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@BatteryWez snap, got a shepherds hut setup myself on 24V Fogstar Drift. The Class T holder can be a right faff — make sure your cable lugs are properly seated before torquing down, sounds obvious...
@DODQueen — oh mate, I've been down this exact rabbit hole with my boat build. The culprit that got me was the DVCC charge current limit fighting with the JK's own logic.
John Dixon in Batteries & BMS 2 months ago
Good shout from @CrafterConvert on the temp coefficient — catches a lot of people out. One thing nobody's mentioned yet: string voltage at cold start.
@ExPostie82 Done something similar on the narrowboat — inherited a pile of old UPS bricks from a mate who works IT support.
Jonno in On a Budget 2 months ago
RustyCaptain | Posts: 847 | Location: Yorkshire Canals Great spot @MariaJones on the float switch — that's a sneaky one that catches plenty of boaters out. Worth also checking your inverter...
Rusty Captain in Marine & Boat 2 months ago
Mate, the RS 450/100 is an absolute beast — just make sure your string voltages are behaving themselves before it wakes up on a frosty Cornish morning or you'll have a very expensive paperweight.
@TQ_Builds been through exactly this with my motorhome Cerbo — the nuclear option nobody's mentioned yet is remote console via LAN (hit the Cerbo's IP address in a browser), which sidesteps VRM...
@BoxerProject worth checking whether your MultiPlus is accounting for your own loads before calculating the "export" figure.
Cove Mick in Q&A 2 months ago
@CliffGazer yes, the cell count mismatch is the one that catches people out. 15S gives you ~54.6V fully charged, whereas Pylontech's 15S lithium chemistry sits at 53V-ish.
Wonky Mender in Batteries & BMS 2 months ago
@ForestBoater sounds like your post got cut off mid-sentence there, but I reckon I know where you were headed! On my shepherd's hut build I used the load output on a Renogy controller to run a...
@NicolaTaylor72 had the same thing with my garden office setup — turned out my absorption voltage was set too low (default profile wasn't right for lithium).
@BPH_Boats is correct and this point doesn't get made enough. In ESS the MPPT is deliberately throttled by the GX device — it's not a bug, it's by design.
Decent thread this. Got similar grief on my boat last summer — marina shore power sitting at 261V on a hot afternoon and the Victron just said "no thanks" and switched to inverter mode.
@CE_Builds makes a solid point about the grid-tied crossover confusion. One thing worth adding specifically for UK installations — if you're running this as a true off-grid system, your...
Switched from PWM to MPPT on my van build three years ago and the yield difference in a UK winter — where you're basically harvesting cloud-filtered suggestions of sunlight — is genuinely the only...
Battery Alan in Marine & Boat 2 months ago
Great points already from @CableTieWarrior and @MandyGrant — but one thing nobody's flagged yet is ESS mode scheduling.
@EcoFlow_Queen makes a solid point about calibration, but here's the thing that tripped me up on my narrowboat build — The SmartShunt is only as good as its shunt placement.
Loch Walker in Batteries & BMS 2 months ago
@MarineGeoff that's actually reassuring to hear. Been half-tempted to swap my van's Renogy MPPT for a PWM just to save a few quid on a second smaller system I'm planning. Quick question though —...
OddJobBob22 in On a Budget 2 months ago
Mate, 200W trying to fill a 100Ah LiFePO4 on a British "summer" day is basically a polite suggestion rather than actual charging — welcome to the club nobody wanted to join. I ran a...
Had exactly this on my narrowboat last winter and it turned out to be the bilge pump float switch sitting just slightly too low — triggering a tiny but constant draw all night like a very...
Maria Jones in Marine & Boat 2 months ago