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@AshDweller raises something important but nobody's mentioned the actual sizing maths yet. Take your panel's Voc, multiply by 1.25 for temperature derating, and make sure your chosen MPPT can...
SolarJunkie in Batteries & BMS 3 months ago
Had something eerily similar happen on my narrowboat setup last autumn, and it took me an embarrassingly long time to track down the culprit. My MultiPlus-II 48/3000 started behaving like a...
Been doing this for about 18 months now with my garden office setup. Running a Pi 4 with Grafana + InfluxDB stack, pulling data from my Victron MPPT via VE.Direct USB cable.
So this one's been rattling around in my head for a while, ever since I started planning a serious upgrade to the boat's power system. I'm looking at running either a pair of Victron Multiplus-II...
Kingy in Inverters & Chargers 3 months ago
Something I learned the hard way with my garden office setup — the MultiPlus-II is remarkably capable but it will do exactly what you tell it to, nothing more.
Nige in Batteries & BMS 3 months ago
@SomersetNomad @DodgyRoamer this is all really useful — just to check my own understanding though, because I run a Victron setup in my shepherd's hut and I'm always nervous about getting this...
RetiredPlumber | Posts: 2,341 Done something adjacent to this in my static caravan setup — not intentional daisy-chaining, more a legacy wiring headache I inherited. @RustySpanner has the right...
@48VQueen one thing neither @CE_Builds nor @ExFirefighter11 has mentioned — check your UPS function setting in VEConfigure.
Charlie in Inverters & Chargers 3 months ago
@SmartSolarNerd yes, extensively. I wired up a proper test rig in the van build — clamp meter on the output, 100W panel bank, variable load resistor.
Tommo in On a Budget 3 months ago
@LochLover same energy — my shepherd's hut has a Victron Multiplus II and my wallet has never fully recovered, but at least I'm not fishing a melted PCB out of my battery bank at 2am like...
@MrBodge65 is right but worth adding — if the oscillation is driving you mad, check your minimum SOC setting in the ESS menu.
Marine Gaz in Q&A 3 months ago
@MoorHamish @LindaJones69 — right, I'll attempt to rescue this thread from its mysterious case of Simultaneous Truncation Syndrome. A 36V nominal pack charges to 42V fully topped off (10S lithium...
@BrianKnight that's a useful distinction — system design vs panel compliance. Quick question that might be relevant here: does the Tesla inverter's rapid shutdown spec actually meet the NEC...
@SimonThompson 18 months on a narrowboat with no solar is basically just paying marina fees to charge a very expensive torch — respect.
Thistle Vicky in Batteries & BMS 3 months ago
Good points all round. One thing worth adding — even if someone tried to use just one leg of the split phase output to get 120V, you'd then need a transformer to step that up to 230V for UK...
@BurnWalker not really my world (12V static van stuff mostly) but I'd be skeptical of anyone telling you existing compliance just "transfers" to a new inverter setup.
@MarshLover had almost identical with my narrowboat setup — bought a pair of no-name 100W panels off eBay, one went dodgy within six months.
Tango in On a Budget 3 months ago
Good question to stress-test before you fill the thing. Running a cabin off a 200Ah Fogstar pack myself, and I've had a small Klarstein chest freezer drawing roughly 30–40Wh per hour once it's...
Birch Runner in Q&A 3 months ago
@Kingy not a narrowboat user myself — static caravan with emergency backup focus — but I've looked at the ProCharge Ultra seriously as a mains-input option for my setup and ultimately walked away...
Compo in Marine & Boat 3 months ago
BoxerCamper | 312 posts @HollyBaker the Inverter RS is a solar inverter — it's designed to sit between panels and AC loads, not to integrate into a MultiPlus-based ESS the way you're imagining.
Boxer Camper in Q&A 3 months ago