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how much power does your system need? (lemmy.ml)
submitted 2 years ago by 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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[–] 17 points 2 years ago* (1 child)

It's the other way around. 0.1 kWh means 0.1 kW times 1 h. So if your device draws 0.1 kW (100 W) of power for an hour, it consumes 0.1 kWh of energy. If your device factory draws 360 000 W for a second, it consumes the same amount of 0.1 kWh of energy.

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  • [–] [S] -3 points 2 years ago (2 children)

    Thank you for explaining it.

    My computer uses 1kwh per hour.

    It does not yet make sense to me. It just feels wrong. I understand that you may normalize 4W in 15 minutes to 16Wh because it would use 16W per hour if it would run that long.

    Why can't you simply assume that I mean 1kWh per hour when I say 1kWh? And not 1kWh per 15 minutes.

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  • [–] 6 points 2 years ago*

    A watt is 1 Joule per Second (1 J/s). E.g. Every second, your device draws 1 Joule of energy. This energy over time is called "Power" and is a rate of energy transfer.

    A watt-hour is (1 J/s) * (1 hr)

    This can be rewritten as (3600 J/hr) * (1 hr). The "per hour" and "hour" cancel themselves out which makes 1 watt-hour equal to 3600 Joules.

    1 kWh is 3,600 kJ or 3.6 MJ

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