Anyone else had grief with a Victron Multiplus 2 tripping on high loads? Need some advice

I've been running a Victron Multiplus 2 48/3000/35 in my off-grid setup for about eight months now and it's been mostly brilliant, but I keep getting nuisance trips when I fire up my kettle and the air fryer at the same time. We're talking roughly 2,800W combined, which should theoretically be within the 3,000W continuous rating, but the unit cuts out within about 30 seconds every single time.

The battery bank is 280Ah of CALB LiFePO4 cells wired in series for 48V, so roughly 13.4kWh usable. I've checked the cabling and it's all 70mm² from the batteries to the inverter with proper lugs, so I don't think voltage drop is the culprit. Ambient temp in the cabinet is around 18°C, so overheating seems unlikely too.

I had a dig around in VictronConnect and noticed the low battery voltage alarm was flickering briefly during the trip — it showed something like 47.1V momentarily. I'm wondering if the BMS is throttling the discharge current and the inverter is seeing that as a low voltage condition rather than an actual battery problem. My BMS is a JK 200A unit and I haven't touched the default settings since I built the pack.

Has anyone seen similar behaviour, or does anyone know whether tweaking the "DC input low shut-down" threshold in VE.Configure would help here? I'm also curious whether setting up proper DVCC between the BMS and the Multiplus might smooth things out.

@RobRobinson78 the 3000VA unit is right on the edge with a kettle — most draw 2800-3000W alone. A few things worth checking:

1. PowerAssist threshold — in VE.Configure, look at your AC input current limit. If it's set conservatively, the Multiplus will try to supplement from battery but may still trip on the inrush spike.

2. Dynamic Current Limiter — enable this under the assistants tab. It specifically handles appliances with aggressive startup currents.

3. Battery internal resistance — if your cells are ageing or your BMS is throttling discharge current, the DC bus sags under load and triggers low-voltage protection. What battery are you running?

Running a 48/5000 myself in the garden office and had identical issues before I sorted the DC cable sizing — 35mm² minimum from battery to inverter is non-negotiable at those currents.

PanelChris | 847 posts | Solar Evangelist ☀️

@RobRobinson78 Classic issue this one! The 3000VA unit can struggle with kettle inrush if your battery cables aren't up to scratch. A few things worth checking:

• What's your battery bank size and cable gauge? Undersized cables cause voltage sag which the Multiplus interprets as an overload
• Check your DC fuse/breaker rating - sometimes these are the weak link
• In VictronConnect, have a look at your "Overload" vs "Low battery" shutdown codes - they'll tell you exactly what's triggering it

The 48V version should handle a standard 2kW kettle no problem in theory, but poor connections anywhere in the DC circuit will cause grief. What's your battery chemistry - lithium or lead acid? Lead acid sags much harder under sudden loads.

Worth posting your VRM data if you've got remote monitoring set up 👍