Anyone else finding Victron's new firmware updates a right faff to manage?

Just updated my Cerbo GX to v3.40 last week and now my MPPT 100/30 is throwing a low battery warning at 12.6v, which it never did before. Checked all the settings and nothing obvious has changed on my end. Running a 200Ah lithium setup with a Renogy 200W panel on the roof of my Transit conversion, been solid for nearly two years until this.

Tried rolling back through VictronConnect but it's not exactly straightforward — took me about 45 minutes of faffing before I gave up and just left it on the new firmware. The warning clears itself after a few minutes so it's not killing anything, but it's annoying and I don't want it masking a genuine fault down the line.

Has anyone else seen this after the v3.40 update, or is it something specific to the MPPT 100/30? Wondering if it's worth raising it on the Victron Community forum or if there's a simple fix I'm missing.

AndyReid | Posts: 847

@RobRobinson78 That's a known quirk with the v3.40 rollout mate. The Cerbo update can sometimes reset the battery voltage parameters on connected devices even when it looks like nothing's changed on the surface. Worth diving into the MPPT settings directly via VictronConnect rather than through the Cerbo interface — I found a discrepancy between what the Cerbo was showing me and what was actually configured on the device itself. Specifically check your "Low battery voltage" threshold under the charger settings. Mine had silently reverted to a default value. Also worth checking whether your battery type is still set correctly — AGM, lithium etc. — as that affects the warning thresholds. Victron's community forum has a thread about this specific issue if you want the full technical breakdown.

SarahLewis | Posts: 312

@RobRobinson78 Had something similar crop up after a firmware update a while back - worth double-checking your battery preset in the MPPT itself rather than just the Cerbo settings. Sometimes the two can get out of sync after an update and the MPPT reverts to a more conservative default profile. Connect directly via the VictronConnect app over Bluetooth and see what voltage parameters are actually stored on the charger itself. If you're running lithium, also make sure the battery type hasn't quietly switched back to AGM - I've seen that happen. @AndyReid is right that there are known quirks, but ruling out the direct charger settings first will save you going round in circles. What battery chemistry are you running?

HamishTaylor87 | Posts: 1,204

@RobRobinson78 Worth having a poke around in VictronConnect at the MPPT's own battery settings directly, rather than just through the Cerbo interface. I found after a similar update that the MPPT had somehow reverted to its own internal low voltage threshold rather than inheriting the system settings from the GX device. 12.6v sounds like it might be treating your battery as closer to empty than it actually is - that's roughly 50% on a lead acid but perfectly healthy on a lot of lithium setups. What battery chemistry are you running? If it's LiFePO4 that threshold is definitely off. Also make sure Remote Control is properly enabled in VictronConnect so the Cerbo is actually the one calling the shots. Took me an embarrassing amount of head-scratching to figure that one out on my own system!

MandyPalmer56 | Posts: 423

@RobRobinson78 Just to add to what @HamishTaylor87 is saying about VictronConnect - make sure you're also checking the battery voltage compensation settings on the MPPT itself, not just the main parameters. After my v3.30 update last year, my temperature compensation had silently reset to a different value which was causing all sorts of phantom warnings. Took me ages to track down!

Also worth logging into the VRM portal and pulling up the battery voltage graph for the past few days - if the warnings are genuinely false alarms you'll see the actual voltage is fine despite the alert triggering. Gives you something concrete to take to Victron support if needed. Their community forum is pretty active too if you want a second opinion from their engineers directly.

BoxerProject | Posts: 634

@RobRobinson78 12.6v is basically a full battery depending on which day of the week Victron's firmware thinks it is 😄

Jokes aside — check whether the update has reset your battery preset back to "Generic" rather than whatever you had configured. Caught me out on my garden office

PanelPaula | Posts: 187

@RobRobinson78 Had something similar after a firmware jump on my static caravan setup last summer — turned out the MPPT had somehow reverted to a default battery profile that didn't match my actual bank. Worth double-checking whether it's now treating your battery as a different chemistry. Mine had quietly switched from lithium to AGM settings and was basically recalculating everything from scratch.

Also — has anything changed with your Cerbo's role as the "hub" for battery voltage? I've seen people mention that after updates the MPPT can temporarily prioritise its own voltage sense over the shared network, which would explain odd threshold behaviour. Is your battery voltage sense cable properly seated on the MPPT itself?

IslandVanLifer | Posts: 1,247

@RobRobinson78 Worth checking whether the firmware update reset your battery preset back to a generic flooded profile — this catches people out constantly. In VRM, dig into the MPPT's stored settings and cross-reference the low battery voltage trigger against what you had before. I've got three Victron MPPTs across my setup (van, garden office, and cabin feed) and noticed after v3.20 that one reverted silently to defaults with zero notification. The Cerbo doesn't always flag this clearly. If you're running lithium, that 12.6v warning threshold makes even less sense and almost certainly points to a profile mismatch rather than anything genuinely wrong with the charger logic itself.

Nessa | Posts: 891

@RobRobinson78 Welcome to the forum — great first post, very clearly described issue.

One thing nobody's mentioned yet: after v3.40 the Cerbo GX can override MPPT low voltage thresholds if it's taken charge of system voltage detection. Check in Remote Console → DVCC settings — if DVCC is enabled, your Cerbo may now be dictating voltage references rather than the MPPT doing it independently. I hit something similar on my static caravan battery bank and disabling DVCC (temporarily, to diagnose) immediately resolved phantom warnings. Worth ruling out before diving deeper into individual device configs.

PeakCruiser | Posts: 891

@RobRobinson78 Worth checking whether the DVCC settings got nudged during the update — I've seen Cerbo firmware changes quietly reset the "Low battery voltage" threshold under Device Settings on the VRM portal, even when everything looks fine locally. Also double-check your battery type is still set correctly in the MPPT itself via VictronConnect, as v3.40 apparently tightened how it interprets those presets. @BoxerProject makes a fair point about 12.6v being perfectly healthy, so this sounds more like a threshold misconfiguration than anything to genuinely worry about.