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The following page was printed from RemoteCentral.com:
| Topic: | Calculation for a UPS This thread has 10 replies. Displaying all posts. |
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| Post 1 made on Monday May 27, 2024 at 07:22 |
Gman Select Member |
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Posts: | February 2009
2,257 |
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Have a large Crestron job coming up with approx. 6 - 7 control processors, switchers and amplifiers. How do you calculate the size of
UPS needed for such a system? The generator kicks in after 4 minutes
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| Post 2 made on Monday May 27, 2024 at 09:56 |
PeterN Active Member |
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Posts: | July 2008
552 |
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Total load & runtime needed. Most UPS vendors have calculators. [Link: apc.com]
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| Post 3 made on Monday May 27, 2024 at 22:20 |
Trunk-Slammer -Supreme Loyal Member |
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Posts: | November 2003
7,489 |
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Not Panamax as theirs will not charge on gen power, and will just become a overpriced boat anchor.
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| Post 4 made on Tuesday May 28, 2024 at 10:48 |
highfigh Loyal Member |
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Posts: | September 2004
8,371 |
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On May 27, 2024 at 22:20, Trunk-Slammer -Supreme said...
Not Panamax as theirs will not charge on gen power, and will just become a overpriced boat anchor. Not even if the generator outputs pure sine wave?
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My mechanic told me, "I couldn't repair your brakes, so I made your horn louder." |
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| Post 5 made on Tuesday May 28, 2024 at 17:35 |
westcojack Long Time Member |
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Still no issue with Panamax, as the UPS will handle the 4 minutes.
I would add the total loads, add 20%, and run for 15 minutes or 30 minutes.
Don't cheap out on the UPS.
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Jack Goldberg, PE |
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| OP | Post 6 made on Wednesday May 29, 2024 at 06:40 |
Gman Select Member |
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Posts: | February 2009
2,257 |
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| Post 7 made on Wednesday May 29, 2024 at 08:21 |
Trunk-Slammer -Supreme Loyal Member |
Joined:
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7,489 |
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My personal experience with Panamax wasn't good.
That large and heavy 1500 was basically useless as while it would power the rack for a bit, when the gen was running, it wouldn't charge, so the beeping went on and on until the battery died.
I replaced it with three cheap Minute Man units and they worked perfectly, powered all the rack and a line to the display, AND charged from the gen set.
Batteries seemed to last just as long as the offending Panamax, which ended up in the scrap metal pile.
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| Post 8 made on Wednesday May 29, 2024 at 15:19 |
Brad Humphrey Super Member |
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Posts: | February 2004
2,644 |
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On May 29, 2024 at 06:40, Gman said...
The load is 7500 VA. Oof! That's going to set you back at least $15-20K just in the equipment - not counting accessories, wire & labor, electrician (unless you're a licensed electrician). Is this all in one location? How many circuits (and size) are there now? Is 240VAC available or can be pulled?
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| Post 9 made on Friday June 7, 2024 at 09:51 |
wildulmer Long Time Member |
Joined:
Posts: | June 2007
278 |
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I rarely use the UPS on amps, which saves a lot on UPS costs. If you have smart amps then that might not be an option. Look at your equipment and decide what needs a UPS and what does not.
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| Post 10 made on Friday June 7, 2024 at 11:42 |
highfigh Loyal Member |
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Posts: | September 2004
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On May 29, 2024 at 06:40, Gman said...
The load is 7500 VA. That's 7500VA for all equipment, but what's the power use for the amps in real time? Did you use the ratings on the equipment labels? I would measure the power used by each device (I have a Kill A Watt) and base the UPS on that, rather than a max use estimate. Not that I would want the system to draw too much, but in reality, you're not trying to power motors and pumps that are harder to feed.
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My mechanic told me, "I couldn't repair your brakes, so I made your horn louder." |
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| Post 11 made on Saturday July 20, 2024 at 03:38 |
Yes, not even if the generator outputs pure sine wave.
Last edited by Anastasiya on July 20, 2024 10:09.
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