Installing SMA’s Rapid Shutdown System: Tech Tip Video

From on 01/20/2017 in Category Tech tips with 12 Comments
RSD_Box_160412

Check out our latest Tech Tip to learn how to properly install SMA’s Rapid Shutdown System.

Why choose SMA’s Rapid Shutdown System? First of all, it’s the most cost-effective way to comply with 2014 NEC 690.12 for states that have adopted 2014 NEC or will be adopting it soon. It will also ensure compliance in those states that have adopted 2017 NEC, until the 2019 80-volt limit goes into effect.

Another major reason to select SMA’s Rapid Shutdown System is that it is compatible with our Secure Power Supply functionality for residential string inverters in case of grid outages – whereas other rapid shutdown systems would eliminate such functionality.

Finally, our Rapid Shutdown System is fast to install. It also fits underneath a module, so you won’t need to extend racking to accommodate it.

Watch the video to learn more!

 

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Jessica Dumont is a public relations specialist for SMA America. She is focused on news, industry trends and what's happening at SMA.

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12 Comments

  • avatar

    Mike McNamara, P.E.

    04/08/2017 at 12:12 pm

    I have a large 19.8kW residential system being designed. Given the size, most of three roof orientations (south, east & west) will be covered with panels. Finally, we are utilizing three SB70-1SP-US-40 inverters with a total of 9 strings (3 strings per inverter). Each roof orientation has a string going to one of the three inverters. Given the layout I don’t want to have to purchase 9 RSBs and only be able to use one channel per RSB. I am hoping I can purchase 5 RSBs utilizing both A & B channels on 4 of them and just the A channel on the 5th one. However, this will require that I be able to run a string going to Inverter #1 and a string going to Inverter #2 through a single RSB. So here is my question… Are the A & B channels sufficiently independent that I can hook up a string going one inverter and a string going to a different inverter through a single RSB?

    Reply »
    • avatar

      Mike

      06/02/2017 at 10:05 am

      Unfortunately, each output channel (A or B) of one Rapid Shutdown Box (RSB) must go into its own MPPT channel of the same inverter. The output channels of two boxes can go to the same inverter, but each channel must go to its own MPPT input on the inverter. Are the sub arrays close enough to allow one box to handle both the east/south or south/west orientations for an inverter?

      Reply »
  • avatar

    Julian

    07/13/2017 at 10:39 am

    The channel B always problem not working only channel A why string has power and inside the rapid shut down has power but not in the output connection for inverter

    Reply »
    • avatar

      Mike

      08/18/2017 at 10:21 am

      Hello Julian, each output channel from one Rapid Shutdown Box must go to its own MPPT channel of the same inverter. We recommend connecting with our service line at 1-877-697-6283 or Service@SMA-America.com.

      Reply »
  • avatar

    Uttam Chauhan

    01/07/2018 at 6:50 pm

    Hello SMA team,

    I think installation manual of Rapid Shutdown shows wiring to the controller is wrong (please correct me if I am reading it wrong). On page 25 – fig 9 – It shows red wire (pin no 1) from rapid shutdown box going to (o) – common wires of both LED’s (Red and Green). However it should goes to one side of rapid shutdown on/off switch (+12V_ – X2).
    No. 3 wire from Rapid Shutdown Box which is (o) should go to common wire (jumper wire of both LED’s) of both led (red and green).

    I am comparing wiring pin diagram on page 23 fig 8 which shows 1-5 connections pins inside rapid shutdown box.

    The visual picture is confusing me as if I go pin by then then its not the same – Please correct. Also, why the visual in installation manual is so foggy that its hard to make out?

    Thanks!

    Uttam

    Manual I am reading from
    sma.de/dl/27991/RSS-US-IA-xx-14.pdf

    Reply »
    • avatar

      Mike

      01/08/2018 at 3:32 pm

      Hello Uttam, the pin assignments shown below Fig. 8 and Fig. 9 appear consistent to me. Which pin assignment do you think is not consistent? And which visual is appearing unclear?

      Reply »
  • avatar

    jeff unabia

    04/12/2018 at 9:56 am

    Hi,
    Is the Rapid shutdown system can also be used for commercial scale PV system, 100-1M Wp solar PV rooftop installation using SMA STP60 or SMA STP25000TL

    Reply »
  • avatar

    Daniel Fracalossi

    09/22/2018 at 12:29 pm

    I have one rapid shutdwon and your manual is confusing. What awg size jumper do I use between terminal 3 and 4 of the second five-pole plug. It says to use a jumper rated for the maximum system voltage? I have only two strings of 10 and 11 panels. Can the jumper be the same 18 awg as the conductors going into the bottom plug? What is the maximun size AWG that the plug will take. Why does everything have to be so confusing.
    Also, on page 23 of the manual, am I to assume that pin 5 is the top pin on the side of the rapid shutdown mounting bracket, as shown?

    Reply »
    • avatar

      Mike

      09/26/2018 at 4:26 pm

      Daniel, apologies for any confusion in the manual. The conductors for the control plug can be 16 or 18 AWG. Yes, pin 5 is the one closest to the rail mounting bracket.

      Reply »
  • avatar

    Gabriel Digiacomo

    10/18/2018 at 5:38 pm

    Hi I just wired two Rapid shutdown boxes with the wires from the button to box A, lower pin terminals. Then from box A’s upper 5 terminals, I went to box B’s lower terminals. Then in box B, I jumper the upper 3&4 terminals. Is this correct?

    In the manual it seemed to be telling me that box B would have jumper 3&4 in the lower terminals, but I already had the wires from box A there…

    Reply »
    • avatar

      Mike

      10/19/2018 at 9:30 am

      Hi Gabriel! It does not matter which port (upper or lower) that you use, just that the last box has the jumper installed. It sounds like you have wired it correctly.

      Reply »

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