Installing SMA’s Rapid Shutdown System: Tech Tip Video

From on 01/20/2017 in Category Tech tips with 46 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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46 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 »
  • avatar

    Shawn Horstman

    04/04/2019 at 3:12 pm

    I have installed multiple rapid boxes and it seems like a hit and miss with them working properly. When I connect more then one rapid box is there a specific way the wiring from the button to the other boxes must be done?

    Reply »
    • avatar

      Mike

      04/05/2019 at 10:46 am

      Shawn – In line with the instructions in the installation manual in Section 6.4:
      “Procedure:
      If several Rapid Shutdown Boxes are present in your Rapid Shutdown System, connect the first Rapid Shutdown Box to the Rapid Shutdown Controller first. To do so, first connect one end of the
      conductors to the Rapid Shutdown Box and then connect the other end of the conductors to the Rapid Shutdown Controller”.

      There is no specific order of the top and bottom terminals, just ensure that the jumper between pins 3 and 4 is installed on the last box. Also, channel A (the inputs closest to the mounting bracket) must be used in each box.

      Reply »
  • avatar

    shane

    05/15/2019 at 2:38 pm

    how come the RSB does not have 3 channels to match the 3 mmpts in the inverters?

    Reply »
    • avatar

      Mike

      05/16/2019 at 2:37 pm

      Shane – the RSB was developed with our prior generation Sunny Boy line that had two MPP trackers. Our Power+ solution can satisfy all the requirements of the 2017 NEC (which the RSS cannot) and so that is the recommended solution for the current Sunny Boy line. Please note that the parallel mode of the current Sunny Boy can accommodate three strings from one RSB if the stringing and array location/spacing allows it, for areas not on NEC 2017.

      Reply »
  • avatar

    John Holmes

    06/06/2019 at 7:55 am

    I am looking at 2 ways of configuring a system please read below.

    With 2 out puts on the SMA rapid shut down. 3 in puts on the 5.0-US inverter.
    18 panels 300 w 40Volts 9 amps each
    Set in 2 strings of 9 panels into the rapid shut down.
    Each panel would need to reach 10volts for power production.
    Inverter usable input voltage 90v
    Rapid shut down into to A and B MPP inputs leaving C not used.
    Issue is clipping
    How to utilized C MPP for full capacity of the inverter with 2 strings?
    To my understanding A, B, C MPP do not go into a common buss.

    Another way of doing this is 3 strings of 6 panels
    Second rapid shut down box ? for C channel
    Inverter usable input voltage 90V.
    There for each panel would need to reach 15 volts for power production.

    I would appreciate any feed back on the above.
    If I am not clear on something please let me know.
    I am referencing page 65 in the manual for the 5.0-US inverter.

    Thank you

    Reply »
    • avatar

      Mike

      06/11/2019 at 8:43 am

      John, I think the two strings of 9 modules would be the better solution. The inverter runs more efficiently at higher voltage, and each input begins to make power when the voltage hits 125VDC, and can then work down to 100V. The Rapid Shutdown Box turns on at 110V. Where is your array located? I am not sure I understand the clipping comment. At 5400 STC watts, do you expect to achieve more than 5000W regularly? You will need to be over 5100W on the DC side to have the inverter output be the limit.

      Reply »
      • avatar

        John Holmes

        06/11/2019 at 9:54 pm

        Hi Mike
        Thank you for the reply
        The invert SMA 5.0-US has 3 inputs A,B,C
        If only using 2 inputs then would we only be using 2/3 of the capacity of the inverter?
        To my understanding the inputs are not to a common DC bus is there a common point internal?
        I work on Frequency drives on a regular basics same ideas of inverters.

        My location is in Calgary Alberta lots of sun may over produce on a sunny winter day.
        South facing.
        It would be interesting to put a scope on the system to see what happen on certain days.
        I will go with the panels 9 in each string.

        John Holmes

      • avatar

        Mike

        06/13/2019 at 8:11 am

        John – as long as you do not exceed 600V DC or 18A Isc on any input, the inverter will draw power at up to 10A per input. Each input has its own MPP tracker, but all DC power is converted in sum up to the AC limit of the inverter. So it is completely possible to bring in enough DC watts into 2 channels (slightly more than 2500 STC W each) to gather full AC output from the 5 kW inverter.

  • avatar

    Sam

    07/08/2019 at 8:40 am

    The system is completely installed, but the green safe light on the rapid shutdown switch isn’t coming on. We checked voltage before and after with a volt meter and the rapid shutdown system is working. It’s just the green light isn’t working. We even flipped the wire feeding red light with the green light wire and the green light turns on but the red didn’t. We checked continuity of the wire and it’s good. We also changed out the connector for the control wire and same issue. So, the green LED works and the device shuts down the system, but green light doesn’t shine. Tells me something is wrong in the SMA rapid shutdown box.

    Thoughts?

    Reply »
    • avatar

      Mike

      07/12/2019 at 9:57 am

      Sam – is the jumper installed between pins 3 and 4 on the other control wire plug in the Rapid Shutdown Box as shown on page 24 (step 13) of the Installation Manual (Version 1.5 here (https://files.sma.de/dl/27991/RSS-US-IA-xx-15.pdf))? If so, you should call service at 1-877-697-6283.

      Reply »
  • avatar

    Ken

    07/11/2019 at 12:41 pm

    So can I infer, since they’re not listed, that the RSB is not compatible with older SMA Sunny Boy inverters like the SB 6000US-10?

    Reply »
    • avatar

      Mike

      07/15/2019 at 8:50 am

      Ken, that is correct, the RSS was not tested with the older inverters. The -10 models do not have AFCI protection which is likely also required.

      Reply »
  • avatar

    Scrump

    07/18/2019 at 12:27 pm

    Hello,
    Regarding the Rapid Shutdown Box…my company has replaced a bunch on RMA, and it seems one now has failed in the opposite way most others have failed. The ones that we replaced would not turn ON in the morning (no DC power output from the RSB), bad relay or solenoid…
    Now it seems there is one that won’t trigger OFF when the RS Controller is engaged (Red Button pushed).
    What’s happening inside the RSB? I assume the same relay or solenoid that has previously failed in the OFF position has now failed in the on (continuous voltage to the RSB out) when there is ambient light.
    Is this a hazard/must the system be turned off immediately or can we wait for the replacement device? In other words, the relay that turns on at 32 volts in the morning to activate the system is already in the on position (it must be) if the RSB is outputting voltage. Please advise.
    Regards,
    mark

    Reply »
    • avatar

      Mike

      07/29/2019 at 9:07 am

      Mark – if the RSB is not separating the array from the inverter, there is no Rapid Shutdown function. If this is required by code, the system should not be put into operation.

      Please, contact our Service Support team:

      MA Service Line
      +1 877-MY-SMATech (+1 877-697-6283)
      (toll free for USA, Canada and Puerto Rico)

      Residential and Commercial Service:
      Service@SMA-America.com

      Reply »
  • avatar

    Robert

    07/21/2019 at 4:17 pm

    I have connected up the arrays and my red light is coming on and not going off, The only thing I can come up with is that we wired the 1-5 pins backwards. Also I have 3650 watts per channel. 1 channel is saying 480 VDC and the other is saying 48

    Reply »
    • avatar

      Mike

      07/29/2019 at 9:10 am

      Robert – please also ensure that you have installed the jumper between pins 3 and 4 on the other five pin plug.
      Please, contact our Service Support team:
      SMA Service Line
      +1 877-MY-SMATech (+1 877-697-6283)
      (toll free for USA, Canada and Puerto Rico)
      Residential and Commercial Service:
      Service@SMA-America.com

      Reply »
  • avatar

    Antonio

    09/11/2019 at 2:32 pm

    So i have 1 string going in to RSB side A input and one string going in Side B input, both strings have 10 panels. on my out put i have have side A output going to inverter A and B output going to inverter B. have low voltage wire 5 on bottom port with bypass on top port from 3 to 4. my issue is that i cant get power past the RSB, tested all my wire, contacter in Control box and all my feeds. any suggestions? my strings have 350 V going into RSB

    Reply »
    • avatar

      Mike

      09/12/2019 at 2:23 pm

      Antonio, connecting the output of one RSB to two inverters is not allowed. Please see bottom of page 17 of the Install Manual (https://files.sma.de/dl/27991/RSS-US-IA-xx-15.pdf): “Always connect the output strings of the Rapid Shutdown Box to the same inverter. The output strings must not be connected to various inverters”

      Reply »
  • avatar

    brian

    09/19/2019 at 9:00 am

    Is it possible to run the control box wire in the same EMT conduit as the DC wires back to the inverter without any interference issues? Should I use shielded cable?

    Reply »
    • avatar

      Mike

      09/19/2019 at 10:51 am

      Brian, it is not required to use shielded cable. If run in the same conduit as the DC conductors, ensure the insulation of the control cable is rated to 600VDC. Other requirements are on page 21 of the Installation Manual (https://files.sma.de/dl/27991/RSS-US-IA-xx-15.pdf).

      Reply »
  • avatar

    everth

    12/27/2019 at 11:29 am

    I am looking for SMA Rapid shut down box and controller can you let me know if you guys have it please thank you

    Reply »
    • avatar

      Alexandra

      01/08/2020 at 9:35 am

      Hi Everth! Thanks for reaching out! Please contact us via Sales@SMA-America.com Our team will be happy to assist you.

      Reply »
  • avatar

    everth galdamez

    01/09/2020 at 8:15 am

    how can I get rapid shutdown box and controller also ups with as well can you let me know please thank you

    Reply »
    • avatar

      Alexandra

      01/09/2020 at 1:57 pm

      Hi Everth! Thanks for reaching out! Please contact us via Sales@SMA-America.com Our team will be happy to assist you.

      Reply »
  • avatar

    Shaun Miller

    02/06/2020 at 11:40 am

    In Alberta, Canada, PV rapid shutdown systems or equipment now must be certified to CSA C22.2 No. 330-17. Does this product have that rating?

    The RSD initiator must have C22.2 No. 330. Does the initiator have this rating?

    Also inverters must have CSA 22.2 No. 107.1-16, is this the case for the SB3.0-7.7-US-40?

    Reply »
    • avatar

      Mike

      02/28/2020 at 10:07 am

      Shaun – SMA stopped manufacturing the Rapid Shutdown system last year as 2017 NEC code requires MLPE to satisfy 690.12 B (2). For the Sunny Boy question, product management provided this reply: “CSA 22.2 107.1-16 supercedes the CSA C22.2 107.1-01 Standard for power conversion equipment. However, power conversion equipment manufactured and certified to CSA C22.2 107.1-01 will continue to be listed until January 1, 2022.”

      Reply »
  • avatar

    Allen

    02/19/2020 at 5:56 pm

    I’m interested in this product. Do you have a local agent in Taiwan?

    Reply »
  • avatar

    Mike

    06/27/2020 at 1:29 pm

    HI,

    I see the RSB-2S-US-10 is certified with SBx.x-1SP-US-40 under NEC2014, but is it certified for use with SBx.x-1SP-US-41?

    Thanks,

    Reply »
    • avatar

      Mike

      09/10/2020 at 8:02 pm

      Mike, yes this will work with the -41. You should choose “Off” for Rapid Shutdown method during commissioning of the inverter, as the RSS is DC powered and will not trigger Rapid Shutdown with loss of AC power.

      Reply »
  • avatar

    Javier Alvarez

    07/21/2020 at 1:25 pm

    Hello.

    Some person told me that SMA is not commercializing this product anymore, is that true? Is there any agent serving Central America? Or United States?

    Regards,

    Javier Alvarez

    Reply »
    • avatar

      Mike

      08/27/2020 at 5:21 pm

      : Javier – the SMA Rapid Shutdown System is no longer being produced. SMA’s TS4-R-F units along with the US-41 models of Sunny Boy and Sunny Tripower allow fast easy compliance to 2017 and 2020 NEC rapid shutdown requirements, which the Rapid Shutdown System did not. When you refer to agent, do you mean a sales or a service person? Our equipment is sold through our Authorized Distributor network – more information on our ADs is here.

      Reply »
  • avatar

    Alex

    08/19/2020 at 2:01 pm

    If we use this rapid shutdown box, can we also use the Secure Power Supply option? I saw that Secure Power supply does not work with Sunspec rapid shut down, and the Tigo rapid shutdown.

    Reply »
    • avatar

      Mike

      08/27/2020 at 5:07 pm

      SMA’s rapid shutdown system was DC powered and did allow the use of the Secure Power Supply. That rapid shutdown system satisfied 2014 NEC rapid shutdown requirements, but not 2017 or 2020, so it was discontinued.

      Reply »

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