Q&A: I need to run 4 security cameras in a place that has no electricity. How long will a UPS last?

Question by yeahbaby: I will need to run four safety cameras in a place that has no electricity. How long will a UPS last?
I want to run 4 Cameras into a DVR for a couple of hours.

The cameras are rated at 12v

Electrical power Usage: 500 mWatt
Existing Consumption: 500 mA

The UPS I am hunting at has the subsequent ratings for electric power:

Power Description
Load Ability:
350VA/180W
Input Voltage:
110V AC
Input Voltage Range:
120V AC Single-phase
Output Voltage:
120V AC Single-phase Nominal
Frequency:
60Hz
Current:
15A Line mode
Waveform Type:
Pulse-width Modulated Sine Wave
Surge Electricity Rating:
380J
Filtering:
EMI/RFI


How prolonged could I run those four cameras for?


Best response:

Response by ABdA
Commercial UPS are typically developed to final five a long time
Industrial UPS up to 20 many years
http://www.solidstatecontrolsinc.com/techhpapers/papers/comm_vs_industrial.html
The warranty (usually for spare areas) for your specified UPS really should also kind the basis for the support lifestyle.

Refer also to this superb UPS write-up "ten points you really should know about deploying a UPS" by Erik Eckel
http://posts.techrepublic.com.com/5100-10878_eleven-6085460.html
relating to concerns on the deployment. You only gave the UPS ratings and the specifications (consumption and voltage) for the digital camera, but you forgot the desire factor for the cameras.
http://www.nfpa.org/property/files//PDF/necdigest/CodeIssues072704.pdf

Even though you specified that the 4 (four) cameras will operate for a "couple of hours" but you forgot to give specification (specifics) of the DVR, which I am assuming, would also be related to the UPS. Devoid of these data, a particular computation on how long would the UPS last can not be objectively manufactured.

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