2024 TAB 400 Black Canyon – Intermittent Factory Solar Issue (Looking for Other Owners' Experiences)

GordoB
GordoB Member Posts: 5
in Battery/Electrical & Solar

I'm hoping to tap into the experience of other 2024 TAB 400 Black Canyon owners with the factory-installed Victron solar system.

I've been working directly with nuCamp Technical Support for the past couple of weeks, and they've been very responsive, but we haven't yet identified the root cause. I'm hoping other owners may have seen something similar.

My trailer

  • Factory-installed flexible roof solar panels (nuCamp advised mine are Sunflare Flex SI310 310 W panels)
  • Two roof panels
  • Victron SmartSolar MPPT 100/50 controller
  • Victron SmartShunt

Symptoms

The solar system behaves very strangely:

  • Solar charging works normally during parts of the day.
  • During the brightest / warmest part of the day, the Victron controller frequently changes to State = OFF and charging stops.
  • Later in the afternoon or evening, the controller often wakes up on its own and resumes charging.
  • This pattern has repeated over multiple days.

Diagnostics completed

With the help of an electrical engineer (and a lot of patience!), we've completed quite a bit of troubleshooting:

  • Battery side of the MPPT is normal.
  • Inline PV fuse tested good and was replaced as a precaution.
  • MPPT communicates normally via Bluetooth.
  • We disconnected the incoming PV wiring from the MPPT and measured the incoming panel voltage directly.
  • During one failure event, the incoming PV wiring measured only 0.6–0.7 V, suggesting the controller was not receiving usable voltage from the solar array at that time.

I've also discovered what appear to be concealed factory wiring connections behind the cabinetry, but they are not accessible without disassembly.

I'm hoping to learn from other owners

  1. Has anyone experienced similar symptoms, especially charging that fails during the hottest part of the day and later recovers?
  2. Has anyone had the factory roof panels replaced under warranty? If so:
    • What was the actual failure?
    • How did nuCamp diagnose it?
    • Was it the panel itself, wiring, junction box, connector, or something else?
  3. Can anyone confirm where the factory roof panel wiring is connected on a 2024 TAB 400?
    • Behind the radio?
    • MC4 connectors?
    • WAGO connectors?
    • Another hidden junction?
  4. Has anyone removed the interior panels and taken photos of the factory solar wiring? Those would be incredibly helpful.
  5. If you have the same system, what PV voltages do you normally see on your Victron controller during a sunny day?

I'm communicating with nuCamp and they've been trying to help throughout this process and I'm trying to determine whether this is an isolated issue or something that other owners have already solved. If I get to the bottom of this with nuCamp, I'll gladly post the solution here so future owners can benefit.

Thanks very much!

Gord

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