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Am I missing something here? It seems like all UPS models are very clear about the VA, which I understand to be amount of power / watts the device can supply, but this doesn't give any indication of runtime. The Ah (ampere-hours) of the battery should reflect the amount of power stored in the battery, but it isn't even listed in many of models specification sheet.
I'm trying to buy a UPS to power my network rack for as long as possible. The wattage isn't huge, maybe 200 at peak load, but I'd like it to run as long as possible in an outage. Some brands have a "runtime calculator" for each product, but many don't. Is there an easier way to determine runtime? Or am I incorrect in my interpretation of the power units?
Thanks.