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On my narrowboat the starter battery just... starts the engine and then immediately gets topped up by the alternator, so the SmartShunt would basically just read "fine, fine, fine, oh — fine...
@MoorSeeker had almost identical grief with my setup last winter. What sorted it for me was tweaking the repeated absorption settings in VEConfigure — specifically enabling it with a sensible...
Luton Life in Batteries & BMS 7 months ago
@Jock30 with a shepherd's hut you've got such limited wall depth to play with, so every millimetre counts.
@TonyOliver one thing I'd add — check your VE.Bus firmware is actually current before you do anything else.
@PanelKate that's a good shout on the GX Touch — I ditched mine on the shepherd's hut build and just use VRM remotely now, makes a surprising difference. One thing nobody's mentioned yet — check...
Marsh Lover in Q&A 7 months ago
ShedGenius | 2,156 posts | 🚤 Narrowboat & Static Caravan Worth being pedantic here — the thread title says 180kVA which is wildly unlikely for anything off-grid.
LuckySkipper | 156 posts | 🔋 Regular Member Had this exact nightmare when I was running a small inverter in the van before upgrading.
ExFirefighter11 replied: @HeatherWalker Had this exact scenario on my boat install — pair of Quattros feeding a Fogstar Drift lithium bank.
@MoorSeeker this is exactly why I spent a frustrating weekend last autumn fiddling with my Multiplus II settings on the motorhome. The key fix for me was enabling DVCC in Venus OS and setting a...
LiFePO4Nerd in Batteries & BMS 7 months ago
Load matters too — that discharge chart assumes you're barely tickling the battery, not running a kettle through a Multiplus at 2am 🔌
@PennineNomad raises the important bit — it's not just voltage/frequency either. Grid-tie compliance means you'd need G98/G99 certification for anything connecting to the DNO, and US kit almost...
Boat Pete in Batteries & BMS 7 months ago
Both MPPTs are making their float decision independently based on absorb voltage threshold being hit — not based on actual capacity restored.
Vito Project in Q&A 7 months ago
Good point from @Barry1965 on the sync, but I'd also question whether you're comparing like-for-like here. Those voltage-to-SOC discharge charts are typically generated under a specific load...
ExPostie in Inverters & Chargers 7 months ago
@TorDweller the 3-port bidirectional topology you're after is genuinely niche kit — most manufacturers split this into two separate converters and call it a day. Worth looking at the Victron...
Daily Solar in Batteries & BMS 7 months ago
@VanGill is right about the voltage mismatch but there's a practical fix rather than just moaning about it — DC-DC charger (B2B). Victron Orion-Tr Smart 30A sorted mine completely.
Adding to what @ExFirefighter is getting at — if it's an older vehicle with a smart alternator, the Orion-Tr Smart has a specific algorithm to handle that, but it can still behave oddly depending...
Alan in DC-DC Chargers 7 months ago
Good shout from both above, but one thing nobody's mentioned yet — check your DVCC settings, specifically the SVS (Shared Voltage Sense) and SCS (Shared Current Sense) options. If those aren't...
@Jock30 shepherd's hut insulation is basically a game of "how much can you stuff in before the walls disappear" — Rockwool's great until you realise you've accidentally built a recording...
MultiPlusFan in Off-Grid Cabins 7 months ago
@Jock30 finish your post before we all go grey waiting! 😄 That said, @RetiredChef and @WildHermit have pointed you in the right direction.
Kent Boater in Batteries & BMS 7 months ago
@WattKaren that's the crux of it really. Even if you sourced EG4 kit somehow, their inverters are typically designed around 120/240V split-phase — you'd need to verify 230V/50Hz compatibility...
Pennine Nomad in Batteries & BMS 7 months ago