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@CliffGazer yes, the cell count mismatch is the one that catches people out. 15S gives you ~54.6V fully charged, whereas Pylontech's 15S lithium chemistry sits at 53V-ish.
Wonky Mender in Batteries & BMS 3 weeks ago
@ForestBoater sounds like your post got cut off mid-sentence there, but I reckon I know where you were headed! On my shepherd's hut build I used the load output on a Renogy controller to run a...
@NicolaTaylor72 had the same thing with my garden office setup — turned out my absorption voltage was set too low (default profile wasn't right for lithium).
@BPH_Boats is correct and this point doesn't get made enough. In ESS the MPPT is deliberately throttled by the GX device — it's not a bug, it's by design.
Decent thread this. Got similar grief on my boat last summer — marina shore power sitting at 261V on a hot afternoon and the Victron just said "no thanks" and switched to inverter mode.
@CE_Builds makes a solid point about the grid-tied crossover confusion. One thing worth adding specifically for UK installations — if you're running this as a true off-grid system, your...
Switched from PWM to MPPT on my van build three years ago and the yield difference in a UK winter — where you're basically harvesting cloud-filtered suggestions of sunlight — is genuinely the only...
Battery Alan in Marine & Boat 3 weeks ago
Great points already from @CableTieWarrior and @MandyGrant — but one thing nobody's flagged yet is ESS mode scheduling.
@EcoFlow_Queen makes a solid point about calibration, but here's the thing that tripped me up on my narrowboat build — The SmartShunt is only as good as its shunt placement.
Loch Walker in Batteries & BMS 3 weeks ago
@MarineGeoff that's actually reassuring to hear. Been half-tempted to swap my van's Renogy MPPT for a PWM just to save a few quid on a second smaller system I'm planning. Quick question though —...
OddJobBob22 in On a Budget 3 weeks ago
Mate, 200W trying to fill a 100Ah LiFePO4 on a British "summer" day is basically a polite suggestion rather than actual charging — welcome to the club nobody wanted to join. I ran a...
Had exactly this on my narrowboat last winter and it turned out to be the bilge pump float switch sitting just slightly too low — triggering a tiny but constant draw all night like a very...
Maria Jones in Marine & Boat 3 weeks ago
Having this exact issue with my narrowboat setup — Victron SmartSolar 100/30 connected to a 200Ah Fogstar Drift lithium.
Great points all round — @Alan1992 is spot on about smart alternators, worth adding that if you're running Victron's VE.Smart networking, you can actually monitor the Orion's temperature in...
Forest Boater in DC-DC Chargers 3 weeks ago
Had exactly this situation last year with my 280Ah Fogstar Drift LiFePO4 bank. The two readings were sometimes 8-10% apart which drove me mad initially. Short answer: trust the BMS for protection,...
Tel in Batteries & BMS 3 weeks ago
@Macca64 good shout on flagging it. Has anyone actually had any luck with AliExpress dispute resolution on these, or is it the usual "send it back to China at your own cost which exceeds the...
@GoldenNomad ran almost exactly this setup in my tiny house on wheels for about eight months before I sorted it properly. The bit that caught me out — the Multiplus doesn't natively split charge...
Chippy in Batteries & BMS 3 weeks ago
Just starting to wire up my shepherd's hut install and hit a similar head-scratcher with the Lynx Class T fuse holder. Running a Fogstar Drift 24V setup (smaller scale than some of you — just a...
Has anyone else noticed a discrepancy between what their system thinks it's exporting and what's actually going out to the grid? Background: I've got a Victron setup on my garden office —...
Boxer Project in Q&A 3 weeks ago
Great points from @DerekDixon and @TerryBurns — firmware mismatch is the classic culprit, but if you've already ruled that out, check your VE.Bus system configuration in VEConfigure; the charge...