VE Bus Error 10

Been getting a VE Bus Error 10 popping up on my Multiplus-II 3000 over the last week or so and it's doing my head in. From what I can gather it's related to the DC voltage being out of range, but I'm not convinced that's the whole story here.

My setup:

• Multiplus-II 3000/120-32
• JK-BMS (16s, ~280Ah EVE cells)
• Victron SmartSolar MPPT 100/30
• Everything talking over VE.Can/VE.Direct to a Cerbo GX

The error seems to trigger seemingly at random — sometimes under load, sometimes just sitting at float. BMS isn't throwing any alarms at the same time, which makes me think it's not a cell-level issue. Bus voltage looks stable on the Cerbo dashboard when it happens.

A few things I'm wondering:

1. Could this be a wiring issue — loose connection on the DC side causing a momentary voltage dip the BMS isn't catching fast enough?
2. Anyone had issues with the Multiplus firmware causing spurious Error 10s? I'm on v502 I think.
3. Could it be temperature related? The van gets proper cold overnight at the moment and the inverter is mounted in a rear compartment with not much ventilation.

It resets itself after a minute or two, so it's not bricking anything, but I don't want to ignore it either — especially if I'm relying on the system while travelling.

Has anyone dealt with this in a similar 12v van build? Curious whether it's more common with JK BMS units specifically or just a coincidence.

@VanLee Error 10 is your Multiplus screaming "oi, sort your DC voltage out" — classic symptom of a dodgy connection somewhere rather than the voltage itself actually being wrong, so before you go down the rabbit hole of battery settings, get your thermal camera or a decent multimeter on every busbar, terminal, and fuse holder in the system because a milliohm of extra resistance at 100A looks absolutely catastrophic to the BMS and Victron simultaneously.

@VanLee to add to what @48VQueen said — worth checking your battery temp compensation settings if you're running a lithium pack. Victron's default profiles are tuned for lead-acid, so if someone's shoehorned a Fogstar or similar LiFePO4 in without adjusting the charge voltage parameters in VEConfigure, the Multiplus can occasionally throw Error 10 when it thinks absorption voltage has gone out of bounds.

Also, what's your DC cable length and cross-section? Undersized cabling creates enough voltage drop under load that the inverter sees a reading outside its acceptable window — even if your battery is perfectly happy. I've seen this catch people out more than anything else.

Pull the VRM logs if you're connected; the DC voltage graph around the error timestamps will tell you immediately whether it's a real undervoltage or a phantom reading from a connection issue.

@VanLee had the exact same on my T5 build — turned out my Lynx Distributor busbar connections had worked themselves loose over a few hundred miles of B-road "quality control testing", causing just enough resistance to spike the voltage readings and throw Error 10.

Torque everything to spec with a proper calibrated wrench, don't just go "yeah that feels tight" like I did the first time. Victron's own documentation specifies torque values for each connection point — actually use them.

Also worth pulling the VE.Bus cable between your Multiplus and any other Victron kit and reseating it; a flaky data connection can confuse the error reporting and send you chasing the wrong ghost entirely.

@VanLee one thing nobody's mentioned yet — check your DC system voltage range settings in VEConfigure. I had this exact error on my static caravan setup last winter and it turned out I'd somehow got the low voltage disconnect threshold set far too conservatively, so the Multiplus was tripping on what was actually a perfectly healthy battery voltage during high load events (kettle, that sort of thing).

Also worth datalogging through VRM portal if you haven't already — the error events show timestamped DC voltage readings which helped me pinpoint mine was only happening during morning EV charging sessions when everything was pulling simultaneously.

What's your battery bank? If you're on Fogstar Drift cells they can sag more than expected under sudden load.