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@BenJackson had almost exactly this with my setup last spring — turned out my State of Charge readings were lying to me because I hadn't properly calibrated the BMV-712 after swapping battery...
ExFarmer90 in Inverters & Chargers 7 months ago thumb_up 7
@DuctTapeDave that's a bit cynical but I get where you're coming from. My situation is similar to @PennineNomad — I've already got SmartSolar controllers sorted on my static caravan setup, so the...
HMK_Sparks in Inverters & Chargers 7 months ago thumb_up 4
@LazyFisher this is almost certainly your charge current limit setting in VictronConnect — the MultiPlus sees the alternator voltage spike, tries to push current into the lithium, the BMS...
Boycie in Inverters & Chargers 7 months ago thumb_up 6
Really interesting thread this. One thing worth adding — if you're pulling cell voltage data via Node-RED on a Cerbo GX, you can calculate the delta yourself and push a custom MQTT topic back onto...
Ollie in Batteries & BMS 7 months ago thumb_up 8
Yeah, the relay is almost certainly your bottleneck. A voltage-sensing relay just sees "battery connected" and dumps whatever the alternator decides to give — problem is LiFePO4 sits at...
LiFePO4Fan in Q&A 7 months ago thumb_up 8
Been running a Victron MultiPlus-II 3kVA/24V in my garden office setup for about eight months now. Works a treat for general loads but I'm getting nuisance trips whenever the mini-split heat pump...
Downs Wanderer in Inverters & Chargers 7 months ago thumb_up 3
RetiredNurse22 | 634 posts Good points all round here. One thing I'd add from experience running my own off-grid setup — with glamping lets, think about seasonal variation.
RetiredNurse22 in Q&A 7 months ago
@DebbieEvans January is exactly where solar-only setups fall apart — I've got a 48V LiFePO4 bank (Fogstar cells, 280Ah) paired with a 600W array and even that struggles mid-winter with three...
FormerMechanic68 in Emergency & Backup Power 7 months ago thumb_up 4
@BrianKnight86 raises something important, but what nobody's mentioned yet is shared DC busbar sizing.
Taffy29 in Batteries & BMS 7 months ago thumb_up 3
Been running my garden office off-grid for about 18 months now. Currently got a 400W solar array feeding into a Victron SmartSolar MPPT, with a 200Ah Fogstar lithium battery.
Wez in Off-Grid Cabins 7 months ago thumb_up 1
@Tel1997 my Victron SmartSolar basically paid for itself in smug satisfaction alone when my emergency backup bank stayed topped up through a full week of November gloom that would've had the old...
Partner Camper in Marine & Boat 7 months ago thumb_up 3
@ThingamyBob it doesn't care what's printed on the tin, it cares about the voltage curves — my van's cobbled-together Renogy cells couldn't care less what brand name the BMS thinks it's babysitting.
Peak Nomad in Batteries & BMS 7 months ago thumb_up 9
Worth adding — if you're running a BMS with a charge disconnect relay, that can silently pull the load away from the MPPT and it just sits there looking confused showing "off".
Berlingo Life in Inverters & Chargers 7 months ago thumb_up 3
What @BoatPaddy and @FormerCop are describing matches exactly what I noticed on the boat last winter. The Orion would just...
Callum Hobbs in Motorhome & Campervan 7 months ago thumb_up 6
Mine's a MultiPlus-II 24/3000 and every winter it starts rejecting the bulk charge like it's had a bad pint — sits there blinking amber until I give the van a kick (literally). Running Fogstar...
Luton Build in Inverters & Chargers 7 months ago thumb_up 6
PanelTina | 634 posts | ☀️ Continuous cruiser, ex-marina refugee | Four Counties Ring @HalfAJob brilliant timing on this thread - I made the jump from shore power dependency to full solar about...
Panel Tina in Marine & Boat 7 months ago thumb_up 4
@CliveCrane @BoxerProject yeah the thread's clearly having a moment — like when my static caravan's inverter started throwing half-error codes last winter, you just work with what you've...
Dale Spirit in Batteries & BMS 7 months ago thumb_up 2
@OffGridHamish this is worth digging into the Victron docs properly rather than guessing. The MP 48/8000 datasheet specifies a DC input low shutdown of 44V by default, but — and this is the bit...
Derek Dixon in Garden Offices 7 months ago
Good point from @ThingamyBob — the chemistry question is the key bit really. From what I've seen messing about with mine in the van, the Lynx NG BMS is doing cell voltage monitoring and balancing...
Wonky Mender in Batteries & BMS 7 months ago thumb_up 2
@Smudge raises a good point about persistence — does this apply to the Cerbo GX specifically, or are some of you running Node-RED on a separate Pi alongside it? On my boat I've got a Victron Cerbo...
Max Frost in Monitoring & System Design 7 months ago thumb_up 3