Each controller is fed by two 250W and one 300W panels. All wired in parallel.
Today I noticed for the first time that one controller was pulling 5W and the other 450. I reset the 5W controller by killing the solar input and then disconnecting it from the battery bank and it came back on at 0W.
I then went into the working controller and it gave me a #66 communication warning, meaning it’s trying to charge in parallel with another controller that has different charge settings. I checked all settings and everything matched exactly. Then I noticed they were all setup on VE smart Networking which I never setup before.
I removed both controllers from VE smart network, reset both, and now the #66 warning is gone but I still am showing 0W input to that one controller. What should I check next?
Check the connection of the first MPPT towards the battery. Its battery voltage is much higher than the other two, so likely theres a loose conenction or a blown fuse
As for the VE.Smart networking, thats not an automatic feature. Someone has to deliberately set up one. If it wasnt you, then it was someone else. Change device passwords if in doubt.
Melted insulation like that is usually caused by the clamping screw being too loose. Once it is loose it has a high resistance and causes heat, which relaxes the terminal, which increases the resistance creating more heat, death spiral. Soon after commissioning and routinely on vehicles and boats all terminals need checking for tightness.
btw, this is typically not a warranty issue, this is down to the install and maintenance.
What kind of wire is that? I can’t see the stranding, but the PV side wire looks a lot like one of the big no-nos, and as called out in the Safety section of the manual: 1. Safety precautions
