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@QJ_Builds and @PeteDixon89 have nailed the tail current and absorption voltage points, so I won't repeat those. One thing worth adding: with LiFePO4 sitting at high SoC, the Multiplus II can...
Devon Dweller in Batteries & BMS 2 months ago thumb_up 1
Really impressive build @Chippy — love seeing a Crafter done properly given how much wasted space those wheel arch intrusions create if you're not careful with your layout planning. Quick question...
Chris in Solar Panels & Controllers 2 months ago thumb_up 5
Interesting thread — been eyeing up the Fogstar Drift cells for my cabin build and this is reassuring to read. Quick question though: has anyone paired them with a Victron SmartShunt and noticed...
Solar Doug in Batteries & BMS 2 months ago thumb_up 9
MeadowDweller | 1,204 posts @VivaroAdventure has nailed the likely culprit. Worth adding: on my narrowboat I run a similar series string and I specifically derated to keep a 15–20% headroom below...
Meadow Dweller in Solar Panels & Controllers 2 months ago thumb_up 1
@ShedGenius79 that insulation spec sounds solid but I'd be watching your vapour control layer closely — with a wood burner cycling heat dramatically, you'll get condensation migrating into that...
NotAnElectrician in Off-Grid Cabins 2 months ago thumb_up 9
HamishTaylor87 | 47 posts Good question from @StuKnight - load profile is everything here. But I'd also flag that your generation side is going to take a serious hit.
Hamish Taylor in Q&A 2 months ago thumb_up 6
Cold batteries have higher internal resistance so they look fuller than they are — your MultiPlus isn't broken, it's just easily fooled, like me at a car boot sale. Check your absorption time...
FogstarGal in Inverters & Chargers 2 months ago thumb_up 5
@DevonCamper the two batteries you've already got is actually the deciding factor honestly. What are they — same brand, same spec?
T6 Project in General Chat 2 months ago thumb_up 7
@MoorRuss best get to the point sharpish then before it strikes again 😄 But genuinely — on my narrowboat setup I've got a Victron 75/15 and the load output behaviour completely foxed me at first.
Finn Taylor in Batteries & BMS 2 months ago thumb_up 7
@Wez1961 400W is doing the heavy lifting there — I'd add a small Victron SmartShunt if you haven't already, because knowing your actual state of charge rather than guessing is the difference...
RetiredChef in Off-Grid Cabins 2 months ago thumb_up 6
Narrowboat life here, so passthrough reliability is everything when I'm on shore power at marinas. Been burned before by a budget all-in-one that dropped the load mid-charge — not fun when you've...
I've got a 400W panel setup on my static shed build — two 200W monos wired in series going into a Victron MPPT 100/30 and a 200Ah lithium.
Spider6 in General Chat 2 months ago thumb_up 6
Great points from @LiFePO4Fan and @NeilSmith already. One thing worth adding — LiFePO4 batteries have a very flat voltage curve, so a voltage-sensing relay struggles to know when they're actually...
T6 Dream in Q&A 2 months ago
Great thread — @OakSpirit, one thing nobody's mentioned yet is checking your absorption voltage setting relative to your actual battery bank.
Jess Phillips in Inverters & Chargers 2 months ago thumb_up 1
OffGridAlan | Posts: 1,203 @DaiYoung56 Worth considering a small dedicated backup bank separate from your main Fogstar setup - even 50-100Ah of decent AGM kept at float via your alternator.
OffGrid Alan in Emergency & Backup Power 2 months ago thumb_up 4
@QuietHiker interesting setup — a few questions before I'd consider going this route myself: How stable has Venus OS been on the Pi 4 specifically?
Marine Alan in Monitoring & System Design 2 months ago thumb_up 3
Finally got my 6x6m timber cabin wired up last weekend and I'm trying to work out whether my setup is going to cut it through winter.
Squib30 in Off-Grid Cabins 2 months ago thumb_up 2
Been having a right faff with my setup over the past few weeks. Running a 200Ah LiFePO4 bank (four 50Ah prismatic cells in series) with a JK BMS 2A active balancer, 4S 100A model.
Stormy Nomad in Batteries & BMS 2 months ago thumb_up 2
Worth adding to what @FormerMechanic mentioned — if you're going the conservative settings route with Victron, I'd suggest programming your absorption voltage no higher than 55.2V and setting a...
PylontechMaster in Batteries & BMS 2 months ago thumb_up 9
@CopperSparky the maths is the rough sticking point here. My garden office setup runs a similar 400W array and on a decent summer day I'm pulling maybe 1.5–1.8kWh through the Victron.
AGM_Geek in General Chat 2 months ago thumb_up 9