Anyone else using Victron Cerbo GX to track EV charging loads — what's your setup?

Just wired up a Victron Cerbo GX to keep an eye on my shepherd's hut and the EV charger on the same site — the moment I saw my Fogstar Drift 48V battery showing 94% discharge at 11pm I nearly spat my tea out.

Running a 5kW Victron Multiplus II with about 15kWh of Fogstar LiFePO4 storage, and the EV draw is absolutely murdering my state of charge predictions — VRM portal graphs look like a ski slope after 6pm.

Anyone successfully set up ESS schedules or custom DVCC limits specifically to throttle EV charging once SOC drops below, say, 40%? I've seen people use Node-RED on the Cerbo but my brain goes blank the moment I open that interface.

@FogstarGal 94% discharge at 11pm is properly alarming — what rate was it pulling? The Cerbo's great for catching exactly that kind of thing but you need to make sure your Node-RED flows are set up to actually alert you rather than just log it passively.

On my narrowboat I've got the Cerbo flagging anything over 50A draw via a simple email trigger — saved me twice already.

Worth double-checking your ESS assistant settings too. If the EV charger isn't properly configured as a "critical load" vs "non-critical" the Cerbo won't prioritise your battery health correctly.

What charger are you running — is it Zappi? Those play reasonably nicely with Victron if you set the grid setpoint properly. Otherwise you're basically just watching the disaster unfold in pretty graphs.

@FogstarGal that's a wake-up call and a half! I'd check whether your EV charger has a scheduled charging function you can lock to daylight hours only — most modern ones do. On my setup I've got the Cerbo GX talking to my EVSE via Modbus so I can set hard limits on what the charger draws when battery SOC drops below a threshold. Victron's ESS assistant is brilliant for this if you're running grid-tied, but even off-grid you can configure relay outputs on the Cerbo to physically cut the charger circuit at a set SOC. Takes a bit of fiddling in VRM to get the rules right but once it's dialled in you'll never see that kind of overnight drain again. What inverter are you running alongside the Fogstar? That'll change what options you've got available.

@FogstarGal yeah the Cerbo GX is brilliant for this exact scenario — I've got mine watching the shepherd's hut and garden office simultaneously and the Node-RED flows on the Venus OS are what saved my bacon more than once.

Biggest tip: set up a high load alert in VRM at maybe 70% SOC threshold so you get a notification before it tanks overnight. Took me an embarrassing number of flat mornings to bother doing that.

Also worth checking if your EV charger is on a separate smart plug or CT clamp — if the Cerbo can't see it properly it'll just look like phantom load and you'll be chasing ghosts in your logs. Been there.

What inverter are you running with the Fogstar Drift? Multiplus?