Question about MGE Pulsar Ellipse 800 (89363) UPS System

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My ups is switching off itself immediately the mains goes off.the battery is okay with 13v.

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Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and enviromental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only a float voltage and a true indication of the battery voltage needs the batteries to be tested under a load. there maybe one battery that is faulty and causing the whole battery system to fail.
These lower powered and cheaper KVA type UPS are switch over types (when the mains fail, the UPS switches over to the inverter in milli-seconds to supply mains power). It is a possibility the inverter circuit is faulty and when the mains power fails the inverter does not switch over.

The true UPS type are usually the higher KVA units (over 1500 KVA units) that converts mains power continuously via the inverter circuit. The mains power charges the batteries and the inverter drawing power from continuously from the batteries (therefore there is no switch over time lag from the mains to the battery.

Posted on Sep 25, 2009

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The above mentioned is totally true. Bad batteries can register 13.2 volts but have zero capacity to store or deliver energy. I learned this the hard way last weekend when performing a power outage test. There was a bad battery in one of the battery strings, when the UPS needed battery backup, the bad battery prevented the whole string from delivering DC power to the UPS. The whole UPS crashed and all loads went dead.
The best tool is a 500 amp carbon pile load tester. It found the poor batteries instantly. Replaced the bad batteries and the system is 100% again.

Posted on Sep 17, 2012

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Just because the batt measures 13V does not mean that it is ok, this does not tell you the batt will deliver current, suggest try very small load eg 100Watt lamp. Unplug mains see what happpens if lamp goes out then new batteries I think.

Check manual and look at batt with ups sw.

Thanks for asking FixYA, hope this helps.

Posted on Sep 27, 2009

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