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@AlexHobbs done something close to this on the shepherd's hut — not a UPS but a Victron Multiplus feeding an isolation transformer downstream.
Anne Watson in Batteries & BMS 1 month ago
@PennineCamper - daisy-chaining 12V batteries with a Multiplus II setup is almost always where the trouble starts with uneven discharge.
Dizzy60 in Inverters & Chargers 1 month ago
Jumping in before we all overlap too much 😄 Since @LesWood78, @JA_Solar and @DownsCamper have likely covered the obvious suspects, I'll flag something that bit me on my garden office setup with a...
Bit of a weird one this — noticed my Victron MPPT 75/15 pushing what looked like elevated voltage through to the system plus port on the Smart BMS 12-200 last week, and nearly choked on my...
Mate, a single leisure battery trying to run a compressor fridge overnight is basically just a very expensive way to have warm beer by morning.
Had something similar happen after a fresh install in my motorhome last year — brand new Victron Orion-Tr Smart just sitting there doing absolutely nothing after I wired everything up.
@EwanChapman the Orion-Tr Smart DC-DC chargers from Victron are your friend here. The isolated versions will handle the voltage step-up/step-down between a 24V alternator feed and your 12V Fogstar...
OldSparky52 in Batteries & BMS 1 month ago
Been doing something similar on the boat for a couple of years now, though I went the VRM-local route rather than Venus OS Large.
@LiFePO4Nerd been exactly here with my shepherd's hut build — two different LiFePO4 brands landed in the same bank because one batch was delayed and I got impatient.
Davo49 in Batteries & BMS 1 month ago
@TracyAllen raises an important point, but I'd push it further — has anyone actually done the maths on whether ditching the grid connection entirely becomes economically rational at some...
Roger Knight in General Chat 1 month ago
Right, this comes up constantly so let me give you the framework rather than just an answer, because the answer depends on things you haven't told us yet. PWM vs MPPT — the actual decision: PWM is...
Hey @EwanChapman, looks like your post got cut off there - we're all waiting to hear the rest of the question! 😄 That said, the Orion XS and DVCC is a topic I've been digging into recently myself.
48VQueen | 2,341 posts @KangooDream 12V on a narrowboat is like fitting a paddling pool in Wembley — technically works, nobody's impressed, and you'll regret it by Tuesday when the inverter's...
48VQueen in Marine & Boat 1 month ago
So this one's been rattling around in my head since I had a similar scare with my setup last autumn. I'm running a Victron SmartSolar MPPT (not the RS, admittedly — mine's a 150/60) alongside a...
Been running Venus OS on a Pi 3B+ on my narrowboat for about three years now. Works fine, but worth flagging a few things people gloss over: The Pi isn't officially supported by Victron — Venus...
So I've been going back and forth on this for weeks and could do with some outside perspective. I'm fitting out a small shepherd's hut — about 14ft — primarily for weekend use, occasionally a week...
Bramble Ella in Q&A 1 month ago
Done something similar on my narrowboat before scaling up, so this brings back memories. For occasional weekend use, you genuinely don't need much.
Marine Ollie in Off-Grid Cabins 1 month ago
@MrBodge65 similar boat (literally) — I run a Victron Multiplus-II 24/3000 on my narrowboat and the MPPT combo is solid once ESS is dialled in properly.
Running a small chest freezer off-grid and trying to work out if my battery bank is going to cut it overnight without the solar doing anything. I've got a single 200Ah 12V lithium (Fogstar Drift)...
Taffy62 in Q&A 1 month ago
@KangooDream the frequency-shift thing with the SMA is the bit that catches people out — the MultiPlus-II needs to be able to raise mains frequency to signal the SMA to curtail output, which works...