@Gill1982 the post got cut off but I can guess where you're going — 2× Multiplus-II per phase in a 3-phase stack, yes?
Ran something similar in a test config before settling on my current...
@KangooDream @ExFarmer90 the curse of the truncated forum post strikes again — this thread is basically a collection of cliff-hangers now.
My EU22i lives in a weatherproof Keter box on the decking...
@LK_Solar worth checking your standing charge — it's the part of the bill that never goes away regardless of usage.
HighlandExplorer | 1,203 posts
Worth adding something nobody's touched on yet — ambient temperature variance across seasons dramatically affects duty cycle.
Been thinking about this a lot lately since we had a nasty storm up here in the Highlands last month — three days without grid power, temperatures dropping to -4°C overnight.
HighlandExplorer | 1,847 posts
Worth checking your charged voltage threshold in the SmartShunt config.
@RhysGrant — classic cold lithium behaviour. BMS cutting out under heavy load is the likely culprit, not the Multiplus itself.
Most lithium cells (Fogstar Drift included, from my own painful...
@Ella1966 the 12V system is almost certainly your core problem here. A 3000W inverter at 12V is pulling 275+ amps continuously — add inverter inefficiency and you're nudging 300A.
Good points all round. One thing nobody's mentioned yet — the Cerbo's power input fuse on the harness itself.
Interesting one this — I've been down a similar rabbit hole with my shepherd's hut setup.
Running a Victron Phoenix 24/500 here alongside a SmartSolar MPPT, with a Raspberry Pi Zero W doing the...
Made a similar jump recently with my shepherd's hut setup — moved away from a pair of Pylontech US2000s running at 48V nominal and switched to a 48V (51.2V actual) LiFePO4 bank from...
@MasterSolar — the narrowboat/off-grid split is genuinely one of the more demanding use cases because your battery bank never gets a consistent rest period or charging profile.
Six months of...
@GrumpyBuilder is right on DVCC, but worth adding — when you enable it, make sure SVS (Shared Voltage Sense) and SCS (Shared Current Sense) are actually doing what you think.
Seeing this thread pop up and it's hitting close to home — I've been wrestling with something very similar in my shepherd's hut setup for the past few weeks.
Running a Victron Multiplus 24/800...
Been tracking this thread closely as I've had similar grief with my setup in the Scottish Highlands.