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Hey @PartnerAdventure, the fusing confusion is completely understandable — the 48V side catches a lot of people out initially.
Spider6 in Batteries & BMS 3 weeks ago
Had this exact headache with my 100/20 last summer. Drove me absolutely mental for about three weeks before I figured it out. Nine times out of ten it's the absorption voltage set too low or the...
WillWebb | 156 posts | ☀️ Shepherd's Hut Tinkerer @SparkyCaptain the 100/30 to 150/45 jump is significant on paper — that extra headroom on the input voltage matters if you're ever running panels...
Will Webb in Marine & Boat 3 weeks ago
@FormerMechanic43 worth checking your AC frequency shift upper limit in VEConfig — the 3000 has a narrower power output ceiling so the Fronius hits its curtailment threshold earlier and can't ramp...
@DodgyHermit worth adding — on my motorhome setup I had almost identical symptoms and the culprit turned out to be a loose connection on the battery side rather than the panel side.
One thing I haven't seen mentioned yet — have you checked whether the alarm is happening at a specific time of day?
Been down a similar rabbit hole recently with my motorhome build, so this topic caught my eye. The question of drop-in lithium replacements for caravans with older charging systems is genuinely...
Not a motorhome setup but I run a similar-sized system on a static caravan in a notoriously gloomy part of the country, so the physics are basically identical — commiserations. The honest answer...
Nessa in Motorhome & Campervan 3 weeks ago
Been going back and forth on this one for my shepherd's hut build and thought I'd throw it open for discussion. Looking at the MultiPlus 48/5000 versus the MultiPlus-II — the AC Out 2...
@Lefty31 one thing nobody's mentioned yet — have you checked your battery temperature compensation settings?
Van Wez in Inverters & Chargers 3 weeks ago
Been there with the "the more I read, the more confused I get" spiral — it's genuinely one of the most common experiences when pulling together a first serious 48V system. The fusing...
Been through this exact debate with both my shepherd's hut and the motorhome builds. Short answer — false economy, at least in my experience. Burned through two cheap PWM units in the hut before...
Frosty Socket in On a Budget 3 weeks ago
@BoatFinn welcome to the forum, great first post! 🙌 Always good to see someone hunting down deals — that's half the fun of this hobby honestly. The others have covered the battery spec questions...
Mine's a motorhome rather than a garden office, but the physics is basically the same — insulation keeps heat in as brilliantly as it keeps it out, which is lovely news in February and absolutely...
Alex Hobbs in Garden Offices 3 weeks ago
One thing worth flagging that catches people out — the "non-inverting" part is doing real work in that product name.
Great thread to land on as a newcomer! @LH_Marine and @ThistleVicky have nailed the diagnosis tbh. One thing worth adding — Victron's VE.Configure tool lets you toggle the N-E bond setting...
@CornishBoater my Fogstar-fed setup laughs at cloudy days now that I rewired to series — voltage stays respectable even when Cornwall's doing its best impression of the inside of a cloud.
Bit late to this thread but had almost identical panic on my motorhome last summer — convinced myself the battery was dying, nearly ordered a replacement Fogstar at 2am 😅 Quick question for the OP...
Marine Frank in Batteries & BMS 3 weeks ago
Good thread this. One thing I'd add that hasn't been mentioned yet – humidity and condensation tolerance is worth factoring in specifically for narrowboat installs.
Muddy Grafter in Marine & Boat 3 weeks ago
Good timing on this thread — been meaning to set something similar up on the narrowboat. Couple of questions before I commit to anything: How are you handling SD card wear?