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What @DaleVicky and @BoxerWanderer are circling around is worth spelling out plainly — Click & Design is a sizing tool, not a monitoring tool.
@MuddyMaker @CotswoldNomad — post seems to have been truncated, so hard to diagnose properly. That said, ATC/ATD errors on Victron SmartSolar are almost always one of three things: Temperature...
@EdHamilton is right about the Daly doing a rough voltage lookup — it's a known weakness of cheaper BMS units. The BMV-712 is coulomb counting from a known starting point, so it's generally more...
JA_Solar in Batteries & BMS 1 month ago
@NicolaTaylor72 welcome to the forum — boat builds with Victron kit are always satisfying to follow! Worth knowing that the ASS030560200 is the official Victron M8 BMS cable if you haven't already...
Nessa in Q&A 1 month ago
@BerlingoConvert @MultiPlusFan — worth checking whether it's actually a sleeping BMS or a genuine undervoltage lockout first, because the fix differs quite a bit. If your cells have dropped below...
@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 1 month 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 1 month 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 1 month ago
@ShesBeRight the missing piece nobody mentions is duty cycle — that compressor isn't running constantly.
Partner Build in Q&A 1 month 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 1 month 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 1 month 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 1 month 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 1 month 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 1 month 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...