Victron Multiplus tripping out when the washing machine kicks into spin cycle

Been dealing with exactly this on my narrowboat — the Multiplus 2000VA would drop out every time the spin cycle hit full speed. Nightmare when you're moored up and mid-wash.

After a lot of head-scratching, I found a few things worth checking:

Transfer switch delay — if you're running on shore power some of the time, there can be a brief dropout during load spikes. Worth checking your AC input current limit settings in VictronConnect.

PowerAssist settings — this was my actual culprit. The washing machine motor draws a massive inrush current during spin. If PowerAssist isn't configured properly it can't supplement fast enough and the unit trips on overload.

Battery state — what's your bank like? If the cells are tired or your BMS is cutting out momentarily under load, the Multiplus takes the blame but the battery's the real problem. I'm running Fogstar Drift 200Ah cells now and it's night and day compared to my old AGMs.

Also worth checking whether you've got the overload trip delay set too aggressively in the ESS or standalone settings. Sometimes tightening that up causes nuisance tripping on legitimate but spiky loads.

What Multiplus model are you running — 12V or 24V system? And is it a standalone install or part of a wider Victron setup with a Cerbo? Makes a difference to where the fault might be hiding.

Has anyone else found specific washing machine brands worse than others for this? I've heard front-loaders with brushless motors are generally kinder on inverters but curious what others have experienced.

@VivaroProject had exactly this on my static caravan setup last summer. Worth checking your transfer switch settings in VEConfigure — specifically the PowerAssist boost factor. Mine was set too aggressively and couldn't handle the inrush current when the motor ramped up.

Also, what's your battery bank situation? I'm running Fogstar Drift LiFePO4 and initially had the BMS cutting out under the sudden load spike before the Multiplus could even react. The two were basically fighting each other.

A few questions that might help diagnose:

• What firmware version are you on?
• Is it tripping on overload or low battery fault?
• Single Multiplus or have you considered stacking?

The Multiplus 2000VA is right on the edge for washing machine spin cycles — some pull 1800W+ peak inrush. Have you looked at the 3000VA as an upgrade path?

@VivaroProject this is a story I know all too well from my motorhome days before I finally got the settings dialled in properly.

The spin cycle creates what's called an inrush current spike — washing machines can draw 3–6× their rated current in that moment. Your 2000VA Multiplus may simply be hitting its overcurrent protection threshold.

Two things worth investigating that nobody's mentioned:

1. Check your AC input current limiter in VictronConnect — if it's set too conservatively, the unit trips before it can even attempt to handle the surge
2. Look at your PowerAssist settings — this is specifically designed to supplement shore/generator power during those peaks

What's your battery bank situation? A weak or undersized bank (particularly if it's older AGM) will sag under load and the Multiplus interprets that voltage drop as a fault condition.

The spin cycle surge is basically your Multiplus having a little panic attack — bump up the PowerAssist level in VE.Configure and make sure your AC input current limit isn't throttling it before the battery can step in to cover the spike. On my narrowboat setup I also found that a slightly sluggish battery connection was the hidden villain; even a marginal voltage drop under load was enough to trigger the low voltage shutdown before PowerAssist could do its job. Worth throwing a Victron Battery Sense on there if you haven't already — it gives the system a much more accurate picture of what's actually happening at the battery terminals rather than guessing from the inverter end.

@VivaroProject been there, done that, got the soggy laundry to prove it — check your battery cable gauge first because half the time it's not the Multiplus being dramatic, it's voltage sag on undersized cables making the low voltage cutoff trigger before PowerAssist even gets a chance to breathe. My 48V narrowboat setup had the same nonsense until I swapped to proper 70mm² runs. Also worth logging it through VRM to see the actual voltage dip during spin — because "it trips" tells you nothing useful diagnostically.