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Zero Export Control By SMA Solar

Zero Risk with Zero Export

About this Document

For commercial PV systems, there are often more processes involved with the design and assessment of a site compared to smaller residential systems. In addition to these complexities, there may also be utility requirements that can involve extensive grid studies, which can add components, complexity and cost to a system, but also greatly extend a project’s time for connection approval.

Installing active power control to restrict export to the grid by a commercial PV system will lower the risks to a project. Non-exporting commercial PV systems reduce a utility’s risk associated with issues such as: Fault current contribution & protection, Voltage rise, Reverse Power Flow Calculations, Substation/Transformer loading, and potentially Neutral Voltage Displacement (NVD). The utility approval process is simplified and expedited with potentially lowered costs through avoided grid studies and additional system requirements.

Zero export control can allow for:

  • - larger PV systems to be installed
  • - simplified design where oversizing becomes more cost effective
  • - potentially avoid extensive grid studies and NVD
  • - standardized commercial PV system offering
  • - reduction in application processing time

non-exporting PV system

Figure 1: An example of a non-exporting PV system with the Cluster Controller and SMA Energy Meter.

Additional Resources:

- Tech Tip: How to Setup Zero Export with the Sunny Home Manager [Video]

Link: https://www.youtube.com/watch?v=bUKtDA5kM0g

- Tech Tip: How to Setup Zero Export with the SMA Cluster Controller [Video]

Link: https://www.youtube.com/watch?v=9IXJPPgxokM

- Tech Tip: Limited Export and Reactive Power Control [Video]

Link: https://www.youtube.com/watch?v=FNVysumiGeI

Zero Export Solutions:

System Size Products Required Accessories Requirements Utilities Comments Storage
1.5 … 7.5kW SB 1.5/2.5 SMA E-Meter • IGMP protocol from Version 2 must be supported by network devices. • SMA E-meter requires a Class 1 5A secondary current transformer for currents above 63A Currently not approved   • SI may be added and will require
• Proxy servers are not supported SHM where active power control is
• Wired communication between inverter limited to minimum 10% nominal
and E-meter recommended power of PV system. Ref: SMA Flexible
• Up to three devices can be connected Storage System.
to one SMA Energy meter for zero export • SBS may be added where zero
control. All inverters will behave the same export control is native to the inverter.
  • Zero export is possible with new
  SHM firmware available late 2016.
   
SHM + E-Meter   NT (officially approved by Power & Water)   • SI may be added and will require
  QLD (unofficially approved by Ergon; Energex)  
    SHM where active power control is
  NSW (unofficially approved by all)  
    limited to minimum 10% nominal
  SA (unofficially approved SA Power Networks)  
    power of PV system. Ref: SMA Flexible
  VIC (officially approved by Citipower; Powercor)  
• Permanent & stable internet connection   Storage System.
WA (unofficially approved by Western Power)  
• Registration to SMA Sunny Portal   • SBS may be added where zero
WA (unofficially approved by Horizon)  
• SHM supports up to 12 inverters   export control is native to the inverter.
   
SHM + D0-Interface at external meter • UDP port >1024 needs to be open     • Zero export is possible with new
• SIP/STUN/IGMP protocol from Version 2 Currently not approved   SHM firmware available late 2016.
• Proxy servers are not supported
must be supported by network devices    
  • Wired communication recommended  
      • No port forwarding at NAT NT (officially approved by Power & Water)  
      between Home Manager and SMA E-  
      • No packet manipulation/filtering of SIP QLD (unofficially approved by Ergon; Energex)  
      meter • SI may be added and will require
      packets at router NSW (unofficially approved by all)
    SHM + E-Meter   SHM where active power control is
    • SMA E-meter requires a Class 1 5A SA (unofficially approved SA Power Networks)  
  SB 1.5/2.5     limited to minimum 10% nominal
    secondary current transformer for currents VIC (officially approved by Citipower; Powercor)  
  SB 3/4/5TL-21     power of PV system. Ref: SMA Flexible
    above 63A WA (unofficially approved by Western Power)  
3 … 30kW STP 5...12TL-20     Storage System.
       
  STP 15TL-10         • SBS may be added where zero
  STP 20/25TL-30 SHM + D0-Interface at       export control is native to the inverter.
      Currently not approved   • Zero export is possible with new
    external meter    
          SHM firmware available late 2016.
           
             
        NT (officially approved by Power & Water)    
      • CLCON supports up to 75 inverters QLD (unofficially approved by Ergon; Energex)    
    • CLCON + E-Meter • CLCON-S supports up to 25 inverters NSW (unofficially approved by all)    
  SB 3/4/5TL-21 • SMA E-meter requires a Class 1 5A SA (unofficially approved SA Power Networks) • More advanced Monitoring (SCADA SI may be added. However, CLCON
  • CLCON-S + E-Meter
  STP 5...12TL-20 secondary current transformer for currents VIC (officially approved by Citipower; Powercor) support) currently only supports monitoring of
30 … 500kW  
STP 15TL-10   above 63A WA (unofficially approved by Western Power) • No internet required for zero export SI, and cannot provide active power
   
  STP 20/25TL-30       • Supports proxy servers feed-in control.
             
    • CLCON + external PLC External Modbus, Digital or Analogue Signals Check with local utility for approval    
    • CLCON-S + external PLC    
           
             
Abbreviations: CLCON = Cluster Controller; SB = Sunny Boy; STP = Sunny Tripower; SI = Sunny Island; SBS = Sunny Boy Storage; SHM = Sunny Home Manager; E-meter = SMA Energy Meter  

For reference only - Version 1.1 from SMA Australia Pty Ltd