One out of three ain’t bad??🙄

[Skypower]

My friend is an accomplished electrician/solar contractor. He was asked to look over a system that wasn’t living up to expectations so he went out to location on a sunny day and found a few things. The system has three Sol-Ark 15ks that seemed to have a wire color conflict, bad MC4 connectors and possible bad optimizers….so far.
The polarity is actually correct to the terminal but doesn’t match the wire color. What he’s going to check next is if there’s any actual damage to the MPP’s in each inverter in case they did multiple guesses. The original installer ghosted the homeowner after he got paid. The system was installed to code and passed inspection but lacking pride.
Vote for the correct picture, one, two or three:

 

[DIYrich]

For DC power, red is positive, and black is negative.

If "polarity is correct", then the wires should have the correct color tape at each end to indicate the proper color of the wire.

 

[Skypower]

For DC power, red is positive, and black is negative.

If "polarity is correct", then the wires should have the correct color tape at each end to indicate the proper color of the wire.

Exactly. What I’m thinking is that the original installer probably got confused with the the male female concept of the MC-4 connectors, didn’t bring enough to make it right, said screw it screw it and used it. What about the next guy, if an inverter needs to be pulled for a reason. It also would have been nice if the pairs were identified. But that’s just me? Yeah I m pretty sure it’s about to be corrected