whazzat?

[wyreman]

So I have occasion to monitor a good size solar array. Its pretty new and I confess, I had some training, but I don't know all that much about it.
Tomrw I will have a "ride along" and get to ask some questions. As they say, "there are no stupid questions, but there are... xxx ..." you fill in the blanks.

Any good prompts where to steer the conversation?
Some things that come to mind

any maintenance?
I see that there are some filters that get plugged up and could be cleaned out on the inverter cabinets.
heat scan / IR
The actual arrays could be washed down after the rainy season I guess, or at the height of the summer.
I can monitor the output and investigate if it changes in a big way over time.

Do you have to tighten up any connections in the field where they orignate, before the get to the combiner?

 

[Zee]

measure the strings with a good DC ammeter. Just compare one to the others.
Let the rain handle the washing.
Clean filters.
Consider "floating" the array beforehand, if working near panels and wiring.

 

[wyreman]

We just went thru it today and one of the best advice seem to be to install a prefillter

Just tape a section of FAU filter to the intake.

I never realized how smart a dgmi had to be. Power factor, wave form meshing

And disconnect the bigger $ first- it's likely the dc side


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[wyreman]

I do really like your idea of comparing the strings. We have some big combiner boxes though with some torn insulation. I like the idea of measuring the little strings better!

I had lots of ac arc flash Trainings but no one ever said anything about dc just the old

Ac knocks you off
Dc you get clamped on


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[wyreman]

500v dc buss


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