Victron Orion 30A keeping cutting out on long drives — anyone else had this?

Mine did exactly the same until I realised the engine bay was basically a slow cooker — thermal shutdown was the culprit every time.

A few things worth checking:

• Mounting location — if it's bolted somewhere with zero airflow it'll throttle itself silly on the A12 before you hit Chelmsford
• Input voltage threshold — worth logging with a Victron dongle to see if alternator voltage is dipping under load (some euro 6 engines get stingy with charge when the ECU decides it's feeling precious)
• Firmware — had an early unit on a mate's van that behaved like a toddler until we flashed it, completely sorted

My setup charges into a Fogstar Drift 100Ah and the Orion's been rock solid since I relocated it away from the engine block and cable-tied a small 12v fan to blow across it — janky but effective, she's never cut out since.

Worth also checking your B2B sense wire if you're using the engine-detect function — mine was reading phantom voltages and causing all sorts of drama.

What vehicle are you running it in? Some alternators just don't play nicely with the Orion's default thresholds and you end up chasing ghosts for weeks.

Anyone else on here gone down the Renogy DCC50S route instead and found it runs cooler? Curious whether it's just Victron being thermally dramatic or if it's a universal DC-DC thing.

@EssexCruiser nailed the thermal side, so won't repeat that.

One thing I'd add — check your alternator sensing wire. The Orion-Tr Smart can be a bit precious about input voltage thresholds. If it's seeing marginal voltage during heavy electrical load (heated seats, headlights, blower fan all on) it'll drop out thinking the engine's off.

Also worth checking: are you running the Victron Connect app during a drive? The shutdown history log is actually pretty useful — it'll tell you why it cut out rather than guessing.

Had mine do something similar last winter. Turned out the sense wire had a dodgy crimp. Five minutes with a proper ferrule sorted it.

If it's genuinely thermal, Fogstar sell thermal pads that help if you're mounting to a bulkhead rather than open air.

Mine ran so hot I could've fried an egg on it 🍳 — turned out I'd mounted it directly above the exhaust tunnel like a prize idiot.

Moved it to the opposite side of the van, added a small 12v fan on a thermal switch, and it's been rock solid since. Sometimes the fix is embarrassingly obvious in hindsight

Good shout from @MarineGaz on the alternator sense wire — that's caught me out before on a narrowboat install where the alternator voltage looked fine at the battery but the Orion was seeing something different entirely.

One thing nobody's mentioned: check your cable lengths and cross-sectional area on both input and output sides. Voltage drop across undersized cable can push the Orion into a protection mode that looks identical to thermal shutdown. Victron's own wiring calculator is worth running through.

On my van build I'm running 35mm² throughout with crimped lugs rather than bootlace ferrules — made a noticeable difference to stability over long runs. Also worth verifying your fuse rating isn't marginal; a slow-blow fuse running near its limit will heat the circuit unnecessarily.

Good thread. One thing nobody's mentioned yet — check your cable sizing on the input side. Undersized wire creates resistance, which means voltage drop, which the Orion interprets as "alternator's off, better shut down." Had exactly this on my cabin van build; kept blaming the unit until I realised I'd run 6mm² cable about 2 metres too far. Swapped to 10mm² and it's been rock solid since.

Also worth checking your inline fuse rating — if it's marginal and the engine bay gets warm, you can get nuisance trips there too.

@RiverRunner narrowboat installs are a nightmare for this — routing decent cable on those things is half the battle. 🚢