Horizon Power(1)




  • Class 1—System size of up to 5 kW
  • Class 2—System size of 5 kW to 50 kW
  • Class 3—System size of 50 kW to 1 MW
Horizon Power(2)
  • System type—Type of energy system used in embedded generation
  • Inverter make and model—Make and model of inverter is required, inverter must also comply with the Sunspec parameters listed in Appendix B.
  • Inverter (system) capacity—The single or three phase capacity of the inverter used is required
Horizon Power(3)
  • Energy Storage offers—General Management
  • Nominal rampdown rates—Time taken for the inverter to ramp down from nominal rated output to 0 kW
  • Non-linearity—Non-linearity of the ramp rate must be less than 10%
  • Energy Storage size—Size of the storage system for energy output is required

  • Inverter Demand Response Modes (DRM)—DRM required by Horizon Power says DRM 0 must be disconnected
  • Power Quality Response Modes—Horizon Power requires Volt – Watt Response mode to be enabled, voltages required as follows for one phase or three phase systems:
    • V1 = 190 V or 329 V
    • V2 = 220 V or 381 V
    • V3 = 254 V or 440 V
    • V4 = 265 V or 459 V
  • Volt – VAR Response Mode—Horizon Power requires Volt – VVAR Response mode to be disabled
  • Passive Anti Islanding Setting—Horizon Power requires fmin to be 46.5 Hz, fmax to be 53 Hz, and Vmin to be 190 V for one phase and 329 V for three phase systems

All of the Horizon Power inverter settings can be found in the technical requirements guide in Table 16 or Table 15 for Passive Anti-islanding settings.


  • Push button self test—A pushbutton is pressed to initiate a test sequence that results in PASS or FAIL
    • Action required—FAIL causes automatic disconnection of inverter and doesn’t allow permanent connection of RESI to HP Grid, PASS allows permanent connection of RESI to HP Grid
  • Automatic self test and push button self test—An automatic self-test is implemented along with the manual test, the automatic test would occur at given intervals of time


Explanations of schedules

  • Schedule 1—Checklist comprising key elements needed to be satisfied
  • Schedule 2—Conceptual diagram illustrating functional relationships between key subsystems
  • Schedule 3—One or more diagrams detailing electrical connections through point of connection to source
  • Schedule 4—Data associated with power cabled connecting inverter to HP’s electricity distribution system
  • Schedule 5—For Class 1 and 2 installations that require Generation Management and all Class 3 installations, NPER accredited engineer must validate designs

Examples of required materials for Schedules 2 through 5.

Feel free to contact us with any additional questions regarding your connection application.