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24 volt LifePo4 system with giandel inverter intermittent failure

gives11

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setup my system following will prowse 24 volt system:
giandel 2000 - 4000 inverter
renogy charge controller 40 amp
2 x 200 watt solar panels in series to give 600 watt
2 x LifePo4 battery setup in series to = 24 volt

My system seemed fine for about a 40 days and then the inverter cut out and wouldn't restart. Much fiddling without changing anything specific it would restart.

tried the long press 3 second & starting with load switched on eg hairdryer

Ive been in touch with giandel and don't understand the response.

Any suggestions please?

I'm not in my home country or I'd be sending the inverter back where it came from.

"reply from giandel:This LifePo4 battery has BMS protection function, the working range of this LifePo4 battery is 10-14.6V (20-29.2V), and its high voltage protection voltage is relatively low, only 14-14.6V (28-29.2V).

So we susupet this is because your battery is in protection but inverter in normal working condition, battery was automactially shut off, inverter had no backup power and then turned off. And after several hours battery dischrged to working condition, inverter can be turned on again.

This inverter High Input Protection is at about 32v. Please check if your battery protection voltage setting is too low. And please do not use inverter while battery is charging. When battery is charging, battery has a virtual voltage to inverter and make inverter goed into High Input Protection more easily."
 
setup my system following will prowse 24 volt system:
giandel 2000 - 4000 inverter
renogy charge controller 40 amp
2 x 200 watt solar panels in series to give 600 watt
2 x LifePo4 battery setup in series to = 24 volt

My system seemed fine for about a 40 days and then the inverter cut out and wouldn't restart. Much fiddling without changing anything specific it would restart.

tried the long press 3 second & starting with load switched on eg hairdryer

Ive been in touch with giandel and don't understand the response.

Any suggestions please?

I'm not in my home country or I'd be sending the inverter back where it came from.

"reply from giandel:This LifePo4 battery has BMS protection function, the working range of this LifePo4 battery is 10-14.6V (20-29.2V), and its high voltage protection voltage is relatively low, only 14-14.6V (28-29.2V).

So we susupet this is because your battery is in protection but inverter in normal working condition, battery was automactially shut off, inverter had no backup power and then turned off. And after several hours battery dischrged to working condition, inverter can be turned on again.

This inverter High Input Protection is at about 32v. Please check if your battery protection voltage setting is too low. And please do not use inverter while battery is charging. When battery is charging, battery has a virtual voltage to inverter and make inverter goed into High Input Protection more easily."
Lets check to see if your BMS disabled the discharge fets.
Please provide a product link to your battery.
Does the bms have a bluetooth app so that we can see its run-time state?
 

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oh. I'll see if I can see that. not sure how but we got blue tooth versions.
 
I meant the Bluetooth interface to the battery management system.
Your picture is of the battery monitor.

We want to see of the discharge fets are open when the inverter is failing.
Downloaded the app. is this what you needed to see rather then the bms?
 

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these are 12v battery set up for 24 v.
 

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See the red bell on the first screen cap.
It looks like you have had a protection event.
Please try to drill down on that.
 
See the red bell on the first screen cap.
It looks like you have had a protection event.
Please try to drill down on that.
By drill down I meant click on the alarm and see if it expands to tell you the details of the alarm.
 
By drill down I meant click on the alarm and see if it expands to tell you the details of the alarm
it doesn't click and open up anything. So I've emailed the contact at the battery shop (ultramax) for info.

The bluetooth app needs passwords and the serial number should be the password but it doesn't work.

So I need to disable the battery protection at the battery level?
I'm confused with 12 volt battery operating in series as 24 volt how do I set parameters on each battery?

I'll get back to you. thank you for bearing with...
 
it doesn't click and open up anything. So I've emailed the contact at the battery shop (ultramax) for info.

The bluetooth app needs passwords and the serial number should be the password but it doesn't work.

So I need to disable the battery protection at the battery level?
Lets find out what alarm even the battery is reporting.
Then we can decide how to proceed.
My suspicion is that the event is either cell under-voltage or pack over-current.

I'm confused with 12 volt battery operating in series as 24 volt how do I set parameters on each battery?
Each battery should have its own management interface.
 
photo of my setup ( slow Internet on top of battery issues - cry me a river)
 

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