Victron Tower 6x MP2 6k5

Been mulling over a similar space-constraint problem with my shepherd's hut install, and this got me thinking about going vertical rather than horizontal with multiple MP2s.

For anyone unfamiliar, the concept is essentially racking several Multiplus-II 6000s (the 6kVA/5kW units) in a freestanding tower arrangement rather than wall-mounting — useful when you've got no suitable masonry, or you're on a floating setup like a narrowboat where drilling into a bulkhead isn't always ideal.

A few questions I'd genuinely like input on:

Thermal management — stacking MP2s vertically in a tight enclosure concerns me. Victron's own guidance suggests leaving reasonable clearance above and below each unit. Has anyone here run three-phase parallel configs in a tower and found the upper units running notably hotter? I'd imagine convection becomes your enemy fairly quickly past unit three or four.

Three-phase vs single-phase parallel — for UK domestic/off-grid use, is anyone actually running three-phase setups, or is this mostly relevant to smallholdings with three-phase machinery? My shepherd's hut is obviously single-phase, but I'm curious whether the tower form factor makes more sense at scale with a proper 3P arrangement.

Battery integration — the original concept pairs this with substantial 48V packs on casters. Fogstar Drift or similar lithium setups would suit the mobile aspect nicely, though the cabling runs between a rolling battery stack and a freestanding inverter tower would need careful consideration for volt drop.

The elegance of a self-contained, moveable power system appeals enormously — especially for anyone doing seasonal or semi-permanent off-grid setups.

Anyone built something similar in the UK? Particularly keen to hear from

@LutonCamper — worth flagging that vertical mounting of MP2s isn't straightforward. Victron's own documentation specifies clearance requirements that become awkward when stacking, particularly around the cooling vents on the bottom and sides.

For my shepherd's hut install I went with a wall-mounted pair in a back-to-back configuration on a 150mm standoff frame, which kept airflow manageable. The critical thing people miss is that the MP2 6k5 runs hot under sustained load — I've seen mine hit thermal throttle at around 65°C ambient inside an enclosure without adequate spacing.

If you're genuinely space-constrained, have you considered whether you actually need multiple units vs a single larger unit? What's your peak load requirement? Sometimes the Quattro route makes more sense than paralleling MP2s, especially if you're also dealing with generator integration in a hut setting.

@PaulCross is right, but also — six of them stacked vertically is basically just a very expensive radiator at that point 🔥

@MultiPlusFan that's underselling it — at full load you're talking serious heat dissipation in a very confined column of air. Even with forced ventilation I'd be nervous about thermal throttling on the upper units.

For a shepherd's hut specifically, have you actually measured the wall space properly? I squeezed a single MP2 5000 into my garden office install with careful planning and it wasn't as tight as I'd feared. Sometimes the "no horizontal space" problem dissolves once you actually tape out the dimensions.

If stacking is genuinely the only option, I'd strongly suggest getting Victron's official installer guidance rather than improvising — the airflow requirements are well documented and ignoring them will cause grief down the line.

@AlexPalmer60 raises the point I was about to ask about — has anyone actually measured the thermal delta between inlet and outlet air on a stacked arrangement like this?

In my garden office setup with just two MP2s side by side, I'm already seeing the second unit running noticeably warmer than the first. Extrapolate that to six units in a vertical column and I'd want to see some real data before committing.

Is forced airflow between units the standard mitigation here, or are people relying purely on the MP2's internal fans? And what spacing between units are people actually achieving in practice versus what Victron specifies?