Why is my setup failing?

[bigote]

Hi everyone, I hope somebody can help explaining what is going on with my setup.
I have a jinko JKM260PP-60 which is a 260 W panel, I have verified it to produce 30 volts at 8 amps, I have it hooked to a 20 Amp mppt charge controller which is connected to 2 NORTHSTAR NSB190 batteries connected in series to make 24 vdc.
Hooked to these batteries I have a APC SMT-750 UPS which powers a small HP server which according to the ups is pulling 35 W total power.
it was my expectation that I could ideally run this load literally all day as long as the sun was shining, but in my testing after about 1 hour the batteries start to go down, this is surprising to me since I expected the panel to produce enough juice to run this small 35W load + the UPS of course but still...
I'll appreciate any input on this matter.
Thanks

[littleharbor2]

Well the fact is that panel is not a 24 volt nominally rated panel 60 cell panels are typically considered 20 volt nominal and during the middle of the day when the sun is on it warming it up it likely isn't producing enough voltage to make your charge controller happy.

Go to your charge controller in the middle of the day and see what kind of power your controller is putting out charging your battery if at all.

[bigote]

Hello again, and sorry for the late response but apparently we're on different continents. anyway you're probably right perhaps using 2 of this in series could work better.
But I now have bigger problems, trying to do a short circuit current check which I read on many sites to be "safe", I managed to ruined this panel. during the test it did produced 7.8 A
but in the process scorched one of the cells.
The panel still produces 32 volts in open circuit but I'm afraid the panel is now permanently damaged.
This is what it looks like.

[littleharbor2]

yikes! You certainly did cook that one cell that's a bummer. you should be able to short circuit a single panel without damaging it at all. I don't know what happened there but it does not look good.

As to series wiring your panels yes that's the answer make sure your charge controller can handle the voltage and then is in fact an MPPT controller

Can you give A brand name and model number or a picture of your controller 20 amps a small number and I know there's a lot of fake MPPT controllers out there.

[bigote]

While the UPS was disconnected from the grid, the charge controller reported 3 amps being downloaded but at the time I thought it was what the load was consuming.
This is the controller I have, no idea if fake but I had it for about 3 years with no issues.
Epever tracer 20 amp.

[littleharbor2]

OK the EP ever charge controllers or either 100 or 150 volt, open circuit limited so you should be able to take two of those panels and wire them in series and get the proper charging.

[bigote]

Great, I'll give that a try and will report back. Thanks alot for your input. Best regards...