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Old 01-19-2016, 10:09 AM   #1
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Default PV rapid shutdown device location

Hello,

I understand based on the local jurisdiction, the location of PV rapid shutdown device could be on the interior of the building or on the exterior. I would appreciate some comments on following scenario:
We're planning to install a 8 kW grid-tied PV system on a roof top of two-storey multi-unit residential building. The electrical utility meter and distribution equipment are installed inside the building in the main electrical room. We would install a PV system shutdown device on the rooftop which would activate upon loss of utility AC power and as I understand by code, another PV system shutdown device grouped with the one on the rooftop is required before the DC/AC inverter.

My query is that knowing all electrical equipment is installed inside the building, would the PV system shutdown device installed before the inverter be located inside the building or outside the building as per standard industry practice. In the end the local authority would dictate the terms, but I wanted to understand the industry practice for such scenario.

Thank you.
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Old 01-19-2016, 02:37 PM   #2
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As a former firefighter, I would prefer to see the PV shutdown in the same location as the service disconnect.
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Old 01-21-2016, 09:11 AM   #3
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thank you for the response. If the main service disconnect is located inside the building in the main electrical room along with the meter, then I suppose the shutdown device would be located inside the electrical room, unless the AHJ requires otherwise.
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Old 01-21-2016, 10:50 AM   #4
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Location is best with the service disco. One stop shopping for the FFs. Rapid Shut Down systems must be listed. That means to me, you can't build your own shunt trip equipment. I'm not sure about the shutdown with power failure. I see where if the service is killed the wiring from the panels would be off, but all the systems I see are manual reset. That would not work if every time the power went out, you had to reset the RSD system.
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Old 01-22-2016, 05:16 AM   #5
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Backstay, is there a model/make you'd recommend....? ~CS~
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Old 01-22-2016, 01:50 PM   #6
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An option you could use is Micro inverters. I little more expensive but would take care of the rapid shut down. Just a possibility I believe.
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Old 01-22-2016, 03:01 PM   #7
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Thank you very much for the responses.

Microinverter seems like a good alternative. It would not work if AC power is not available (power outage) and an AC disconnect could be installed prior to the main panel for disconnection.
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Old 01-22-2016, 09:57 PM   #8
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Quote:
Originally Posted by chicken steve View Post
Backstay, is there a model/make you'd recommend....? ~CS~
I've only used Midnite Solar's Bird House.
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Old 02-26-2016, 10:50 AM   #9
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Another option is Solar Edge The string voltage is managed by the inverter and goes to 1V per opto in a grid failure and auto resets.
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