Anyone else had grief with inverter idle draw on a static setup?

Been running a Victron Multiplus 24/2000 for about three years now on my static caravan and cabin setup, and I've just started obsessing over the idle draw since I actually sat down and did the maths properly. The unit pulls somewhere around 25-30W just ticking over doing nothing — which sounds trivial until you realise that's 600-720Wh per day, or roughly 15-18Ah at 24V, before you've switched a single light on. Over a cloudy week in January when my four 200W panels are producing next to nothing, that's genuinely painful.

I've been experimenting with the "Search Mode" / AES function in VictronConnect to let it drop into a low-power hunting mode, but honestly I'm not convinced it's doing what it should. The Multiplus wakes and sleeps fine on loads above about 50W, but I've had issues with it not detecting smaller loads properly — LED lighting, a small pump, that sort of thing. There's also the well-documented concern about AES causing issues with certain electronics due to the voltage pulsing when it's "searching."

Has anyone found a sensible threshold setting that actually works in practice without causing flickering or false trips? And is there a meaningful argument for just putting the inverter on a physical timer or a Victron BatteryProtect circuit instead, so it's only live when you actually need AC? Feels like there should be a cleaner solution than faffing with AES thresholds at 11pm when the battery's draining faster than I'd like.

LizWalker | Member since 2019 | Posts: 847

@FormerTeacher oh, this rabbit hole! I went down it last winter and came out the other side slightly unhinged 😄

The Multiplus idle draw genuinely adds up over a year - I calculated mine was costing around 150-180Ah per day just ticking over doing nothing useful. On a static setup where you're not generating overnight, that's painful.

What helped me massively was setting up the "search mode" function in VictronConnect - it pulses rather than continuously monitors for load. Cuts idle draw significantly. Only caveat is it can cause a slight flicker on some sensitive electronics when it "wakes up," but I've never had an issue personally.

Worth checking your assistants configuration too - sometimes the default settings are far from optimal for a static caravan scenario versus a boat or vehicle install.

ColPalmer | Member since 2021 | Posts: 312

@FormerTeacher the maths really does sting when you see it written down, doesn't it! On a 24V system the Multiplus 2000 is pulling somewhere around 11W idle if I recall correctly - that's roughly 264Wh just sitting there doing nothing over 24 hours. Across a year you're looking at nearly 100kWh vanishing into thin air.

One thing worth considering if you haven't already - the search/eco mode function on the Victron. It's not perfect for every setup, particularly if you've got sensitive electronics, but for a static cabin where you can predict your loads it can make a noticeable dent. You configure the sensitivity threshold through VE.Configure and it essentially puts the inverter into a low-power listening state.

What does your typical overnight load look like? That'd help figure out whether eco mode's actually practical for your situation.

RobJones85 | Member since 2022 | Posts: 156

Same deal on my motorhome — Victron Multiplus 12/1200 sitting at around 18-20W idle. Doesn't sound much but that's ~440Wh a day doing absolutely nothing.

Switched over to using the search mode and it made a noticeable difference, though I know some people have issues with it not picking up certain loads fast enough.

What I actually ended up doing was putting a simple timer on it — cuts the inverter overnight when I'm only running 12V stuff anyway. Saved me a fair chunk of battery capacity on my Fogstar Drift cells.

Worth checking your actual idle draw with a meter rather than trusting the spec sheet too — mine was slightly higher than Victron quoted.

Midge55 | Member since 2020 | Posts: 423

@FormerTeacher worth looking into the Victron ESS assistant if you haven't already — you can set up a minimum SOC threshold and have the inverter drop into a low-power mode during overnight hours when you're not drawing much. Made a noticeable difference on my setup.

Also, have you checked whether search mode is enabled? On the Multiplus it pulses output rather than running continuously when loads are very low. Some sensitive electronics don't play nicely with it, but for static setups with predictable loads it can claw back a fair bit over 24 hours.

The idle draw is genuinely the thing nobody talks about enough when speccing a system. Everyone fixates on peak loads and panel output but that background vampire drain adds up brutally across a whole year.

GemmaCooper86 | Member since 2023 | Posts: 89

@FormerTeacher completely relate to this — I've got a Multiplus-II 24/3000 split across a static and a garden office and the idle draw was genuinely eye-opening once I started logging it properly with a Cerbo GX.

One thing nobody's mentioned yet: dynamic cutoff settings are worth revisiting alongside the idle draw issue. I had mine set too conservatively which meant the inverter was cycling oddly and drawing more than it should at low loads.

Also switched to using the scheduled charging feature to keep the Multiplus in passthrough mode overnight rather than sitting in inverter mode when nothing's really running. Made a noticeable difference on my Fogstar 24V battery bank's daily consumption figures.

The power assist feature is your friend if you're occasionally on hook-up too.

SolarMike | Member since 2019 | Posts: 1,247

@FormerTeacher the idle draw rabbit hole is a real one! One thing nobody's mentioned yet — have you tried enabling the dynamic cutoff settings in VictronConnect? On a static setup where you know your load patterns, you can get quite aggressive with the search mode sensitivity so it wakes quickly but spends more time in low-power state.

Also worth checking your actual measured idle draw against Victron's spec sheet figures — I found mine was drawing noticeably more than quoted until I updated the firmware. Made a genuine difference.

@Midge55 makes a fair point about ESS, though on a purely off-grid static setup without grid connection it's not always applicable.

What's your typical overnight baseline load looking like @FormerTeacher? That'll determine whether the idle draw is actually significant relative to your overall consumption.