Anyone else had grief with a Victron MultiPlus 2 tripping on shore power at a campsite?

Been running a MultiPlus 2 48/3000 in my converted Sprinter for about eight months now and it's been brilliant on solar and battery, no complaints. The problem comes whenever I plug into a campsite hook-up — getting nuisance trips on the input, usually within a few minutes of connecting. The site supply is typically 10A or 16A (varies), and I'm not drawing anywhere near the limit when it happens.

I've had a poke through VictronConnect and I noticed the AC input voltage was sitting at 207V on one site and dipping as low as 198V on another. My suspicion is the MultiPlus is being fussy about the incoming supply quality, but the default input voltage range should handle that, shouldn't it? I've not touched the shore power settings beyond the basic setup — input current limit is set to 10A and I've left the weak AC stuff alone because I wasn't sure what it does.

Has anyone dealt with this? I've got a Cerbo GX on board so I can pull logs if that helps diagnose it. Wondering whether it's worth tweaking the lower AC voltage threshold in VEConfigure or whether I'm barking up the wrong tree entirely.

Had this exact issue in my shepherd's hut setup before I sorted it. Nine times out of ten it's the input current limit set too high for what the campsite hook-up can actually deliver — most UK sites are 10A or 16A max, but some older ones are genuinely sketchy 6A supplies.

In VictronConnect, check your AC input current limit under the MultiPlus settings. Drop it to 6A and see if it stabilises. The MultiPlus 2 will then blend shore power with battery rather than demanding full tilt from a weak supply.

Also worth enabling PowerAssist if you haven't — it's a game changer for marginal hook-ups.

@Rodney47 what's the site's stated amperage? Some campsites advertise EHU but the actual supply is woeful.

Worth checking if the campsite supply is genuinely as dodgy as it smells — I've had my MultiPlus 2 on the boat trip out because the "16A hookup" was actually delivering a wobbly 195V with more harmonics than a church choir.

Stick a plug-in energy monitor on it before you even connect the MultiPlus and see what you're actually working with. Also, in VictronConnect check your AC input voltage range — mine was set too tight from factory and anything below 207V sent it sulking. Widening the lower threshold to around 185V sorted it overnight at some truly grim campsites along the South Coast. 🚐

Been there with mine on a narrowboat — one thing nobody's mentioned yet is the UPS function setting. If it's enabled, the MultiPlus switches between shore and inverter extremely fast and some campsites with wobbly frequency (not just voltage) will confuse it into a loop of trips. Try disabling it in VE.Configure if you haven't already.

Also worth enabling the weak AC input option — it's buried in the charger settings but it genuinely helps when the site's generator is struggling under load from other pitches. Made a noticeable difference for me at busier sites over summer.

@TinaHenderson is right about the input current limit being a likely culprit too, but I'd check those two things first as they're quick wins before you start throttling the charge current right down.