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Old 06-13-2009, 06:07 PM   #1
danjen10
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Motor Load and UPS Size/Type


Electrical Help -

What size/type) or brand UPS would give me about 15min run time for a 110w pump (rated 2.48a)? The pump is a Quiet One 5000.

I tried a 550va (330W) APC UPS and it overloads. I then tried a smaller pump on the same UPS and it will also overload. I tried a resistive aquarium heater (150W) and it worked perfectly. What type and size UPS will handle the inductive motor load? Thank you
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Old 06-13-2009, 08:55 PM   #2
Jadinop
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You may need a true sine wave UPS to run some brands of pumps. Some types of A/C motors do not work with the square wave that most inexpensive UPS put out.
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Old 06-13-2009, 09:19 PM   #3
danjen10
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I had considered that before I bought this one. I figured that if this one didn't work, I would just put it on my home PC. But, my problem is not that the pump won't run on the modified (square) sinw wave. It's that immediately when I pull the plug on the UPS, the UPS gives a high pitch, continuous beep. The manual says that this is due to an overload condition.

One person told me that the inductive nature of the pump may be the cause. I also have a few other pumps. The two small RIO pumps that I tried just stalled when I pulled the plug on the UPS. That's what I would have expected if the pump was not compatable with the UPS modified sine wave. I then tried a Quiet One 2200 (nameplate = <0.5 amp load) that I also have and it caused the UPS to beep and overload too.

I tried to call APC but they are closed. I'm tempted to get a bigger UPS but they start getting expensive to just "try out".

Anyone have any other ideas?

Thanks
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Old 06-13-2009, 09:52 PM   #4
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You are not understanding, the square wave is not allowing the pump to turn and it is appearing to the UPS that it is an overload. The pump is not truly overloading the UPS. It's not the size of the pump or the UPS that is the problem, it is the incompatibility between the pump and the square sine wave. It's the same problem, just different symptons between the two brands of pumps. Simply buying a larger UPS is not going to fix it.
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Old 06-13-2009, 09:58 PM   #5
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OK, thanks. Now I understand what you are saying. Thanks for clarifying. So, if I still want a UPS then it looks like I need to get one of the "true sine wave" UPS units.

Does anyone use one of these?
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Old 06-21-2009, 10:33 AM   #6
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FWIW --

I talked with APC and they told me that they also recommended the "true sine" model. I was able to find a new, overstocked SMART UPS 750 VA 550W. The SMART UPS is part of their line of "true sine" models.

This UPS is able to keep my Quiet One 5000 powered up for over 30 min on battery. I didn't wait for it to shut down. I'm guessing it had 5 - 10 more minutes in it.

Hope this helps anyone else thinking about using a UPS.
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