On Sun, 23 Jan 2005 18:37:42 -0000, Coy Hilton wrote:
>Yep my Best Power UPS is the largest that they build that runs off
>13.8 volts it's a 1.4 KVA.
Hang on.....say you have a 1000 watt load on the UPS, that
means you have about 72.5A running from the battery(s) to
the UPS. Hope you have real big wires.
>I have a question, How long does the 4 33AH batteries last at what
>ever load that you have connected, and is it a fairly light load? It
>seems that they wouldn't last long with much of a load.
48 volts times 33Ah gives about 1584 Watt/Hrs of energy.
Theoretically, you could run a 1.5KW load for an hour, 750
watt load for 2 hours, etc., but due to efficiency, it will
be slightly lower.
Just to give you an example of run time, I had my hydro
panel upgraded from the old fuses to a breaker panel. The
electrician started at about 6PM, and it got dark about
8PM (late Fall). At 8PM he was half done and was trying to
work with a flashlight. I suggested we take the feed going
to the bank of 12 florescent lights and plug it into the
UPS. He agreed and after 1-1/2 hours later, he finished
the job and the lights were still going strong. The lights
take about 380 watts (12 x 32 watt bulbs).
One thing you have be careful when running florescent bulbs
is that they usually don't like running from a modified
square wave (the output of many of the low cost UPS's).
The Alpha unit has a monstrous output transformer that
creates a true sine wave output (in part, that's why this
thing is so heavy).
Tedd Doda, VE3TJD
Lazer Audio and Electronics
Baden, Ontario, Canada
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