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Discussion Starter · #1 ·
I work for a commercial electrical contractor and we don't do much with solar. We were brought into a building to disconnect some panels so roofers could get in and the guy who reconnected them ****ed up. He didn't disconnect the DC link and said he saw an arc at the MC4 connector when he did. He also briefly hooked up two stings incorrectly so that one had 6 panels and the other had 8 (each was supposed to have 7). It was like this for several hours..

My question is: how much damage could have ben caused?
 

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Damage to what? The inverter, the panels, wiring? Did you remove the panels so the roofers could do their thing, and "the guy" put everything back? Who does "the guy" work for? Was he qualified to reconnect them? does he still have a job?
 

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Discussion Starter · #3 ·
Damage to what? The inverter, the panels, wiring? Did you remove the panels so the roofers could do their thing, and "the guy" put everything back? Who does "the guy" work for? Was he qualified to reconnect them? does he still have a job?
Anything. He removed them, reattached them and then I came a few hours later and put them back in the proper strings. He works for the same company I do, and yes where I live he is qualified but he doesn't have much experience.

INB4: I work for a sketchy company, I live in a sketchy place, he should be fired. Just wondering if you know the likelihood of damage. If not thats okay.
 

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Anything. He removed them, reattached them and then I came a few hours later and put them back in the proper strings. He works for the same company I do, and yes where I live he is qualified but he doesn't have much experience.

INB4: I work for a sketchy company, I live in a sketchy place, he should be fired. Just wondering if you know the likelihood of damage. If not thats okay.
Nice and friendly company.

Probably no damaged. That's the fun with electronics you never really know until the magic smoke comes out.

If the guy didn't try to cover up what he did then its a ops. In-experienced people make op'es and experienced people normally take the time to show/teach the person so it doesn't happen again.
 

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It's unlikely you had the brightest design day going on at the time, so the string with the extra panel was probably no big deal. If the inverter(s) appeared to fire up normally, chances are you're just fine. I might be mildly concerned about potential crisping of the MC4 interlink, but there's plenty of people that pop them in and out hot with no particular issues.
 

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Anything. He removed them, reattached them and then I came a few hours later and put them back in the proper strings. He works for the same company I do, and yes where I live he is qualified but he doesn't have much experience.

INB4: I work for a sketchy company, I live in a sketchy place, he should be fired. Just wondering if you know the likelihood of damage. If not thats okay.
Most commercial PV systems are pretty stout. Check the fuses in the combiner box, but other than that, just check your outputs, and unless there's obvious damage (like chipped/cracked panels) you should be good to go.
 

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The biggest problem is you probably damaged the sun quite a bit. We are all bummed. I't a very delicate device. You should put dark tarps over panels prior to disconnecting them.



 

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Unlikely that you did any serious damage

panel numbers would not have done any damage
as the switch mode controller would have compensated
And interupting any dc circuit under load will draw an arc
but I think you will find this stuff is designed for it
rest easy !
 
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