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# How to calculate battery backup time with 80% load with 10 kva ups

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Depends on battery load in kve. It had better be less than 10 KVA or you won't be backing it up , only extending the time untilthe battery is discharged. But to really answer the question with atime as you request you need to specify the battery capacity on kvahours.

Posted on Apr 18, 2017

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Posted on Jan 02, 2017

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If the Galaxy 3000 is a 10 or 15 KVA UPS, you need 20 batteries of the 12v 20ah if the UPS has standard backup time.
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Talking about the 20 or 30 KVA UPS, if the battery is 34ah, it uses 24 batteries; in any other case it uses 20 batteries.

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If you have access to a large enough solar system, then as long as there is sufficient power from the inverter, it will work as the UPS will consider it is being powered by a mains source.

The amount of power you will need from the SS will directly depend on how much load you have on your UPS.
Remember that you will need enough power from the SS to drive the
1) UPS electronics
2) UPS battery charger

Hope this helps,thanks for using FixYa

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Here is a link to a website with some useful conversion script

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

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.

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