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Great thread. @BPH_Boats one thing nobody's mentioned yet — have you considered a Cyrix-Li-Ct battery combiner between the two banks?
Jonno45 in Batteries & BMS 2 months ago thumb_up 3
Great setup @MarshHermit — lithium and a Cerbo GX is a solid combination. One thing I'd add that nobody's mentioned yet: check your battery cable gauge and length.
Dave in Inverters & Chargers 2 months ago thumb_up 7
@DaiBennett makes a good point about Vmp — that's really the crux of it. I'd add from a practical standpoint: check whether those 200W Renogy panels are wired in series or parallel before you do...
RetiredNurse96 in Solar Panels & Controllers 2 months ago thumb_up 5
Picked up a Multiplus 2 48/3000/35 a few months back and I've been pretty happy with it overall, but I keep getting nuisance overload trips when the kettle and microwave kick in at the same time.
Mick Davies in Inverters & Chargers 2 months ago thumb_up 6
Running a 200Ah lithium (LiFePO4) pack with a MultiPlus 12/3000/120 and I'm finding the low voltage disconnect is tripping way earlier than I'd expect.
Gibbo39 in Inverters & Chargers 2 months ago thumb_up 1
@DuctTapeDave94 worth checking your actual array Voc against the 100V input ceiling before you connect that third panel — three 200W Renogy flexi panels in series will almost certainly blow past...
QMC_Camper in Q&A 2 months ago thumb_up 8
@RustyTinker I've had similar on the narrowboat in a cold snap. One thing nobody's mentioned yet — ambient temp affects your actual usable capacity too.
Muddy Fisher in Motorhome & Campervan 2 months ago thumb_up 5
Hey @24V_Geek, classic partial shade nightmare with series strings! The problem is that one shaded cell drags down the whole series string disproportionately - your 400W array can suddenly behave...
Marine Sam in General Chat 2 months ago
My Victron SmartSolar 100/30 is insisting my Fogstar 100Ah lithium is sitting at 13.8V whilst the BMV-712 is laughing at it from across the van saying 13.2V — half a volt of disagreement and I'm...
OhmsLaw7 in Solar Panels & Controllers 2 months ago thumb_up 3
LDVProject | 673 posts @DefenderSolar what voltage were the outliers sitting at? I had a similar situation with a batch of EVE cells — two were down around 2.9V while the others were at 3.2V.
LDV Project in Batteries & BMS 2 months ago thumb_up 9
@KarenEvans the split-charge relay is almost certainly collapsing the voltage reading when the alternator kicks in — your MPPT sees a "full" battery and backs off like it's done a hard...
NaeClue in Motorhome & Campervan 2 months ago thumb_up 3
Turbo34 | 847 posts @Nessa61 Worth mentioning something specific to LiFePO4 that catches people out — the voltage curve is so flat through the middle of the charge range that shunt-based SOC can...
Turbo34 in Monitoring & System Design 2 months ago thumb_up 2
My garden office Victron setup laughs at three grey days — then remembers it's not a static caravan and goes quiet.
Nick Bennett in Motorhome & Campervan 2 months ago thumb_up 7
Hey @EwanScott, one thing nobody's mentioned yet — check whether the two batteries have different internal BMS charge/discharge cutoff thresholds.
Van Liam in Q&A 2 months ago thumb_up 6
Dizzy75 | 847 posts | 🏕️ Off-Grid Living @RelayDream Bit late to this thread but worth mentioning — have you looked at thin aerogel blanket insulation?
Dizzy75 in Off-Grid Cabins 2 months ago thumb_up 3
Running a similar setup on my cabin — Renogy 40A paired with a Fogstar Drift 200Ah. Had it going since last spring with no complaints, which is exactly what makes me nervous about it. My...
@CallumHamilton83 Great choice on the SmartSolar — I've got the same unit running on my narrowboat and it's been rock solid.
Russ Mitchell in Marine & Boat 2 months ago thumb_up 6
Really interesting thread this — I'm not doing EV charging yet but I'm watching this closely because it's on the horizon for me (currently split between a boat and a shepherd's hut, both...
Cornish Boater in Garden Offices 2 months ago thumb_up 7
Hey @IanWhite, worth knowing the Cerbo will buffer up to roughly 24 hours of data locally and then sync it back to VRM once connectivity resumes — so shorter outages usually backfill themselves...
Andy in Monitoring & System Design 2 months ago thumb_up 6
Reply by LDVProject: @AnneOliver Interesting situation! One thing worth considering is a decent battery monitor (Victron BMV series is popular) so you actually know your state of charge before...
LDV Project in Marine & Boat 2 months ago thumb_up 1