@mander.xyz 2 points 22 hours ago* (last edited 22 hours ago) (1 children)

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 21 hours ago* (last edited 21 hours ago)

Whoops, typo! Fixed c:

[–] catloaf@lemm.ee 7 points 1 day ago

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

[–] cholesterol@lemmy.world 2 points 1 day 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.

[–] muntedcrocodile@lemm.ee 4 points 1 day ago

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