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Forum Discussion
Help on UPS Sizing...
I would like some help with understanding if my existing UPS will safely support the load I am wanting to put on it. I curently have an APC Back-UPS ES 750: http://www.apc.com/resource/include/tec ....
You are operating on the edge. The NV should have a 200W PSU and the Pro is listed as having a 300. That is a potential of 500 Watts through the PSUs of the two units and the Backups ES 750 is listed at 450 Watts. I think the load of the GS108 is negligable and we know that idle the NV and Pro combined have a listed draw about 55W for the NV and 83 for the Pro (with 500GB drives). Increasing the drive size will raise it a little but not a great deal.
Assuming the PSU is sized with a 100% overload factor you would get 100W for the NV and 150W for the Pro at max. for a total of 250 Watts.
I have a Backups NS1250 which is a 750 Watt unit. I have 2x NVX, 1X NV+, a GS108 and a computer (C2D E6750 with 4GB of memory and 2HD) and a 24" LCD monitor attached to it. I have not really calculated the load, but it has handled this load for a year now without complaints or getting overly warm. (Adding up the 4 PSU sizes I get 200+220+220+550=1190). When I hover over the RAIDar UPS icon on either NVX, it tells me I have 13 mins of runtime. The UPS is about 4 years old and has the original batteries. I just replaced the batteries in an identical unit in the LR that is actually several months newer when I got a warning from the unit the batteries were worn out. I would imagine I need to replace these as well.
If it were me, I would get everything set up and running, and then look at the icon in RAIDar and see how many minutes you have. Then you can decide whether to add a second unit, or replace the ES750 with a larger unit.
Assuming the PSU is sized with a 100% overload factor you would get 100W for the NV and 150W for the Pro at max. for a total of 250 Watts.
I have a Backups NS1250 which is a 750 Watt unit. I have 2x NVX, 1X NV+, a GS108 and a computer (C2D E6750 with 4GB of memory and 2HD) and a 24" LCD monitor attached to it. I have not really calculated the load, but it has handled this load for a year now without complaints or getting overly warm. (Adding up the 4 PSU sizes I get 200+220+220+550=1190). When I hover over the RAIDar UPS icon on either NVX, it tells me I have 13 mins of runtime. The UPS is about 4 years old and has the original batteries. I just replaced the batteries in an identical unit in the LR that is actually several months newer when I got a warning from the unit the batteries were worn out. I would imagine I need to replace these as well.
If it were me, I would get everything set up and running, and then look at the icon in RAIDar and see how many minutes you have. Then you can decide whether to add a second unit, or replace the ES750 with a larger unit.
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