Laden vanaf walstroom uitschakelen op Quattro 5000 i.c.m. Cerbo

Been down a similar rabbit hole recently with my Victron setup in the motorhome — trying to get selective shore power charging working without killing the solar input from the MPPT at the same time.

Anyone else had a crack at this using Node-RED on the Cerbo? I managed to bodge together a virtual switch eventually but it took way longer than it should've. The tricky bit is isolating the AC charger side of the Quattro without affecting the MPPT charge path — they share the same battery bus obviously, so you can't just flip one off cleanly.

What I ended up doing:

• Used a Node-RED flow to monitor SOC via MQTT
• Set a threshold (I've got Fogstar Drift LiFePO4s so I keep it around 90% to preserve cycle life)
• Sent a charge-current-limit command to the Quattro via the Cerbo rather than fully disabling charging — keeps things a bit cleaner

Still not perfect though. There's a lag sometimes and I'm not 100% sure it's not occasionally interfering with the MPPT behaviour.

Wondering if anyone's used the ESS assistant differently to handle this, or whether there's a cleaner way through VRM or even just a scheduled charge window. Feels like something Victron could make dead simple in the interface but instead it's hours of Node-RED faffing.

Would be curious what setups others are running — Quattro 5000 or otherwise. Are your LFP banks happy with how you're managing the shore vs solar priority?

@BurnBen mate the thread title's in Dutch but your problem is very much universal — had the exact same headache in my shepherd's hut where I wanted shore power off but MPPT cracking on regardless.

Solved it with a Node-RED flow on the Cerbo — set a virtual switch that monitors grid input and toggles the charger relay without touching the MPPT settings. Took about an hour of head-scratching and one mug of tea going cold.

Key thing: don't try to do it purely through VE.Configure or you'll spend three weekends crying into your Fogstar cells like I nearly did.

Hey @BurnBen, good topic even if the thread title's got a bit lost in translation! 😄

Worth checking your ESS or charge control settings in VRM — you can use the Cerbo's relay outputs or a scheduled charge profile to disable the AC charger independently without touching the MPPT. The key is making sure the MPPT is set to its own charge profile rather than being slaved to the Multi/Quattro's charge state.

If you're on a recent Venus OS firmware, the "charge current control" assistant in VEConfigure gives you much finer control over this. You can essentially tell the Quattro to ignore shore power for charging whilst letting solar crack on uninterrupted.

What firmware version are you running on the Cerbo? That might narrow things down considerably.

@BurnBen on the Quattro with Cerbo, the cleanest approach I've found is using the charge current limit via VE.Bus rather than toggling the charger on/off entirely — that way your MPPT stays completely untouched through the DC bus.

In Node-RED on the Cerbo you can write to com.victronenergy.vebus/.../AcPowerSetpoint or use the grid setpoint if you're running ESS, effectively throttling what the Quattro pulls from shore without interfering with the SmartSolar.

If you're not on ESS (standalone inverter/charger mode), the DVCC charge current knob in VRM is your friend — set shore-side amps low and let the MPPT pick up the slack automatically.

What firmware are you running on the Cerbo? Some of the older builds had quirks with DVCC and shared current sense that made this behave oddly.

@StuCampbell that VE.Bus current limit approach is solid — been running something similar on the boat for a while now.

One thing worth adding: if you've got a Cerbo GX you can also set up a manual switch on the touchscreen via the AC input current limiter in the settings. Dead simple to toggle shore charging down to near zero without touching your MPPT at all.

Also check your charge ignore AC input flag in VEConfigure — that's the nuclear option but sometimes it's exactly what you need for a quick test to see if that's actually where your solar conflict is coming from.