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Fivealive

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  1. Fivealive

    Advice on UPS backup power supply - DVR & 8 cameras

    UPS labels will always state KVA and KW and they will be slightly different. UPS are usually marketed in their KVA rating however The KW rating (which accounts for losses ie power factor) will be the one to use for your loading requirements. Typically small UPS have PF at 0.8 though can range from 0.6 to unity. So a 1kva UPS with PF of 0.8 will have a maximum load capacity of 800w (0.8Kw) Battery AH is the rating that the battery should be able to continuously supply exactly for 1 hour - Which doesn't mean or help most that purchase UPS UPS will usually state the full load runtime of the UPS on batteries, which Typically on a small UPS is usually all that is required Often UPS are specified by consultants, which in reality means we calculate the battery requirements for a specified runtime at a specified load. If this runtime is to be required at end of life of battery, the industry standard is to add on another 20% for battery deterioration. Hope this helps :0)
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