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Seen this on my narrowboat setup — the MultiPlus-II can get a bit twitchy when the Fogstar's BMS internal resistance changes as cells warm up during the tail-end of absorption.
MrBodge65 in Batteries & BMS 4 months ago thumb_up 2
@MultiPlusFan three days is where the MultiPlus really earns its keep — that PowerAssist and seamless transfer switching is genuinely brilliant when the grid wobbles back intermittently.
Titch in Inverters & Chargers 4 months ago thumb_up 7
Good shout from @Scouse12 and @MultiPlusNerd on the sensor placement — that's caught a few people out.
Compo55 in Batteries & BMS 4 months ago
My 100/30 keeps throwing a "battery safe" strop every time the Fogstar 200Ah drops below 20% — cuts out completely rather than just throttling back like a sensible adult. Running 200W of...
ExFarmer21 in General Chat 4 months ago thumb_up 6
@DaiBennett same setup here — 200Ah Drift on a 58ft trad stern. One thing worth checking is your Orion-Tr absorption voltage.
Double-checking the ground connection is worth it too — had my Cerbo doing its best impression of a brick because the negative was barely kissing the busbar after a rewire.
Just updated my Cerbo GX to v3.40 last week and now my MPPT 100/30 is throwing a low battery warning at 12.6v, which it never did before.
Rob Robinson in General Chat 4 months ago thumb_up 1
So I've finally started putting together my little 20m² timber cabin up in the Scottish Borders and I'm hitting a wall trying to work out how big the battery bank needs to be.
Zoe Burns in Off-Grid Cabins 4 months ago thumb_up 4
Hey @HeatherOllie! Sounds like a solid setup. One thing worth checking is whether your split-charge relay is voltage-sensing or a basic relay, as this makes a big difference.
Tim Knight in Motorhome & Campervan 4 months ago thumb_up 7
DalesSolar | 📍 North Yorkshire | Posts: 1,243 Good timing on this thread — I've been meaning to post something similar.
Dales Solar in General Chat 4 months ago thumb_up 1
@DailyConvert what AGMs are you running? That makes a big difference to the profile. On my narrowboat I've got a 200Ah Elecsol carbon AGM bank — had to tweak the Victron presets quite a bit from...
Caddy Project in Marine & Boat 4 months ago thumb_up 2
Seen this a fair bit — the Daly Smart BMS UART comms can get flaky when the onboard temperature drops below roughly 5°C, even if the cells themselves are fine.
Vivaro Wanderer in Batteries & BMS 4 months ago thumb_up 3
Just had a three-day power cut and my Victron MultiPlus 12/3000/120 barely broke a sweat keeping the fridge, router, and a couple of lamps going off a 200Ah Fogstar Drift lithium — honestly felt...
MultiPlusFan in Inverters & Chargers 4 months ago thumb_up 1
@Jess1989 Series wiring is your enemy with partial shade — one shaded cell drags the whole string down.
12V_King in Q&A 4 months ago thumb_up 2
@DawnJones74 @BatteryEmma — I went through something similar on my setup. Ended up separating the MPPT from the inverter entirely, which is honestly what I'd recommend to anyone.
Great points all round. Just to add something nobody's touched on yet — ambient temperature matters as much as the clearance itself.
Marine Callum in Solar Panels & Controllers 4 months ago thumb_up 8
@StormyNomad already covered DVCC which is the obvious one, but something that tripped me up on my shepherd's hut build — make sure the VE.Can termination resistors are actually in place at both...
Marsh Lover in Inverters & Chargers 4 months ago thumb_up 6
I've been piecing together a system for my Transit camper conversion and I keep going back and forth on whether to go 12V or 24V for the main battery bank.
Devon Camper in General Chat 4 months ago thumb_up 4
Good points from everyone so far. One thing I'd add — even if you get the voltage curves dialled in and sort the comms situation @WelshSolar mentioned, don't overlook the current sensing...
Finn in Batteries & BMS 4 months ago thumb_up 1
PanelTina | 847 posts @VickyWard oh the AGM-to-lithium moment is properly eye-opening isn't it! I've got a single Drift 100Ah in my van and I keep telling myself I don't need a second one...