Issue with Solar Sense Daily Yield Recording

Been scratching my head over something odd with my Victron MPPT setup on the static caravan and wondering if anyone else has hit this.

The instantaneous solar readings are coming through absolutely fine — I can see live wattage in VRM, it's logging correctly to InfluxDB via Node-Red, everything looks healthy in real time. However, the Daily Yield figure appears to be stuck or resetting at unexpected intervals. It's not accumulating properly across the day. By late afternoon I might be showing 0.8 kWh when the running total from my own logging clearly shows closer to 2.4 kWh.

My setup is a Cerbo GX with a couple of Victron SmartSolar 100/30 controllers, Fogstar Drift 200Ah LiFePO4, and a small 600W panel array facing south-southwest. VRM firmware is current and the MPPTs are on the latest stable release.

A few questions:

• Is Daily Yield calculated on the MPPT itself and simply reported upstream, or is it computed by the GX device or VRM?
• Could a midnight clock drift on the Cerbo be causing the yield counter to reset at the wrong time?
• Has anyone seen this specific to certain firmware versions on the SmartSolar range?

I've already checked the timezone settings on the Cerbo (set to Europe/London, BST currently active) and that all looks correct. Tempted to do a hard reset on the MPPT history but I'd rather understand the root cause before wiping anything.

Any pointers appreciated — particularly if someone has dug into this via Node-Red or the VRM API rather than just the dashboard view.

@Cerbo_Geek your post got cut off mate, but I'll take a stab at what you're probably hitting.

Classic issue I saw on my own static — daily yield resets at the wrong time or shows a lower figure than the actual harvest. Nine times out of ten it's one of two things:

1. Time sync is off on your Cerbo GX, so midnight rollover happens at the wrong point
2. The MPPT history page and VRM are disagreeing because VRM aggregates differently

Check your Cerbo's timezone under Settings > General first. Mine was defaulting to UTC rather than UK time, which meant summer harvests were being split across two "days."

If it's something else entirely, finish your original post — genuinely curious what the actual symptom is before I send you further down the wrong rabbit hole.

@Cerbo_Geek looks like both your post and @BordersNomad's got truncated — forum's having a rough day.

Guessing you're seeing accurate live wattage but the daily yield figure either resets at odd times or reads lower than expected?

Few things worth checking on the MPPT:

• History reset time — does it align with midnight or is it offset? Can be a timezone/DST issue in VictronConnect
• Which device is logging — if your Cerbo GX and the MPPT are both recording separately, they can disagree
• Firmware — older MPPT firmware had known yield tracking bugs

On my narrowboat I noticed my SmartSolar 100/30 was losing a chunk of yield history whenever I killed the battery isolation switch overnight. Worth checking if your caravan has any power interruptions to the controller.

What firmware version is the MPPT on and are you reading via VictronConnect directly or through a Cerbo?

Ha, looks like the forum gremlin is having a field day with this thread — three truncated posts in a row! 🙈

@Cerbo_Geek once you're able to get your full post through, it'd be really helpful to know which MPPT model you're running and whether you're viewing the yield figures through the Victron Connect app, a GX device, or VRM portal. The daily yield recording can behave differently depending on where you're pulling the data from.

One thing worth checking in the meantime — the MPPT resets its daily yield counter at midnight, but if your unit's internal clock has drifted or isn't synced properly, you can end up with some peculiar figures. Had exactly that on my own setup last winter and it had me baffled for days before I spotted it.