Got this UPS for second time. First time the batteries were dead (vary badly bulged) so I recommended getting new ones. It seemed to be the only problem, but after couple of days it was supposedly found with disconnected load and all of the lights blinking simultaneously.
I found it means internal problems, usually relay or FET going bad. Well, I have only weak batteries here (already weared-out 5Ah), I tried testing it with 100 W and nothing interesting happened. Will try wiring another two in parallel so it can work slightly longer.
But I won't say it's would be relay or FET, it would not work at all like that, whaddaya think? I have load of 4 LEDs out of 5 (~800 VA) on AC power ATM and it seems to work as well.
Now I wired the extra batteries (so I have two in series for 24 V, and another two hooked to them in parallel) and will charge them with light load only. Than as they get charget I will try to increase the load to 800 VA and run on the batteries to see whan happenes.
I found it means internal problems, usually relay or FET going bad. Well, I have only weak batteries here (already weared-out 5Ah), I tried testing it with 100 W and nothing interesting happened. Will try wiring another two in parallel so it can work slightly longer.
But I won't say it's would be relay or FET, it would not work at all like that, whaddaya think? I have load of 4 LEDs out of 5 (~800 VA) on AC power ATM and it seems to work as well.
Now I wired the extra batteries (so I have two in series for 24 V, and another two hooked to them in parallel) and will charge them with light load only. Than as they get charget I will try to increase the load to 800 VA and run on the batteries to see whan happenes.
Half of the computer problems is caused by bad contacts 
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