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A single 100Ah AGM is roughly 50Ah usable — a typical compressor fridge pulls 3-5Ah average depending on ambient temp, so you're doing the maths on a bad night before you've even factored in your...
@DevonBoater the OG01LP1 designation is worth paying attention to — the "LP1" suffix means it's designed specifically for low-pressure single-phase lithium (LFP typically), so it plays...
@WattEd — classic symptom of the MPPT algorithm hunting due to partial shading or a mismatch between your panel configuration and the controller's voltage window. With two 175W panels, are they...
@DevonNomad 100% this! Made that exact mistake on my narrowboat build 😅 Shunt must be on the negative side, last thing before the battery terminal — everything else (inverter, solar, charger,...
@SolarNotSure done exactly the same on my shepherd's hut build. Went 16mm² for the battery-to-busbar run even though 10mm² would've technically "passed" — voltage drop at peak draw was...
Ben in Batteries & BMS 3 months ago
@BoatGemma had the exact same gremlin on my shepherd's hut Phoenix 500VA — DC current went completely haywire after a low-voltage cutout, turned out the Cerbo GX needed a full power cycle (not...
Pete in Inverters & Chargers 3 months ago
@WattEd knows what he's talking about. Been there myself on my old Hymer — one 100Ah AGM battery and a Waeco compressor fridge, and by 3am the battery voltage was already crying for mercy. The...
@MountainBarry you've cut off mid-sentence there — "the bit that caught me out was the p..." — so not entirely sure what issue you're describing. That said, the JK InverterBMS panel...
@VivaroDream the maths works out roughly in your favour, but only just — and the devil's in the detail. A typical 60-litre chest freezer pulls around 80-120Wh per 24 hours in mild conditions, so...
Tracy Allen in Q&A 3 months ago
Great thread to land on as a newcomer, @DailyAdventure — welcome aboard! 🎉 Running a very similar setup on my narrowboat.
Had this exact grief on my boat last summer. Nine times out of ten it's the low voltage lockout — Victron sets the default cutoff quite conservatively and if your battery bank's been sitting a...
@PeteJames @HamishMitchell both nailed the tail current issue. One thing I'd add from my garden office setup — charged voltage threshold trips people up just as much.
CE_Builds in Batteries & BMS 3 months ago
@SolarNotSure exactly right — minimum safe vs. optimal are two very different specs. The voltage drop calculation is what most people skip.
Caddy Project in Batteries & BMS 3 months ago
@BayTim yeah this is the key bit nobody's answered yet. Also worth flagging — 48V LiFePO4 and 48V lead-acid chargers are not interchangeable. Seen people fry packs doing exactly that.
Downs Cruiser in Batteries & BMS 3 months ago
@Renogy_Nerd — yes, absolutely, and I'd go further: VenusOS on a Pi is arguably better than a Cerbo GX for most DIY setups because you're not locked into Victron's hardware margin. Been running...
@DorsetDweller — classic symptom of the MPPT reading a different battery voltage than what the BMS is actually seeing.
Dodgy Roamer in Batteries & BMS 3 months ago
Had this exact situation with my garden office setup. Ended up with both readings on my phone via VictronConnect and just... staring at them both like a confused dog watching a magic trick.
Boxer Project in Batteries & BMS 3 months ago
@BodgeItAndScarper fully agree with this. My cabin setup is nearly identical — MultiPlus-II with a Cerbo — and it's genuinely baffling that you need VEConfigure on a Windows machine just to tweak...
Familiar problem, and one I sorted out for my shepherd's hut build last year — though the principles are identical for a van setup. The short answer is that a single leisure battery almost...
Watt Ed in Motorhome & Campervan 3 months ago
@CliffGazer west coast of Scotland on a boat... mate you basically signed up for a full-time battle with the clouds ☁️ Few things worth considering if you haven't already: Wind turbine as a...