Q: max wattage
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by John Lockwood,HelpfulSep 8, 2016 12:04 PM
John Lockwood
Sep 8, 2016 12:04 PM
in response to princebr1
Level 6
(9,260 points)
Servers EnterpriseA standard from the factory Mac Pro (or other model) would have a max wattage use figure that could be given but as soon as the user make a change by e.g. adding an additional or bigger hard disk, this figure will change.
It does not help much but here is the official specs for your Mac Pro model
Electrical and environmental requirements
- ENERGY STAR configurations available6
- Line voltage: 100-120V AC or 200-240V AC (wide-range power supply input voltage)
- Frequency: 50Hz to 60Hz single phase
- Current: Maximum of 12A (low-voltage range) or 6A (high-voltage range)
For what its worth the classic Mac Pro models have a 980watt power supply meaning that is the absolute maximum it can deliver if fully loaded.
If you want accurate figures based on your configuration and usage then the best option is to get a power socket which can measure the actual use. Here are a couple of examples of such devices.
https://www.amazon.com/P3-International-P4460-Electricity-Monitor/dp/B000RGF29Q/
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by Grant Bennet-Alder,HelpfulSep 8, 2016 1:26 PM
Grant Bennet-Alder
Sep 8, 2016 1:26 PM
in response to John Lockwood
Level 9
(60,769 points)
DesktopsIf the maximum current the Mac chassis can draw is "12A on low range (120Volts) or 6A on High range (240 Volts)" that can be converted, i.e., 120*12 Volt-Amps or 240*6 Volt-Amps, or about 1440 Volt-Amps. Then you must build in some headroom to keep it from shutting down prematurely when it gets close to those numbers. Volt-Amps are indistinguishable from Watts for this purpose (but not for every purpose).
If you use the OUTPUT of the power supply as a guide, the numbers will be too low by the amount wasted as heat in conversion to DC power.
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Sep 8, 2016 1:43 PMby princebr1,Thanks for your input!!!
So I gather that I will want to get a ups 120V*15A that is to say in the range of 1800 W? Or will a ups 120V*12A @ 1800W work too?
So this is the energy i need just for the "mac pro early 2008" working at its approximate max power? As John Lockwood mentioned the max power at factory presets is about 980W.
Currently I have all four slots occupied by hd's and this unit will function as a server to 'bridge' the two imac's mentioned above. disk 1 OS / disk 2 data-in (mirrored disk) / disk 3 data in-out and send mirror to disk 2 / disk 4 back-up disk 2. I hope I thought this well, advice welcome. This is why I am assuming the figures above.
As far as the iMac's mentioned above I am unable to find the info regarding V*Amp.. does anyone have that specs?
I hear there will be a new update soon on iMac! Maybe I should wait before I invest a substantial amount of resources to buy several iMac late 2015 since it is generally not advisable to invest a generous amount of resources in a highly priced models that will soon be out of date. It should be like buying a 2015 car in December so you pay less as the new 2016 are coming out. makes sense?
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Sep 8, 2016 3:14 PMby Grant Bennet-Alder,the max power at factory presets is about 980W.
No, that is the DC output of the Power supply. If you use that number, you will be too low by the amount of power dissipated as heat inside the power supply. and the draw of the empty chassis is beside the point.
You do not care about factory default, you care about fully-loaded upper limit, because if you add stuff over time, you do not want to have to replace your UPS. If you go too high, it costs a little more, but you don't have to scrap it when you hit the upper limit. If you use the 120V* 12A number, and the UPS is too conservative, it could power down when you fire up everything inside your Mac all at once. You need a UPS that is Bigger than your worst case. If it is bigger than needed, it will simply last a little longer than expected before giving out.
