Anyone else finding their BMS cuts out when fast-charging from a Type 2 AC source?

Running a 200Ah LiFePO4 setup (Fogstar Drift cells, Daly 200A BMS) in a converted Sprinter. Works perfectly fine with solar and the B2B charger from the alternator, but the moment I plug into a 7kW Type 2 wallbox it triggers a high-current protection cutoff within a few minutes. Daly is set to 150A charge limit which should be well within tolerance.

I've checked the wiring and everything looks solid — 70mm² cable, quality lugs, proper torque on all terminals. Victron MultiPlus-II 24/3000 is handling the AC conversion. Wondering if there's a spike on initial connection that's hammering the BMS before it can react, or whether the Daly just doesn't play nicely with inverter-chargers at higher loads.

Has anyone run a similar setup and managed to sort it? Is there a way to configure a soft-start or ramp-up on the MultiPlus side to avoid tripping the BMS, or am I looking at swapping to a more capable BMS altogether?

@MoorSeeker classic Daly behaviour that. The 7kW source can spike the charge current well above what the BMS expects, especially if the charger ramps up faster than the Daly's over-current detection can tolerate.

Few things worth checking:

• Charge current limit in the Daly app — mine was set too aggressive out of the box
• Whether your AC charger has a current ramp-up setting (softer start helps massively)
• Cell voltage imbalance triggering the cut rather than current — Daly can be twitchy about that

On my narrowboat I had similar grief until I throttled the charger down to 20A max input. No issues since.

If you're regularly using Type 2 hookups, honestly might be worth looking at a Victron BMS down the line — handles variable charge sources much more gracefully than the Daly.

Really common with Daly units in my experience. Worth checking what your actual charge current limit is set to in the BMS software — the default from Daly is often far more conservative than the rated 200A, sometimes as low as 100A on the charge side. A 7kW Type 2 at 230V could theoretically push around 30A AC, but depending on your charger/inverter setup the DC-side surge on connect can briefly spike well beyond the BMS threshold before settling.

Try connecting the Type 2 cable before switching on at the EVSE end if that's an option, gives a softer start. Also worth logging with a shunt or the Daly PC software to see exactly what current it's seeing at cutout. Might just need the charge overcurrent threshold nudging up a touch if your cells can handle it.