Cyberpower CP900EPFCLCD UPS not charging

[luca773]

Hello,
I have a problem with a Cyberpower CP900EPFCLCD UPS unit that seems not charging the battery.

With AC power connected I measure 13,50V on battery terminals.
If I unplug AC cord, voltage drops below 10V after no more than 30 seconds causing UPS to shut off.
I'm testing with a load of 20W.

Plugging AC power again UPS turns on and battery charge level indicates 100% (even if I disconnect battery!!!!).

Tried with new battery same behaviour.

Therre is no sign of blown components. Could you help me troubleshooting this issue?

thanks in advance

[petehall347]

Re: Cyberpower CP900EPFCLCD UPS not charging

13.5 should charge the battery .. 10v is low . test the battery . or leave to charge overnight and then test . even new batteries can be bad .

[luca773]

Re: Cyberpower CP900EPFCLCD UPS not charging

I really do not understand, I tried with another battery pulled out from another ups.

If I power on UPS whithout battery, it shows 100% charge level (?!?).
With AC power: 13,6V on battery and current flow of 0.5-1A.
On battery: voltage holds above 12V for 30 seconds then drops quickly below 10V and UPS shut off.

I've just ordered another battery to test tomorrow.

[petehall347]

Re: Cyberpower CP900EPFCLCD UPS not charging

does it get full voltage and good sinewave at the outlet ?

[luca773]

Re: Cyberpower CP900EPFCLCD UPS not charging

voltage is correct, sinewave I'm not able to check but I tried to power an active pfc psu so I presume is good.

[sam_sam_sam]

Re: Cyberpower CP900EPFCLCD UPS not charging

To me this would indicate that you have a bad battery or you have a severe over current condition on the primary side which is the battery side and the secondary would be the 120 volt ac side when you are on battery
power

[luca773]

Re: Cyberpower CP900EPFCLCD UPS not charging

just an update. It was a bad (new) battery.

[petehall347]

Re: Cyberpower CP900EPFCLCD UPS not charging

well done ..i like the easy ones