Battery isolator trips - Sunny and exporting

Hi All
It has been very sunny these last few days (I know...I know...) and I have been on Flux exporting 1700-1900. The battery isolator has been tripping around 1830 for the last three days or so. It occurs when the solar array is exporting to grid around 1.7-2kW and I have the max exporting from my batteries at 3600W. I have 5kWHy Gen 3 inverter. I contacted my installer (who fitted my 3rd Gen3 GE battery!) who suggested that the grid voltage was getting too high - maybe due all this export (or maybe due to so many people in the street who also have solar arrays?). I checked the inverter voltage and it tripped around 248-250V and the inverter was max at 5000W. He suggested that I might mitigate this tripping by reducing the power output from batteries from 3600W to maybe 3400W...or maybe a bit lower (trial and error) while these conditions prevail. It seems to make sense to me.
What do team community members think?

Replace the trip switch. My installer replaced mine when I had similar issues.

AndyZ900rs Make sure the battery isolator terminals are all tight.

anthonypar thanks - will see

Windy Miller ok - thanks

First, grid voltage is nothing to do with the breaker tripping.

Second, have you been on Flux for a while? I might be interested in switching to Flux, but Octopus website says it's currently unavailable.

Third. How many batteries do you have? Is the tripping breaker on one of the batteries (the master?) or is it a separate breaker in it's own box.

Forth, reducing the discharge power is an excellent suggestion for now.

Rubikcube
Thank you so much Andrew
I have been on Flux since last April/May...but I have a heat pump and in January I was using so much electricity on Flux Import/Export that I moved to Cosy. Octopus however, left me on Flux Export which has great prices for 1600-1900 which times I have been using (now with long summer evenings). I read somewhere that I was not supposed to be on Cosy+Flux but Octopus seem to be OK with it.
I have three batteries - a newish (January) Gen3 which is now Master and two Gen1 batteries which are now S1 and S2. Originally The two Gen 1 had a trip switch (TS1) for (old) Master and a separate switch (TS2) for the S Gen1.
The new installer made (correctly) the Gen3 Master and connects via the TS1 (it is this one that trips!) and the gen3 connects to the "old" Gen1 batteries. I never had any issues with tripping until the sunny weather started.

I have turned the max power export to around 3300W - does this sound OK??

Rubikcube TS1 is a separate breaker in its own box (as is TS2). The Gen3 (as you know) has its own breaker on the side

AndyZ900rs
Andrew - this is what Geoffrey wrote back to me:

I would stop the force exporting to take advantage of the Flux peak evening rates because you can’t be on Flux export whilst on Cosy import.

Octoput are not OK with it, they just haven’t noticed - yet.

I had the same thing happen, I swapped from Flux to Agile and Octopus only changed the import tariff and left me on the Flux export tariff. Then about 6 months later they realised the issue, told me that I was on an invalid tariff combination and that its in the Flux terms and conditions that you can only get import and export as a coupled pair, and moved me back to standard (at the time) 15p export rate. And rebilled me for the entire 6 month period that I had been on the invalid tariff combination.
I did complain but the terms and conditions are clear about this.

And I’m not the only one, it seems this is a faulty in Octopus’s tariff switching that they don’t move the outgoing when you move off Flux, you have to manually request a move.

My advice is to tell Octopus the issue and get them to move you to either Agile Outgoing or Flat Outgoing (12p). They will catch up with you sooner or later and rebill you

AndyZ900rs Yes cosy and flux shouldn't be possible. Maybe if you switch to flux when it is available again you will get away with it.

The breaker is tripping because it is overheating with the sustained power. At nighttime, with the AC isolator off, the solar panel isolator off, and the battery off, check the connections are tight and that the ferrules have been fitted correctly.

Rubikcube thank you so much!