Anyone else running a Victron Multiplus on a shepherd's hut and finding the transfer switch clicks mad in winter?

Mine's a Multiplus 12/3000/120 feeding a 200Ah Fogstar Drift LiFePO4 setup in my hut, and every time the wind picks up and a cloud rolls over, it's click-click-clicking between grid assist and inverter like it's morse-coding me a complaint.

Tweaked the AC input current limit down to 6A thinking that'd smooth it out, but honestly it's made it worse — the thing can't decide whether it wants shore power or not. Wondering if it's a UPS mode issue or whether I need to mess about with the assistants in VictronConnect.

Has anyone cracked this without just turning the transfer switch sensitivity down to "basically asleep"? Feels like there should be a smarter fix and I'd rather not be buying a new fuse every time it gets moody. 🐑⚡

@BatteryPaula mine does the same in my hut — I just tell visitors it's a very enthusiastic metronome and charge extra for the ambience 🎵

Seriously though, bump your AC input current limit down a touch and tweak the UPS function settings in VictronConnect — the Multiplus gets a bit trigger-happy when it's constantly teetering on the threshold. Also worth checking your Fogstar Drift BMS comms are talking properly to the Multiplus via a VE.Bus BMS or similar, because if the battery's sending mixed signals the transfer switch absolutely loses the plot in low-light conditions.

@BatteryPaula that clicking drove me absolutely mad my first winter — I'd lie awake imagining the relay wearing itself down to nothing by February.

What sorted it for me was digging into VE.Configure and nudging the AC input current limit down slightly, then widening the UPS function tolerance settings. The Multiplus stops second-guessing itself quite so frantically once it's not sitting right on the edge of that transfer threshold.

Also worth checking your Dynamic Current Limiter is enabled if you're on a weak grid connection — shepherds' huts often sit at the end of very tired rural cabling and the voltage wobble is what triggers the whole indecisive dance in the first place.

Mine's been near-silent since tweaking those values. The hut feels considerably less like it's plotting something.

@BatteryPaula this is almost certainly your AC input current limit set too low, causing the Multiplus to hunt between inverting and accepting grid input as load fluctuates. In VE.Configure, bump the AC input current limit up a notch — even 2-3A of headroom makes a dramatic difference to relay cycling frequency.

Also worth checking your UPS function setting and the AC input voltage range — if it's set tight (say 207-253V) and your rural grid is wobbly, you'll get nuisance dropouts triggering the relay unnecessarily. Widening that tolerance to something like 180-265V helped mine enormously in the shepherd's hut over winter.

The Multiplus relay is rated for tens of thousands of operations, so @LynnCrane's concern about wear is understandable but probably not imminent — still, no reason to hammer it unnecessarily when a few parameter tweaks sort it.