My ups does its regular self test and one morning the UPS was beeping with a replace battery warning light.
I performed a manual test and that was ok.
The batteries are quite a few years old so I thought I would replace them anyhow.
Anyhow before the new ones arrived I had a brief power outage (less than 1 second) and the UPS did not kick in correctly.
a day later we had a planned power cut and with a very light load the the backup battery lost power after 5 minutes and shut the UPS down.
As the new batteries had just arrived, thought would change them over.
Once the batteries were charged and left for 24 hours I was still getting the "all lights flashing" every 30 minus or so which I believe indicates batteries needs calibrating.
However I did a self test which went ok but afterwards the battery level was showing min on new batteries.
I am a little concerned that the new batteries might be defective or is it just a case of calibration needed ?
Hi Robin, definitely worth running the calibration with the new batteries as the ups processor that calculates runtime can lose its mind sometimes and report unrealistic runtimes.
One thing to check is the serial number of the batteries you’ve been supplied. Ignore the first two digits and the next two indicate the Year and the following two indicate the week of the year. Eg
AS1920... this would mean the product was manufacturers in 2019 and 20th week of the year.
This is worth checking in case you’ve been supplied old batteries.
Thanks, I will try to do calibration today once I have found a suitable load to put on it.
The new batteries were both made this year so that was worth checking.
ok, calibration done.
Just waiting for batteries to recharge.
ok, did calibration the other day.
Unfortunately the lights are still flashing in unison every few minutes for about 10 flashes.
If anything the time between the flashing has reduced from around 30 minutes to a couple of minutes.
The good thing is it did hold up a 400w load for about 10-15 mins.
Any ideas on the flashing ?
Yes I did a manual calibration at weekend.
I was struggling to find a suitable load but I found a power tool that did not vary too much in power taken.
Still the same.
Hi Robin -
You can either run the manual calibration again (sometimes it takes more than once) or contact tech support for further assistance. If by any chance you are not using any shutdown software (like Powerchute Business Edition) this issue is purely cosmetic and will not affect your actual runtime.
Tried again, though I was unable to fully complete procedure it did clear the flashing LED lights.
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