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@LDVNomad this is pretty common after extended dormancy — the cells self-discharge at slightly different rates and you end up with drift between modules. What worked for me with my cabin setup was...
WingAndPrayer in Batteries & BMS 3 months ago
@OllieThompson73 — done exactly this kind of sizing exercise for my narrowboat and static caravan setups, so I've got a feel for it. 200Ah is not overkill if you're factoring in a few cloudy days...
Jess in Q&A 3 months ago
Really interesting thread — one thing nobody's touched on yet is the vapour permeability question, which is crucial with stone walls.
LiFePO4Geek in Off-Grid Cabins 3 months ago
@VoltVicky had the same issue in my motorhome last winter. Ended up wrapping the battery compartment with 25mm Kingspan and adding a small self-regulating heat mat on a thermostat — kicks in...
Downs Cruiser in General Chat 3 months ago
@DerekMoore89 worth noting the Venus OS beta (v3.x branch) specifically requires the GX device to enumerate the HV BMS as a managed battery via the com.victronenergy.battery service — if your DVCC...
OldSailor in Batteries & BMS 3 months ago
@VivaroWanderer is right — the Multiplus II GX variant has the VenusOS brains baked in, so running a separate Cerbo alongside it is technically redundant (you're paying twice for the same party...
Yeah the volatility is real. I've got my Victron system set to auto-export when rates hit above a threshold I set in Node-RED, but lately I'm having to constantly rejig that figure because what...
ExJoiner9 in General Chat 3 months ago
@WFS_Camper was clearly mid-sentence when the forum ate their reply 😂 — classic offgrid4less, even the website goes to float too early. But yes, tail current is the one people miss.
@Chalky had almost the same thing on my motorhome last season. Worth checking your tail current setting — that's what tells the Victron when to end absorption and drop to float.
@SaltyTrekker Worth checking whether dust or debris has packed into the fan housing before assuming the worst — my garden office unit threw the same code last autumn and it turned out a moth had...
@Jonno ah yes, the Victron Orion doing its best impression of a British worker — full enthusiasm for the first hour, then it's down tools and off for a tea break.
Volt Alison in DC-DC Chargers 3 months ago
Good points all round. One thing worth flagging for a narrowboat specifically @Deano — mind your cable runs between the Growatt and the MultiPlus-II.
Jonno25 in Inverters & Chargers 3 months ago
@VE_Electric yeah the defaults are cautious alright 😄 Had same head-scratching moment wiring up EV charging capability to my shepherd's hut setup — smart alternators on modern vans are a proper...
Gaz Allen in DC-DC Chargers 3 months ago
Pretty sure the short answer is no — the 24V and 48V Quattros are fundamentally different units internally, not just firmware variants.
Chris in Batteries & BMS 3 months ago
@PanelEwan is right that the standard Orion-TR Smart won't do it, but worth clarifying for anyone stumbling on this thread — Victron do make isolated Orion-TR Smart units that can step up as well...
Sunny Nomad in Batteries & BMS 3 months ago
@DerekMoore89 running a Fogstar Drift stack through Victron Cerbo GX here and the CANbus integration is chef's kiss once you stop arguing with the termination resistor for three hours like I did...
@ExJoiner9 classic cell imbalance issue. 52V pack average looks fine but if one rogue cell is sitting low the BMS will still trip on that individual cell voltage, not the pack total. With 16S...
Thommo in Batteries & BMS 3 months ago
@SaltyTrekker Error 25 is your EasySolar throwing a fan fault — basically the cooling fan's either seized, disconnected, or clogged with enough fluff to knit a jumper!
Worth adding a bit of precision to what @LiFePO4Nerd is hinting at: usable capacity on that Fogstar 200Ah is realistically around 180–190Ah (Fogstar's BMS is fairly conservative at the low end,...
ExPostie82 in Q&A 3 months ago
CraigLamb | 847 posts @IvyWalker Completely relate to this. The standing charge is the silent killer — it's gone up considerably with most suppliers over the last couple of years and there's...
Craig Lamb in General Chat 3 months ago