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Is this the sign that my Inverter Battery needs replacement?

patkim

Dec 7, 2017
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Hi All,
I have an Inverter device connected to 135Ah 12V Battery (Lead Acid) and AC mains input of course. It works fine when there's AC loss. It's set to UPS mode and hence my PC does not restart when there's AC loss.
Last few days I have observed a peculiar behavior
1. The battery is many a times in Charging mode. Even if it's consumed just for a minute of AC loss, the charging time is as high as 2 - 3 hours. Earlier it used to be hardly 5 minutes of charging if AC loss is just a minute or two.
2. Battery is noticeably warm to touch.
3. Even if fully charged and there's no AC loss, the inverter randomly starts charging it again for long period like an hour

The charging voltage is about 14 V and standby is around 13 V.
Inverter has never given low-battery indication yet

Are these signs enough to conclude that the battery is worn out? It's more than 3 years old and completely out of warranty.
Can a fault exist in Inverter circuit causing this behavior?
Thanks
 
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Bluejets

Oct 5, 2014
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It works fine when there's AC loss. It's set to UPS mode and hence my PC does not restart when there's AC loss.
These two statements contradict each other.

If you suspect the battery, take it to a repairer and get it tested.
 

davenn

Moderator
Sep 5, 2009
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I have an Inverter device connected to 135Ah 12V Battery (Lead Acid) and AC mains input of course. It works fine when there's AC loss. It's set to UPS mode and hence my PC does not restart when there's AC loss.

Apart from Harald's comment on your contradictory statement.
MOST UPS systems run the equip from the battery via the 12V to 240V (whatever AC voltage)
This solves any switching delays when AC power is lost to the unit.
This also means that the AC input's ONLY job is to charge the battery.

SO ....
you need to tell us the make/model of this unit so it can be established as to what way the unit operates.
 

patkim

Dec 7, 2017
11
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Well in my region for residential use it's not online UPS. It's an inverter that takes in 12V DC and converts it to 230V AC only when there's AC mains loss and there's a relay inside that triggers this switchover when there's Mains AC loss.
This device has two modes of operation UPS & Wide-UPS. In UPS mode the switchover is instant so PC does not reboot. In Wide-UPS it's bit slow, recommended when you have only low loads like lights and fans that don't care about slow switchover from AC mains to inverter and back to AC mains.

Probably it's all game of words here.

The device has two inputs 230V AC and 12V DC. When mains is ON inverter is not ON, when mains is down Inverter starts and generates 230V at its output which is routed to rest of the equipment's.

to get an idea how the system looks

https://www.amazon.in/V-Guard-Prime...d=1674986233&sprefix=inverter,aps,226&sr=8-14

above is the Inverter unit

and battery looks like this



These are indicative images as I could not find the exact match online
 
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