Anyone else obsessing over their Victron Cerbo GX dashboards at 2am?

Right, so here's how this started. I'd just finished wiring my tiny house battery bank — four 280Ah LiFePO4 cells from Fogstar arranged in a 24V configuration — and the moment I fired up VRM Portal for the first time, I was done for. That was six weeks ago. I've genuinely lost sleep staring at charge curves.

The thing that's pulled me in specifically is trying to correlate the state of charge percentage shown on the Cerbo against what my cells are actually doing individually. I've got a JK BMS feeding data alongside the Victron kit, and the two systems tell slightly different stories. The Cerbo reads 94% whilst the JK is flagging a cell voltage spread of about 18mV across the four cells — which to me suggests top balancing isn't quite where it should be, and the 94% figure is therefore a bit optimistic.

My actual question for the forum: are others manually cross-referencing their BMS data against VRM, or have you found a reliable way to pipe JK BMS figures directly into the Cerbo so everything lives in one place? I've read about using a Raspberry Pi or a JKBMS-to-Victron script, but the documentation feels scattered. Would love to know what's actually working in real installs rather than what looks promising in a GitHub readme at midnight.

@DriftGal — absolutely yes, and I'll tell you where it gets properly addictive: once you've got the Cerbo logging to VRM at 1-minute intervals, you start correlating everything.

My garden office setup runs a similar Fogstar bank (though I went 48V with eight cells) and I spent an embarrassing amount of time last winter overlaying grid import events against my EV charging sessions on the VRM advanced tab.

The thing that really keeps me up is the State of Charge vs voltage divergence — particularly during bottom-balancing cycles. When one cell lags by even 20mV during a discharge curve, I'm immediately building a spreadsheet.

Worth enabling the DVCC shared current control if you haven't already — makes the Cerbo genuinely useful rather than just pretty graphs. Though admittedly "pretty graphs at 2am" is arguably its own valid use case.

@DriftGal oh goodness yes, I'm absolutely guilty of this! I've got my narrowboat hooked up to VRM and I genuinely lost about three hours one night just watching the solar yield graphs from the previous week, trying to work out why Tuesday was lower than Monday (it was clouds, obviously, but I needed the data to confirm it 😂).

What I'm obsessed with right now is setting up custom widgets on the dashboard — do you have yours configured yet? I've got SOC, battery temperature and grid/shore power all on one view.

One question though — with your 24V Fogstar setup, are you finding the Cerbo picks up the cell-level data properly, or just the overall bank voltage? I'm only seeing bank-level on mine and wondering if I'm missing a setting somewhere.

@DriftGal Three years ago I wired up my cabin's first proper Victron setup — MPPT, Multiplus, the lot — and I genuinely rang my mate at midnight to tell him my SOC had hit 100% from solar alone for the first time. He was not pleased.

The 2am dashboard spiral is real. What makes it worse is when you start building custom widgets in VRM and suddenly you're correlating yesterday's cloud cover with your Fogstar pack's charge curve like some kind of unhinged energy meteorologist.

My actual advice: set your phone notifications for genuine alerts only — low SOC, high temperature, grid failure. Otherwise you'll be checking it every 20 minutes and calling it "monitoring" when really it's just anxiety with better graphs.

The motorhome taught me this the hard way across three winters.

@DriftGal the 2am thing is real but honestly the dangerous phase for me was when I set up custom alarms on VRM. Suddenly it wasn't just checking — my phone was actively summoning me at stupid hours because a cell was 0.02V out of balance.

With LiFePO4 that flat discharge curve makes the dashboard almost useless as a gauge anyway, so you end up watching watt-hours consumed instead and doing mental maths about remaining capacity. Fogstar cells are decent quality so your balance should stay tight, but I'd recommend setting up a proper historical trend view early on — catching a drifting cell before it becomes a problem is worth the obsession.

The Cerbo's tank/temperature inputs are what pulled me deeper. Once you're monitoring battery temps through winter it never really stops.