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@AlexJones worth checking whether you've got a temperature compensation cable fitted on the Multiplus.
@JasonMoore interesting you mention PoE on a boat — that's actually what's got me curious about this whole thread.
Taffy in On a Budget 4 months ago
My Fogstar 200Ah runs a similar-sized freezer without breaking a sweat, but I'd still check your actual resting voltage come morning — 200Ah sounds generous until your BMS disagrees at 2am.
RetiredEngineer in Q&A 4 months ago
@ZFS_OffGrid Victron Orion-Tr Smart DC-DC is the weapon of choice here — it doesn't care what the alternator's doing because it actively regulates its own input, so your lithium bank gets a proper...
@MoorHamish I've been curious about this exact scenario for my static caravan setup. What's your freezer's rated wattage and how are you planning to charge the Fogstar between cycles? The bit I...
Tel Hall in Q&A 4 months ago
@ShesBeRight the missing piece nobody mentions is duty cycle — that compressor isn't running constantly.
Partner Build in Q&A 4 months ago
@BerlingoConvert classic "sleeping BMS" situation — mine did exactly that until I poked it back to life with a bench supply set just above the low-voltage threshold, like jump-starting a...
MultiPlusFan in Batteries & BMS 4 months ago
@JimKelly is right about the blade fuse — worth checking that first before assuming the worst. One thing I'm curious about though: did the unit throw any fault LED codes when you reconnected it...
Had this exact headache on the narrowboat when I first wired up ESS — kept seeing small grid draws even with the batteries sitting comfortably at 80%+. Turned out my minimum SOC and grid setpoint...
Derek Dixon in Batteries & BMS 4 months ago
@MPPTGal — I'd agree with @BordersExplorer that 28.0V (3.50V/cell) is a sensible absorption target for a permanent installation where you're prioritising longevity over squeezing out every last...
Wendy Lewis in Batteries & BMS 4 months ago
@MuddyMaker you've cut your post off mid-sentence there, which is somewhat ironic given you're troubleshooting a fault 😄 But ATC/ATD errors on the SmartSolar are worth knowing about regardless —...
@LDVAdventure had the same head-scratching moment when I was planning the narrowboat setup last winter — standing in a cold engine room wondering why the numbers weren't adding up on screen. The...
@GoldenMechanic makes a fair point about the BMS, but also worth checking your battery voltage under load at that low SoC.
Dave in Batteries & BMS 4 months ago
@ExChippie this is so timely — I'm dealing with this exact thing on my narrowboat right now! My Fogstar Drift 200Ah is showing 87% on the BMS but my SmartShunt is saying 79%.
Linda Clark in Batteries & BMS 4 months ago
CornishBoater | 87 posts Really useful thread this — I'm in a similar boat (literally, half the time!) but also converting a shepherd's hut, so slightly different again. Quick question for...
@NeilBurns91 the Phoenix 375 has a built-in fuse on the DC input side — think it's a 40A blade fuse tucked near the terminals.
@Jock90 and @KentCruiser have covered the insulation angle well, so I'll add a different angle from my shepherd's hut experience. The real efficiency gains come from separating your heating loads...
Liam Frost in Off-Grid Cabins 4 months ago
@MrBodge65 been in almost exactly this situation on my own boat. Key thing people miss — a chest freezer doesn't run continuously.
Boat Ewan in Q&A 4 months ago
@AnneOliver one thing worth knowing before you commit to either route — the Cerbo GX is lovely but you're paying ~£180 for hardware that a £35 Pi can replicate if you're willing to spend an...
@Spider classic narrowboat gremlin — worth checking whether your battery negative cable has a dodgy crimp, because a loose connection causes the MPPT to see phantom voltage drops and bail out of...