▲ 106 ▼ how much power does your system need? (lemmy.ml) submitted 2 years ago by GravitySpoiled@lemmy.ml to c/selfhosted@lemmy.world 128 comments fedilink hide all child comments I wonder if my system is good or bad. My server needs 0.1kWh.
[+] GravitySpoiled@lemmy.ml [S] -7 points 2 years ago (3 children) To my understanding 0.1kWh means 0.1 kW per hour. permalink fedilink source parent hideshow 6 child comments replies: [–] d_k_bo@feddit.org 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. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [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. permalink fedilink source parent hideshow 4 child comments replies: [–] 486@lemmy.world 15 points 2 years ago* (1 child) kWh is a unit of power consumed. It doesn't say anything about time and you can't assume any time period. That wouldn't make any sense. If you want to say how much power a device consumes, just state how many watts (W) it draws. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 4 points 2 years ago Thanks! permalink fedilink source parent [–] __nobodynowhere@startrek.website 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 permalink fedilink source parent [–] elmicha@feddit.org 2 points 2 years ago (1 child) 0.1kWh per hour can be written as 0.1kWh/h, which is the same as 0.1kW. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 8 points 2 years ago (2 children) Thanks. Hence, in the future I can say that it uses 0.1kW? permalink fedilink source parent hideshow 4 child comments replies: [–] Atemu@lemmy.ml 8 points 2 years ago If this was over an hour, yes. Though you'd typically state it as 100W ;) permalink fedilink source parent [–] elmicha@feddit.org 3 points 2 years ago Yes. Or 100W. permalink fedilink source parent [+] Mubelotix@jlai.lu 1 point 2 years ago [deleted] permalink fedilink source parent
[–] d_k_bo@feddit.org 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. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [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. permalink fedilink source parent hideshow 4 child comments replies: [–] 486@lemmy.world 15 points 2 years ago* (1 child) kWh is a unit of power consumed. It doesn't say anything about time and you can't assume any time period. That wouldn't make any sense. If you want to say how much power a device consumes, just state how many watts (W) it draws. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 4 points 2 years ago Thanks! permalink fedilink source parent [–] __nobodynowhere@startrek.website 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 permalink fedilink source parent
[–] GravitySpoiled@lemmy.ml [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. permalink fedilink source parent hideshow 4 child comments replies: [–] 486@lemmy.world 15 points 2 years ago* (1 child) kWh is a unit of power consumed. It doesn't say anything about time and you can't assume any time period. That wouldn't make any sense. If you want to say how much power a device consumes, just state how many watts (W) it draws. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 4 points 2 years ago Thanks! permalink fedilink source parent [–] __nobodynowhere@startrek.website 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 permalink fedilink source parent
[–] 486@lemmy.world 15 points 2 years ago* (1 child) kWh is a unit of power consumed. It doesn't say anything about time and you can't assume any time period. That wouldn't make any sense. If you want to say how much power a device consumes, just state how many watts (W) it draws. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 4 points 2 years ago Thanks! permalink fedilink source parent
[–] __nobodynowhere@startrek.website 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 permalink fedilink source parent
[–] elmicha@feddit.org 2 points 2 years ago (1 child) 0.1kWh per hour can be written as 0.1kWh/h, which is the same as 0.1kW. permalink fedilink source parent hideshow 2 child comments replies: [–] GravitySpoiled@lemmy.ml [S] 8 points 2 years ago (2 children) Thanks. Hence, in the future I can say that it uses 0.1kW? permalink fedilink source parent hideshow 4 child comments replies: [–] Atemu@lemmy.ml 8 points 2 years ago If this was over an hour, yes. Though you'd typically state it as 100W ;) permalink fedilink source parent [–] elmicha@feddit.org 3 points 2 years ago Yes. Or 100W. permalink fedilink source parent
[–] GravitySpoiled@lemmy.ml [S] 8 points 2 years ago (2 children) Thanks. Hence, in the future I can say that it uses 0.1kW? permalink fedilink source parent hideshow 4 child comments replies: [–] Atemu@lemmy.ml 8 points 2 years ago If this was over an hour, yes. Though you'd typically state it as 100W ;) permalink fedilink source parent [–] elmicha@feddit.org 3 points 2 years ago Yes. Or 100W. permalink fedilink source parent
[–] Atemu@lemmy.ml 8 points 2 years ago If this was over an hour, yes. Though you'd typically state it as 100W ;) permalink fedilink source parent