Not charging battery Backups pro 1500

[Anonymous user]

Ok so everything was normal i connected the ups to a power source and then bam i hear a voice in the background not from the ups and the general power just goes off, my ups protects the pc i had connected to it but when i restart the ups it doesn't recharge the battery, could anyone help a novice out

Thanks

[BillP · Accepted solution]

Hi,

Try resetting the UPS

 1: Disconnect any attached load.

2: Unplug the UPS from the wall socket.

3: Disconnect the UPS' internal battery.

4: Push and hold the "On" button on the UPS for 5 seconds

5: Reconnect internal battery.

6: Plug UPS in to known good power source.

7: Turn UPS on.

If it still will not charge after the reset that would indicated the charging circuitry took a hit during the power outage and the UPS should be replaced. 

[rafaelmota]

I have the opposite need. I'd like to disable the battery charger, because Im using lithium batteries and have an external charger, SUA1500.

[samarasg]

use a diode on the main DC+ cable. Although getting the Voltage right is tricky. Eg. if instead of lithium you had lead acid with V = 12.7V, diode forward voltage drop would be 0.7V -> ups would read 12V out. Also the amps are huge in a UPS, you need huge diodes. IDK if you need to have lithium charger constantly connected to batteries , maybe you need ac isolation transformer in charger AC side, bonding charger/ups dc- battery bus, etc. I ain't a EE. It would be better recreating a solar system -> inverter, charger, battery with AC input /grid vs buying a UPS or doing shady mods especially when you lack necessary knowledge