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I wonder if my system is good or bad. My server needs 0.1kWh.

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[–] [email protected] 67 points 1 week ago* (last edited 1 week 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.

[–] [email protected] 28 points 1 week ago* (last edited 1 week ago) (3 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

[–] [email protected] 8 points 1 week ago

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

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[–] [email protected] 42 points 1 week ago* (last edited 1 week ago) (4 children)

kWh is a unit of energy, not power

[–] [email protected] 6 points 1 week ago (1 children)

I was really confused by that and that the decided units weren't just in W (0.1 kW is pretty weird even)

[–] [email protected] 6 points 1 week ago (6 children)

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

[–] [email protected] 6 points 1 week 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.

[–] [email protected] 5 points 1 week 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.

[–] [email protected] 6 points 1 week ago (1 children)

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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[–] [email protected] 30 points 1 week ago (12 children)

Do you mean 0.1kWh per hour, so 0.1kW or 100W?

My N100 server needs about 11W.

[–] [email protected] 5 points 1 week ago

The N100 is such a little powerhouse and I'm sad they haven't managed to produce anything better. All of the "upgrades" are either just not enough of an upgrade for the money, it just more power hungry.

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[–] [email protected] 26 points 1 week ago* (last edited 1 week ago) (8 children)

0.1kWh per hour? Day? Month?

What's in your system?

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[–] [email protected] 26 points 1 week ago

Mate, kWh is a measure of electricity volume, like gallons is to liquid. Also, 100 watt hours would be a much more sensical way to say the same thing. What you've said in the title is like saying your server uses 1 gallon of water. It's meaningless without a unit of time. Watts is a measure of current flow (pun intended), similar to a measurement like gallons per minute.

For example, if your server uses 100 watts for an hour it has used 100 watt hours of electricity. If your server uses 100 watts for 100 hours it has used 10000 watts of electricity, aka 10kwh.

My NAS uses about 60 watts at idle, and near 100w when it's working on something. I use an old laptop for a plex server, it probably uses like 50 watts at idle and like 150 or 200 when streaming a 4k movie, I haven't checked tbh. I did just acquire a BEEFY network switch that's going to use 120 watts 24/7 though, so that'll hurt the pocket book for sure. Soon all of my servers should be in the same place, with that network switch, so I'll know exactly how much power it's using.

[–] [email protected] 25 points 1 week ago (4 children)

Idles at around 24W. It’s amazing that your server only needs .1kWh once and keeps on working. You should get some physicists to take a look at it, you might just have found perpetual motion.

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[–] [email protected] 11 points 1 week ago (4 children)

I came here to tell my tiny Raspberry pi 4 consumes ~10 watt, But then after noticing the home server setup of some people and the associated power consumption, I feel like a child in a crowd of adults 😀

[–] [email protected] 4 points 1 week ago

I'm using an old laptop with the lid closed. Uses 10w.

All in, including my router, switches, modem, laptop, and NAS, I'm using 50watts +/- 5.

It does everything I need, and I feel like that's pretty efficient.

[–] [email protected] 4 points 1 week ago

I have an old desktop downclocked that pulls ~100W that I'm using as a file server, but I'm working on moving most of my services over to an Intel NUC that pulls ~15W. Nothing wrong with being power efficient.

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[–] [email protected] 10 points 1 week ago (5 children)

My server rack has

  • 3x Dell R730
  • 1x Dell R720
  • 2x Cisco Catalyst 3750x (IP Routing license)
  • 2x Netgear M4300-12x12f
  • 1x Unifi USW-48-Pro
  • 1x USW-Agg
  • 3x Framework 11th Gen (future cluster)
  • 1x Protectli FE4B

All together that draws.... 0.1 kWh.... in 0.327s.

In real time terms, measured at the UPS, I have a running stable state load of 900-1100w depending on what I have at load. I call it my computationally efficient space heater because it generates more heat than is required for my apartment in winter except for the coldest of days. It has a dedicated 120v 15A circuit

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[–] [email protected] 9 points 1 week ago* (last edited 1 week ago) (2 children)

9 spinning disks and a couple SSD's - Right around 190 watts, but that also includes my router and 3 PoE WiFi AP's. PoE consumption is reported as 20 watts, and the router should use about 10 watts, so I think the server is about 160 watts.

Electricity here is pretty expensive, about $.33 per kWh, so by my math I'm spending $38/month on this stuff. If I didn't have lots of digital media it'd be worth it to get a VPS probably. $38/month is still cheaper than Netflix, HBO, and all the other junk I'd have to subscribe to.

[–] [email protected] 4 points 1 week ago

That's true. And the children of my family see no ads which is priceless. Yet I am looking into ways to cut costs in half by using an additional lower powered mini pc which is always on and the main computer only running in the evening - maybe.

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[–] [email protected] 8 points 1 week ago (4 children)

17W for an N100 system with 4 HDD's

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[–] [email protected] 7 points 1 week ago (3 children)

Between 50W (idle) and 140W (max load). Most of the time it is about 60W.

So about 1.5kWh per day, or 45kWh per month. I pay 0,22€ per kWh (France, 100% renewable energy) so about 9-10€ per month.

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[–] [email protected] 6 points 1 week ago* (last edited 1 week ago) (5 children)

I think at max 200w? It runs a collection of fedi/self service stuff.

I also run a pi with a couple of apps on a pi 3 that sips power.

It's a legitimate issue because it's 50+ cents per killowat hour where I live so power is very expensive...

[–] [email protected] 6 points 1 week ago (3 children)

That seems really high, I think power where I live is about 12-14 cents per kilowatt hour. What makes it so expenses where you live?

[–] [email protected] 7 points 1 week ago* (last edited 1 week ago) (1 children)

Mostly just that they can. It's more expensive per tier actually.

https://www.pge.com/assets/pge/docs/account/rate-plans/residential-electric-rate-plan-pricing.pdf

Take a look, this is the old pricing. They just voted to up it again.

There's legislation that is moving along to charge people with solar because...idk.

[–] [email protected] 5 points 1 week ago (5 children)

They’re charging for solar because PGE is a greedy fuck.

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[–] [email protected] 6 points 1 week ago (3 children)

For the whole month of November. 60kWh. This is for all my servers and network equipment. On average, it draws around 90 watt.

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[–] [email protected] 6 points 1 week ago (1 children)

About 700 watts, it makes for a decent space heater in the winter.

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[–] [email protected] 5 points 1 week ago

My 10 year old ITX NAS build with 4 HDDs used 40W at idle. Just upgraded to an Aoostart WTR Pro with the same 4 HDDs, uses 28W at idle. My power bill currently averages around US$0.13/kWh.

[–] [email protected] 5 points 1 week ago* (last edited 1 week ago)

Around 18-20 Watts on idle. It can go up to about 40 W at 100% load.

I have a Intel N100, I'm really happy about performance per watt, to be honest.

[–] [email protected] 5 points 1 week ago* (last edited 1 week ago) (4 children)

last I checked with a kill-a-watt I was drawing an average of 2.5kWh after a week of monitoring my whole rack. that was about three years ago and the following was running in my rack.

  • r610 dual 1kw PSU
  • homebuilt server Gigabyte 750w PSU
  • homebuilt Asus gaming rig 650w PSU
  • homebuilt Asus retro(xp) gaming/testing rig 350w PSU
  • HP laptop as dev env/warmsite ~ 200w PSU
  • Amcrest NVR 80w (I guess?)
  • HP T610 65w PSU
  • Terramaster F5-422 90w PSU
  • TP-Link TL-SG2424P 180w PSU
  • Brocade ICX6610-48P-E dual dual 1kw PSU
  • Misc routers, rpis, poe aps, modems(cable & 5G) ~ 700w combined (cameras not included, brocade powers them directly)

I also have two battery systems split between high priority and low priority infrastructure.

[–] [email protected] 5 points 1 week ago (1 children)

Ugh, I need to get off my ass and install a rack and some fiber drops to finalize my network buildout.

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[–] [email protected] 4 points 1 week ago

I'm idling at 120W with eight drives, but I'm currently looking into how to lower it.

[–] [email protected] 4 points 1 week ago

My whole setup including 2 PIs and one fully speced out AM4 system with 100TB of drives a Intel Arc and 4x 32gb ecc ram uses between 280W - 420W I live in Germany and pay 25ct per KWh and my whole apartment uses 600w at any given time and approximately 15kwh per day 😭

[–] [email protected] 4 points 1 week ago* (last edited 1 week ago)

Idle: 30 Watts

Starting all docker containers after reboot: 140 Watts

It needs around 28 kWh per month.

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