20 Most Recent Powerware 3110 UPS System Questions & Answers

This could be several things, fortunately the device should actually be helping you to diagnose the issue. There are different beeps for different issues. They are as follows:

1 Beep Every 5 Seconds = Power Outage\Loose Plug Connection\Tripped Circuit Breaker\Power Cord Damage or Failure

2 Beeps Every 5 Seconds = Low Battery Alarm

3 Beeps Every 5 Seconds = Battery Needs Charging\Service\Replacement

3 Beeps Every 5 Minutes = The Battery is discharged and battery power is unavailable (If this continues battery replacement may be necessary)

1 Beep Ever 1/2 Second = Power Requirements exceed the UPS Capacity (remove some equipment to lighten the load on the unit)

Continuous Beep = Short Circuit / Input Voltage out of Range / UPS Fault (Likely replacement of entire unit)

That should help diagnose the actual issue. If it turns out the battery needs to be replaced they can be found online for around $20. A simple google search for Powerware 3110 Battery should return what you're after. Good luck!

if the batteries were left connected the batteries will slowly discharge

Sounds like it is not regulating the voltage and current charging the batteries. Consult a service manual to look for a repair method.

Check the manual - https://powerquality.eaton.com/products-services/legacy/9120-info.asp?act=smtc&id=&key=&Quest_user_id=&leadg_Q_QRequired=&site=&menu=&cx=3&x=8&y=6

It either means the ground wire in extension cord is not there or is open. It could also mean that the outlet wasn't wired with a ground back to the panel.

plug it in

fixya has nothing but advice go google and type the details in the search box

can blow diodes in the alternator and ECM

You can check the battery fuse or the charging fuse. If it's more then that it's going to be a very costly fix.