We do mostly residential around my parts but our recent job is on a small commercial building with tilted arrays spaced about 24 feet apart N-S. There are either 4 or 7 sub-arrays depending how you look at it (there is a small corridor down the middle for walking, but thats a little beside the point).
We are using a Fronius string inverter with a rapid shutdown box. But I am wondering if every sub array needs to be compliant with the rapid shutdown rule?
The way it is designed right now, if RS is initiated, there will still be DC power present in the EMT between subarrays located on the roof.
Since we don't do many commercial roofs I don't come across this much.
Do we need a controller at every sub array? If so, I guess that is a major case for going with Solaredge or AC modules in the future.
thanks
We are using a Fronius string inverter with a rapid shutdown box. But I am wondering if every sub array needs to be compliant with the rapid shutdown rule?
The way it is designed right now, if RS is initiated, there will still be DC power present in the EMT between subarrays located on the roof.
Since we don't do many commercial roofs I don't come across this much.
Do we need a controller at every sub array? If so, I guess that is a major case for going with Solaredge or AC modules in the future.
thanks