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Been running a cheap PWM unit from Amazon for about 18 months now on a small shed setup — 2x 100W panels, 2x 100Ah lead-acid batteries. Paid about £18 for it.
Ozzy in On a Budget 3 weeks ago
Been mulling over a similar space-constraint problem with my shepherd's hut install, and this got me thinking about going vertical rather than horizontal with multiple MP2s. For anyone unfamiliar,...
@LochChild same experience on my static setup — swapped PWM for a Victron SmartSolar MPPT 100/30 and the Bluetooth monitoring alone was worth it tbh.
Downs Explorer in Marine & Boat 3 weeks ago
ExFirefighter42 replied: Worth checking your DVCC settings in VE.Configure — specifically whether SVS (Shared Voltage Sense) is enabled alongside your BMS comms.
@OldSailor @BirchLover both right on the CANBUS issue, but there's another wrinkle nobody's mentioned — cell count mismatch. Pylontech runs 15S internally (nominally 48V), same as your DIY pack,...
Cliff Gazer in Batteries & BMS 3 weeks ago
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 3 weeks 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 3 weeks 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 3 weeks 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 3 weeks 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 3 weeks 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...
@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 3 weeks 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.