Several factors play a role in determining the power consumption of a UPS: Contact online >>
Several factors play a role in determining the power consumption of a UPS:
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We have 6 Dell PowerEdge T430 servers with 2 750W PSU on each server (one connected to the wall socket and one to a UPS system)
I''ve checked in a few vendors automated calculators and each one gave me a different result.
I do know the basics about Amps, Volts, and Watts but can not figure out how to do this calculation.
Alternatively, you can bounce your requirements off of our application engineers & they can put together a few possible solutions for you to pick from (p.m. and I can set up an intro, or you can fill out the contact form here ). This is an easy & free way to offload some of the work and get expert input.
Alternatively, you could go the route of splitting the load across smaller UPS systems. This would open the door to 120 volt UPS options, and theoretically eliminate single points of failure. For servers like this, I generally encourage people to go the online UPS route, but once you are in that lower capacity range, some lower cost line interactive units become feasible too.
Side note: I''d encourage you to consider adding UPS backup on both of the power supplies if at all possible given your budget.
I hope this helps. A lot of the specifics will come down to what you have to work with as far as budget, electrical service, outlets, etc, so if you have the time to speak with an application engineer, ping me and I''ll get something set up. You might actually want to try this across a few vendors if this is your first time sizing a UPS.
APC has a good UPS selector. If you don''t want APC, you can at least figure out what model of theirs is most suitable and pick a competing brand with the same ratings.
I would recommend two separate UPS units - one for each power supply.
For some reason it won''t let me proceed when I dump your servers into the configurator. And, it seems to want to throw you immediately into the monster datacenter UPS units when I try other methods of using it. An off day at their site maybe?
What kind of budget do you have (ballpark figures), and what is the minimum runtime you are seeking?
When determining what capacity the UPS needs to have when it''s going to backup equipment with redundant power supplies, the number of power supplies in the redundancy scheme is not a contributing factor. The total number of watts that the PSU is rated for is the only one that needs to be considered. What does need to be taken into account is the number of outlets available on the UPS so that it matches with the number of power cords needed to connect to the server(s). Although you''re only considering 1xPSU for the UPS capacity, you need to count 2xPower cords, 1 for each PSU. A PDU may be needed to distribute the UPS power to add more outlets than when what the UPS has.
Personally, if I have a way to measure actual power draw, I totally ignore PSU ratings. It''s entirely possible to have a system with a 750W PSU that will never draw more than 300W under worst case full load conditions. The important thing is to measure peak draw, not just typical running draw. And then add a 20% buffer (or more if desired, depending on planned future growth).
I would login to iDrac and see what the usage is like, get a good months average. Take that info and add 30% for error and overhead/spikes/growth. You can then take that number and plug it into Eaton''s calculator. You can select how long your run time requirements are and so on.
Use Eaton''s UPS Selector tool and Calculator to choose the right UPS, Uninterruptible Power Supply for your needs. Load Calculator, Replacement Battery Tool
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