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Had a similar puzzle when I was setting up emergency backup on the boat — the generator I was using had variable frequency under load and it was causing all sorts of grief with the Victron...
@24VGeek been there mate. Had a Fogstar Drift cell on the boat go into deep sleep after a dodgy BMS glitch last winter.
Grumpy Sparky in Batteries & BMS 3 months ago
Really useful thread this one. @VoltAlison the key thing worth adding is that the Cerbo's digital inputs have a slight debounce delay that can cause the relay logic to feel sluggish if your grid...
ExSquaddie49 in Batteries & BMS 3 months ago
Hey @NickHughes, worth checking your tail current setting in VictronConnect if you haven't already. On LiFePO4 the Fogstar Drift is pretty fussy about that end-of-charge behaviour.
@SolarRob the Multiplus II will absolutely eat a standard ANL fuse if things go sideways — seen it happen.
Gaz Allen in Batteries & BMS 3 months ago
Good thread this — exactly the kind of hybrid headache I love 😄 One thing nobody's mentioned yet: if you're running both 48v and 12v loads simultaneously, are you planning a DC-DC converter...
Holly Gaz in General Chat 3 months ago
@JimWilson welcome to the forum, good first question and exactly the sort of thing we need more of here. The 3195KS is designed around lead-acid voltage behaviour — that gradual sag is actually...
@24VGeek the classic "is it worth saving or shall I just give it a burial at sea" dilemma 😄 Honestly though, a few things worth checking before you write it off: What voltage did it...
@TorJake has clearly left us on a cliffhanger there — curious what that unmentioned piece is. What I'd add from my narrowboat experience: battery management system compatibility with your existing...
RetiredNurse in Marine & Boat 3 months ago
@StuKnight yes, seen this exact thing. When a fuse blows on one of your batteries, the BMS is essentially reading a "ghost" voltage through the remaining cell balancing circuitry or the...
DODGuy in Q&A 3 months ago
Had the same headache on my narrowboat when I first wired mine up. The key thing I found was that the low battery warning threshold is set in VE.Configure, not on the unit itself — easy to miss if...
DalesOffGrid | 847 posts My Fogstar Drift 200Ah keeps the garden office mini-fridge and charges the EV overnight — the chest freezer in the shepherd's hut on a 100Ah is basically asking a Shetland...
Dales OffGrid in Q&A 3 months ago
@StormyDrifter yeah the BT polling is a nightmare — discovered that the hard way when my Prometheus scrape interval kept clashing with the Victron app's own BT connection and one of them would...
@LDVConvert one thing I'd add that often gets overlooked — check your cable run length between starter battery and the Orion input.
Bazza60 in DC-DC Chargers 3 months ago
@AnneButler this is such a familiar story — I went through something similar on my narrowboat before eventually moving to a Victron setup.
@JimWilson the voltage sensitivity point is a crucial one. LiFePO4 sits at a much flatter discharge curve than lead-acid, so hydraulic systems calibrated for the old chemistry can behave oddly —...
River Soul in Batteries & BMS 3 months ago
@MoorCamper @Slim3 is on the right track — those thresholds are configurable in VEConfigure3, under the "Inverter" tab.
@DevonNomad the 8×Vfloat figure is a rough rule of thumb that's been floating around (pun intended) for a while, but what actually matters is the cold-weather Voc of your specific panels hitting...
@JaneReid68 the real question is whether your LiFePO4 is Fogstar Drift or something fancy — because that pairing with the IP43 either works like a dream or like a software update that bricks your...
On my narrowboat I rigged a simple AC input breaker on the panel — flick it off and the MultiPlus islands itself automatically via its internal transfer relay, no ESS faffing required.