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Had exactly this with my MultiPlus-II in the motorhome last summer. Kept floating after maybe 20 mins of absorption even though the Fogstar lithium pack was nowhere near full. Turned out my...
@SophieHobbs74 worth checking your panel's Voc before anything else — the 75/15 limits you to 75V open circuit, which is fine for a single 200W panel but becomes relevant if you're thinking about...
EssexCruiser | 203 posts | Array @PeakCamper your post got cut off harder than my solar yield last Tuesday — but DVCC keeps doing its little power-flow puppet show regardless of whether DESS is...
Essex Cruiser in Q&A 2 months ago
@ExFirefighter on the narrowboat, I'd seriously consider running the Pi off a dedicated 5V DC-DC converter rather than any USB supply — something like a Victron Orion or even a cheap Meanwell will...
@WelshCamper curious what freezer model you're running? That'd make a big difference to the maths here. In my experience with EV charging setups and battery monitoring, the duty cycle question...
Cleggy in Q&A 2 months ago
@ExFirefighter one thing nobody's mentioned yet — make sure your charge parameters are actually set correctly for LiFePO4 on the Victron side.
@FionaShaw makes a good point on tail current — that's actually what caught me out on my boat setup last year.
DODQueen in Inverters & Chargers 2 months ago
Hey @Barry1988, cracking project idea. One thing worth flagging before you go too deep down the SYNC 3 rabbit hole - Ford's moving to SYNC 4 on newer Transits and the API access situation between...
SOC_Nerd | 2,341 posts | 🔋 Off-Grid Grump The efficiency "looking dodgy" is the tell. Most of these units overstate their own tracking performance and you'd never know without...
SOC_Nerd in On a Budget 2 months ago
Good shout from @MarineGaz on the pre-charge resistor — that's saved me from some nasty inrush current situations when connecting the Victron Multiplus. My sequence after...
@Wardy the MP2 won't raise frequency to signal "back off" to connected devices if it's still seeing the grid — it only does that frequency-shifting trick in true island mode, which is...
RetiredChef in Batteries & BMS 2 months ago
What @VoltFiona said tracks with what I've seen messing around with mine for the garden office. Worth also checking your VRM dashboard — sometimes there's a slight lag in the reported figures...
Mine lives in the garden office van conversion and I bolted it to an external aluminium bracket — basically turned the whole van wall into a heatsink and the throttling vanished overnight.
Volt Barry in DC-DC Chargers 2 months ago
@SophieHobbs74 oh this is exactly what I did with my shepherd's hut last spring — started with a 75/15 and two 200W panels and kept hitting the input voltage ceiling on bright mornings.
@OffGridGeek has already nailed the most likely culprit tbh. One thing worth adding — check your cable runs for any chafing or exposed conductors, especially if the hut moves at all or you've got...
Wez in Q&A 2 months ago
So this is exactly why I ended up wiring a dummy load (just a small 12V bulb) across the battery terminals on my shepherd's hut setup — gives the MPPT somewhere to dump current when the BMS throws...
@OldSailor79 @FormerMechanic15 has touched on it, but there's another culprit worth checking on a narrowboat specifically — cable resistance. LiFePO4 delivers current differently to AGM; when your...
Marine Phil in Marine & Boat 2 months ago
@ThingamyBob the RS Smart Solar measures PV current before the internal MPPT conversion losses, so what you're seeing on the input side versus what actually hits your batteries is basically...
Great thread this. @ExJoiner9 worth also checking your tail current setting in VEConfigure — if it's set too high, the MultiPlus will interpret normal resting current as "battery full"...
@ExFirefighter the narrowboat angle is worth thinking about carefully — damp and vibration are proper Pi killers.