On 12/11/13 16:44, steve-ALUG@hst.me.uk wrote:
On 12/11/13 09:31, Mark Rogers wrote:
On 11 November 2013 20:30, steve-ALUG@hst.me.uk wrote:
The lower the load, the longer the battery life. The higher the VA rating, the longer the battery life.
At least as I understand it, VA doesn't give any indication of battery life, and it's quite common to find cheap UPS's differentiating themselves on VA rating (1500VA is bett
750 VA means it can deliver 250V at 3A. If your hardware needs 4A the UPS will fail to provide it and presumably go overcurrent and shut down. Whether it can provide 250V at 3A for 5 seconds or 5 hours is immaterial. So, for the same load, a 750VA UPS and a 1500VA UPS will last just as long (assuming all else is equal), but if you have a 4A load the former will fail to work at all where the latter will.
Really????
IMO, provided that you're not trying to draw more current than the UPS can provide, a bigger VA rating means a longer battery life.
AIRI that was the point: if the UPS is rated at 3A, it will not deliver 4A (for long). It's not the UPS per se, but the inverter in it that matters in this case.
Otherwise - I can't argue.