AC voltage drops on Deye 8k and F34 error

[Rybue]

Hi guys!

I have setup with 16x550W panels + Deye 8k invertor + connected to the grid.
Everything works as expected but multiple times during a day I receive F34 error. During this errors, nothing is running from Deye invertor, maybe 200-300W are used.

What I noticed, is that when this error happens, Deye AC voltage drops to something around ~50V.
Also, it seems somehow to correspond with grid outages that we have(I'm from Ukraine, Kyiv, so it's a bit unstable right now).

I added graph, with this drops. If you would need more info, let me know.

If you could help me with some advice or where too look at, I would really appreciate it!
And sorry for language mistakes, I'm not a native speaker.

 

[Rybue]

Additional information - looks like DC voltage also drops during this errors

 

[myles]

First off. Sorry for the world and it's problems.

Secondly. Can you run off grid do you have batteries?

 

[Rybue]

Hi!

Yes, I have batteries. It's DIY lithium battery, it works well with this Deye inverter.

 

[servis.prel]

Ask tech support to upgrade the inverter