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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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[–] 6 points 2 years ago (2 children)

Wh shouldn't even exist tbh, we should use Joules, less confusing

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  • [–] 6 points 2 years ago (2 children)

    Watt hours makes sense to me. A watt hour is just a watt draw that runs for an hour, it's right in the name.

    Maybe you've just whooooshed me or something, I've never looked into Joules or why they're better/worse.

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  • [–] 5 points 2 years ago (2 children)

    Joules (J) are the official unit of energy. 1W=1J/s. That means 1Wh=3600J or that 1J is kinda like "1 Watt second". You're right that Wh is easier since everything is rated in Watts and it would be insane to measure energy consumption by seconds. Imagine getting your electric bill and it says you've used 3,157,200,000J.

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  • [–] 6 points 2 years ago (1 child)

    3,157,200,000J

    Or just 3.1572GJ.

    Which apparently is how this Canadian natural gas company bills its customers: https://www.fortisbc.com/about-us/facilities-operations-and-energy-information/how-gas-is-measured

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  • [–] 1 point 2 years ago (1 child)

    At least in the US, the electric company charges in kWh, computer parts are advertised in terms of watts, and batteries tend to be in amp hours, which is easy to convert to watt hours.

    Joules just overcomplicates things.

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  • [+] 1 point 2 years ago* (3 children)
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  • [–] 2 points 2 years ago

    I did a physics degree and am comfortable with Joules, but in the context of electricity bills, kWh makes more sense.

    All appliances are advertised in terms of their Watt power draw, so estimating their daily impact on my bill is as simple as multiplying their kW draw by the number of hours in a day I expect to run the thing (multiplied by the cost per kWh by the utility company of course).

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  • [–] 2 points 2 years ago*

    Wow, the US education system must be improved.

    I pay my electric bill by the kWh too, and I don't live in the US. When it comes to household and EV energy consumption, kWh is the unit of choice.

    1J is 3600Wh.

    No, if you're going to lecture people on this, at least be right about facts. 1W is 1J/s. So multiply by an hour and you get 1Wh = 3600J

    That's literraly the same thing,

    It's not literally the same thing. The two units are linearly proportional to each other, but they're not the same. If they were the same, then this discussion would be rather silly.

    but the name is less confusing because people tend to confuse W and Wh

    Finally, something I can agree with. But that's only because physics is so undervalued in most educational systems.

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