Meine Victron Anlage

Anyone else get absolutely consumed by Victron kit** after starting with something embarrassingly small?

Mine began with a 400W Renogy panel on the garden office roof — told myself that was plenty. Two years later I'm sitting here with 14.4kWp across the cabin and office, a Fogstar Drift 10kWh battery bank that I'm almost certainly going to expand, and a Multiplus-II that cost more than my first car.

The "blue force" is very real and apparently has no off switch.

Current setup for anyone interested:

• 14.4kWp split across two arrays (south + south-west)
• Victron Multiplus-II 5000 as the brain
• Fogstar Drift 48V LiFePO4 — 10kWh for now, eyeing a second unit
• Cerbo GX because obviously you need to obsessively monitor everything on your phone at 2am
• EV charging via a rather hacky integration I'm not entirely proud of

The EV side is where it gets genuinely interesting — managing charge sessions around solar production without just hammering the batteries is a proper puzzle. Currently using some Node-RED automation that works about 80% of the time, which I'm told is "fine" by people who haven't seen the other 20%.

Thinking about adding another 4kWp on the cabin's east-facing roof — anyone gone down the mixed-orientation route with separate MPPTs and actually found it worth the hassle, or does the asymmetric production just cause headaches?

What are others running for storage capacity relative to their panel count — is 10kWh per ~7kWp a sensible ratio or am I understoraged

@Chopper54 mate, "plenty" is the most dangerous word in off-grid vocabulary — right up there with "that'll do" and "I'll just add one more battery." 😂

Started with a single Victron SmartSolar 75/15 on the narrowboat, told myself it was temporary — three years later I've got a Multiplus-II, a Cerbo GX, four Fogstar Drift 100Ah cells, and a spreadsheet that my wife has firmly described as "a cry for help."

The real trap is the VRM portal — once Victron lets you monitor everything in granular detail, you immediately realise how inadequate everything is, and suddenly you need more panels, more storage, better DC cabling...

It's basically a hobby that bills itself as a money-saving exercise. Spoiler: it is not a money-saving exercise.

@FETFan "that'll do" is basically how Victron designed their entire product ecosystem — each purchase quietly whispers "but have you seen the next model up?"

@Chopper54 Same rabbit hole here — started with a single 200W panel thinking I'd just run a lamp and charge a laptop in the garden office. Fast forward 18 months and I've got a Victron Multiplus, Cerbo GX, and three Fogstar Drift 100Ah batteries wired up like something NASA would be mildly impressed by.

The thing is, I knew it was happening. Watched myself do it. Each piece of Victron kit just exposes the next gap in your system — the MPPT "suggests" you need more panels, the Cerbo shows you exactly how much you're undersized, it's almost predatory.

Worth it though. Garden office runs entirely off-grid from about April through October now. Can't argue with the data when VRM is logging every watt.

@Chopper54 the garden office is where it always begins, isn't it. Mine was identical — one modest panel, a cheap PWM controller, a leisure battery from a caravan that had seen better days. Told myself it was "just for the lights."

That was three years ago. I now have a Victron Multiplus II sitting in the boat bilge, a Cerbo GX talking to everything, and Fogstar Drift cells wired into a 200Ah bank that I built myself on a rainy Sunday in February.

The cruel part is that Victron's ecosystem is genuinely excellent — so every upgrade feels completely justified rather than impulsive. You're never being silly, you're just optimising.

My wallet knows the truth though.