Daily pv production

I had the same issue with a Solis inverter and a twin Puredrive battery setup on days with intermittent strong sunshine. I raised tickets with both companies, and eventually told my installer what to go do with himself as he hadn't s clue, and was far more concerned with how I was noticing the system was constantly tripping out on a battery overvolt fault..... The issue was the default settings for that battery make stored in the Solis inverter aren't correct. For twin setups, the overvolt is set to 60 Volts default in the inverter, I lowered it to 58.5, I haven't had the issue since.

This may not be your issue, but it's worth trying.

No problem. It will be in advanced settings, you'll need a code to access them. The manual online will help. Most battery settings are controlled by the BMS, but undervolted and overvolt can usually be be overridden manually on most inverter models.

You also have a very large installed capacity for one inverter, particularly for just one 5kW inverter. This is likely contributing to the issue, as there will be huge surges in DC string voltage when the sun suddenly peeks out from behind the clouds, which the inverter is likely struggling to deal with. A slow buildup is fine, but to go from very low generation, to full in a slit second.... I would say the combined voltage on those strings could be very close to, or exceed the inverters tolerances. I'd have to read the tech specs to be sure.

9.3kWh today in South Dublin. 6.35kwp East-West array.

Ended the day with 8.3kWh from 6.5kWp E/W. There was a few short periods of sunshine but for the most part thick clouds. The generation surprised me as for the most part the day looked just as cloudy as the weekend.

Tues 10.92 kWh, Weds 8.21 kWh, Thurs 8.84 kWh

7.8 kwp, South Facing, Meath