UPS Backup

[Waffen06]

I found a couple posts on this but hope someone can help me figure out the numbers. After waking up to our 3rd power outage in 4 months Id like to get a UPS for one of my pumps. Cant decide if I should run my sicce 2.0 (says 35 watts) or one of my powerheads a tunze 6040. Anyways if the numbers on a UPS says:
650 volt-amperes
360 watts
490 joules
Which number do I use to calculate for example how long it would typically run my sicce 2.0? Or am I missing the number I need? Thanks
Theres another one:
450 volt-amperes
260 watts
890 joules
Is there a formula to use?

 

[Cell]

Cant help with the calculation, but I think most UPS units are built to give you time to save files before your computer shuts down, not to serve as a long term power source. Perhaps consider a generator instead, way more bang for your buck, I think.

 

[Waffen06]

Unfortunately I dont have a garage or place to keep a generator at the moment. Plus 2 of the outages I was not home for.

 

[r20crazy]

there is no real exact formula as brand/batteries used play a large role. if u are looking at a specific UPS model, most manufacturers have charts online that show how long you can expect it to run on a given watts load.

 

[Cell]

How long does your power usually go out for? If just an hour or two, then a UPS with just a single pump would be sufficient. I would just get the largest one I could afford.

watts/12 = amps
battery capacity/amps = run time

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[William Robinson]

I found a couple posts on this but hope someone can help me figure out the numbers. After waking up to our 3rd power outage in 4 months Id like to get a UPS for one of my pumps. Cant decide if I should run my sicce 2.0 (says 35 watts) or one of my powerheads a tunze 6040. Anyways if the numbers on a UPS says:
650 volt-amperes
360 watts
490 joules
Which number do I use to calculate for example how long it would typically run my sicce 2.0? Or am I missing the number I need? Thanks
Theres another one:
450 volt-amperes
260 watts
890 joules
Is there a formula to use?

Amps. How many amps is the battery? I can figure this for you. Also the power source if you have a brand selected so I can calculate the efficiency of the battery type. Sicce will be an estimate but I will try to go on the high side as in worst case.

 

[cyanidedelirium]

To your volt amp (va) is their equivalent to mAh basically you get about a 75 min at 35 Watts on 650 VA typically these are designed for two things brownouts which is where the power just drops partially which can fry a computer and blackouts so that your computer can shut down properly so they're only really designed to have a computer run 5 to 10 minutes while shutting down however was such a light load they can run a pump and a heater for quite some time I would suggest a company called APC you can go on their website and enter the amount of Watts and it will tell you how long the power supply you looking at will run

 

[Waffen06]

Thanks, my work gave me an old APC that they dont use anymore. Ill get it home and see if it still works and what size it is