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Author Topic: Using an APC Smart-UPS 700 and 1400 as "inverter on demand."  (Read 7999 times)
w0067814
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« Reply #15 on: December 22, 2012, 08:12:18 PM »

Jus to say that I have a smart ups 700XL connected to a 24v 150ah bank (4 off 12v 75ah gels) and everything works just fine. I can run a 300w load for over 8 hours before shutdown occurs. Black start is fine too.
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biff
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« Reply #16 on: December 23, 2012, 12:45:54 AM »

w0067814,
             Intresting post.running a 300watt load of a 150ah x 24v bank for 8 hours must be a bit of a record.Perhaps the batteries are newish but They have not been doing this for very long nor will they be doing it for much longer. Sad.
        Draining them down like that is just killing them,You are only supposed to take 12% and try and avoid going below 12.4/5 volts.
                                                               Biff
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marcus
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« Reply #17 on: December 23, 2012, 06:06:40 PM »

...or he could be doing it whilst the sun's shining/wind blowing/ water flowing - so, technically running off the power source and not the battery?
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w0067814
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« Reply #18 on: December 23, 2012, 08:13:12 PM »

It's a ups running computer servers rather than anything off grid. They've only seen any decent capacity taken out of them twice. Batteries are specified for over a hundred full discharges, and close to a thousand for small DOD. Realistically it is rare to have a power cut lasting more than an hour, but I got the batteries new unused for 30 so a bit of a no brainer.
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