Hi there,

 

I have a Kodak 7.2 inverter with 3 x US2000 and 1 x US2000C Pylontech bank and 2 x Pv arrays.

 

System has been running stable for over a year. Yesterday the batteries all went into alarm and the inverter is no seeing them. Restarted them and same problem.

When I open the fuse link and start the batteries they are fine, as soon as I close the fuse link there is like a trip sound inside the batteries and they all go into alarm mode.

The inverter does not show any alarms and the 220 and PV side is working 100%.

 

I tried opening but seems the DC/DC pc board terminals is directly connected to the mainboard - is this a mainboard failure? Any other ideas to fix this and what will cause this from happening? 

Edited September 12, 20232 yr by Boela

Have you tried removing one battery at a time to see if its all of them or just one?

Like I said, if I open the fuse link the batteriea start up fine, as soon as I close the link they trip. Disconnected all of them and started them individually, no issues, as soon as they connect to inverter their is like n tripping sound coming from inside the battery and it goes in to ALM mode

So each battery is failing with the same sound? Are the cables between  batteries disconnected when you do the test?

Correct, all cables disconnect.

If you power the bank as a whole, they start up, if you power them individualy they start up, if you close the fuse, they trip

Can you measure a voltage from the batteries with a multimeter ?

If I measure at fuses they are on 52.4v

If you have access to BatteryView you could see why the batteries are going into alarm state. You will need a rs232 to usb cable....

Might at least show you what the issue is..

Thanks will google the software and get a cable

 

If I measure at fuses they are on 52.4v

Ok thats good , i agree with @FixAMess Batteryview will show you what alarm is happening at the time. Hearing a sound from the batteries is concerning though ,hopefully they are not being shorted out.

Can this come from the inverter seeing that with the fuse link open they are fine?

 

Can this come from the inverter seeing that with the fuse link open they are fine?

It does seem like its a fault with the inverter , if you can measure voltage at every battery's terminals and the 'run' light is flashing on every battery with no alarm light on its most likely not a issue from the batteries.

Thanks - will send inverter in for repairs as I suspect the same