Smart Solar MPPT100/20; the solar MPPT output fails to track the incoming solar irradiance on occasions and takes a while to recover and return to normal operation.
I was watching the MPPT behaviour during the mostly sunny day (as can be seen by the Grid PV inverter data) but then the occasional cloud dropped the solar irradiance the Victron Smart Solar stopped being smart, got confused and dropped its power output to near zero even after the solar irradiance had returned.
My grid inverter had a small drop in power output for a short time but the Smart Solar MPPT100/20 took a while. On the second occurrence, I needed to isolate and reconnect the PV breaker for the Smart Solar to start to work again. Note the first dip in output power in the afternoon, on the grid Fronius Inverter a very slight dip in power, while the smart solar's output dropped very significant. The second major dip in power output I was watching and was when that I needed to turn the PV breaker off and on to get the smart solar back working. It does seem that major changes in solar irradiance (which is normal) causes the MPPT to get confused, it does get going again without any intervention but with the penalty of some loss of charge energy compared to the Fronius Galvo 2.0 inverter performance. The data for both systems was using a Venus GX, logged setting 15 minutes.
I hope this gives sufficient information to be able to find the cause of the glitch in performance.