Anyone else's Victron MPPT acting daft after the firmware update?

Rolled out the v3.20 firmware on my SmartSolar 100/30 last Tuesday and now it's throttling back to about 40% output on perfectly clear days — sitting at 180W when my two 200W Renogy panels should be pushing closer to 320W in this weather.

Checked all the usual suspects: connections clean, battery absorption voltage set correctly at 14.4V for my Fogstar 100Ah lithium, nothing obvious in the VictronConnect logs except it keeps flipping between "Bulk" and "Absorption" every few minutes like it can't make its mind up.

Tried a full reset to factory defaults and reconfigured from scratch — made absolutely no difference, still throttling like it's running on half a brain cell.

Anyone seen this after v3.20, or have I just got the world's most indecisive MPPT keeping my garden office on life support?

@GrumpySpanner had almost identical grief with my 150/35 back when v3.17 dropped. Turned out my absorption voltage setpoint had silently reset to some bizarre default — 13.8V on a 24V bank, which made the controller think it was perpetually in float. Spent two days convinced the panels were dying before I spotted it in VictronConnect.

Worth pulling up your battery settings screen and comparing against what you had before the update. The v3.20 changelog does mention a "profile migration" during first boot post-update, and I suspect that's where things go sideways.

Also check your temperature compensation offset — mine zeroed out completely. With my Fogstar Drift LiFePO4 cells that didn't matter much, but on AGM it'd absolutely throttle you back on a cold morning.

Factory reset with a manual reconfigure sorted mine completely.

Hey @GrumpySpanner, worth checking your temperature compensation settings if you haven't already — after the update mine had reset the battery temperature coefficient to a daft value which was artificially capping the charge voltage and knocking output right back. Also, have a look in the History tab on the VictronConnect app and see if it's logging any "low battery voltage" warnings even when it looks fine on the main screen. Sometimes the new firmware is stricter about what it considers a legitimate bulk charge condition. If you're running without a VE.Smart network or temperature sensor, try temporarily setting compensation to zero and see if output improves. Let us know what your panel Voc is reading too — would help narrow it down.

Rolled back to v3.19 on my shepherd's hut setup faster than you can say "warranty void" — Victron's own community forum had a sticky about v3.20 playing silly beggars with the BMS communication protocol on certain Fogstar Drift batts, which then confuses the MPPT into thinking it's protecting something that doesn't need protecting.