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# Webinar Training 041609

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CCSE - CSI Workshop:
Micro-Inverter System Installation Recommendations

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### Webinar Training 041609

1. 1. Micro-Inverter System Installation Recommendations Jeff Laughy Applications Engineer
2. 2. Enphase Micro-Inverter One Micro-inverter per PV Module Enphase Energy Proprietary & Confidential [ 2 ]
3. 3. Photovoltaic Cell Building Block of PV Modules Each cell produces .5 Vdc Monocrystalline cell - a thin slice cut from a single crystal of Monocrystalline Cell silicon, highest efficiency 17% Polycrystalline cell – liquid silicon is poured into blocks, then sliced, more cost efficient, lower efficiency, 15% Polycrystalline Cell Enphase Energy Proprietary & Confidential [ 3 ]
4. 4. Typical Configurations 54 cells in series 60 cells in series 72 cells in series produce enough voltage to charge 24V batteries (24 volt nominal) 84 cells in series Enphase Energy Proprietary & Confidential [ 4 ]
5. 5. Maximum Power Point Short Circuit Current Isc 5.75 A Voltage varies with Open Circuit Voltage Voc 47.7 V Max Power Current Imp 5.25 A Temperature Max Power Voltage Vmp 40.0 V Current varies with Irradiance Power equals Voltage x Current 5.25 A x 40.0 V = 210 Watts Enphase Energy Proprietary & Confidential [ 5 ]
6. 6. Series String Current is equal in a series circuit, unshaded string would produce 5.25 amps x 40 volts = 210 watts per module, 5 modules at full power = 1050 watts per string. Enphase Energy Proprietary & Confidential [ 6 ]
7. 7. Series String Shaded Lowest performing module determines the current for the string, a single shaded module could reduce the current to 2 amps 2 amps x 40 volts = 80 watts per module, 5 modules at 80 watts = 400 watts per string, 38% of max. Enphase Energy Proprietary & Confidential [ 7 ]
8. 8. Micro-inverter Branch In the micro-inverter branch only one modules current reduced to 2 amps 1 module at 80 watts 4 modules at 210 watts = 840 watts Power produced per branch = 920 watts, 87% of max. Enphase Energy Proprietary & Confidential [ 8 ]
9. 9. Burst Mode BURSTING STORING BURSTING STORING BURSTING [9]
10. 10. Roof Top Array Temperatures Enphase Energy Proprietary & Confidential [ 10 ]
11. 11. Roof Top Array Temperatures Enphase Energy Proprietary & Confidential [ 11 ]
12. 12. Roof Top Array Temperatures Location Data AC Power output 124 Watts Ambient Air Temp (Ta) 113.56 °F Metal Roof Surface Temp (Troof) 147.42 °F Module Glass Temp (Tframe) 125.10 °F Under Module Air Temp (Tamb) 110.10 °F Micro-Inverter Internal Temp (Tinv) 120.07 °F Enphase Energy Proprietary & Confidential [ 12 ]
13. 13. Micro-inverter Technical Data 60 and 72 Cell Modules, 240 Vac  Input Data (DC) –  Recommended Input Power (STC) 230 Watts –  Peak Power Tracking Voltage 22V – 40V –  Maximum DC Voltage 54V –  Positive Ground  Output Data (AC) –  Maximum Output Power 190 Watts –  Nominal Output Current .80 Amps –  Maximum number of inverters per 15 amp branch circuit 15 Enphase Energy Proprietary & Confidential [ 13 ]
14. 14. Distribution Panel Connections 240 Vac Single Phase
15. 15. Voltage Drop Considerations, 240 Vac The table below provides recommendations for wire size from the junction box at the beginning of the Micro-inverter branch to the main load center based on distance. External Branch (Home Run) Wiring Maximum Distance in Feet Micro-Inverters per Branch Wire 7 8 9 10 11 12 13 14 15 14 AWG 126 103 84 68 54 42 31 21 12 12 AWG 199 163 133 107 86 66 49 33 19 10 AWG 318 260 212 171 137 106 78 53 30 8 AWG 507 414 337 273 218 169 125 84 48 6 AWG 804 656 535 433 345 267 198 135 76 Enphase Energy Proprietary & Confidential [ 15 ]
16. 16. Micro-inverter Technical Data, 60 and 72 Cell Modules, 208 Vac  Input Data (DC) –  Recommended Input Power (STC) 230 Watts –  Peak Power Tracking Voltage 22V – 40V –  Maximum Input Voltage 54V –  Positive Ground  Output Data (AC) –  Maximum Output Power 190 Watts –  Nominal Output Current .92 Amps –  Maximum number of inverters per 15 amp branch circuit 21 Enphase Energy Proprietary & Confidential [ 16 ]
17. 17. Distribution Panel Connections 208 Vac Three Phase Enphase Energy Proprietary & Confidential [ 17 ]
18. 18. Voltage Drop Considerations, 208 Vac The table below provides recommendations for wire size from the junction box at the beginning of the Micro-inverter branch to the main load center based on distance. The table is in increments of 3 inverters, always round up to the next increment. External Branch (Home Run) Wiring Maximum Distance in Feet Micro-Inverters per Branch Wire 6 9 12 15 18 21 14 AWG 479 303 209 148 104 69 12 AWG 759 481 332 235 165 109 10 AWG 1212 768 531 376 263 174 8 AWG 1932 1224 846 599 419 277 6 AWG 3061 1939 1340 950 664 438 Enphase Energy Proprietary & Confidential [ 18 ]
19. 19. Distribution Panel Connections 208 Vac Three Phase with LCF Enphase Energy Proprietary & Confidential [ 19 ]
20. 20. The Enphase Micro-Inverter System Site Installed Components Micro-Inverters One inverter per-module Communication Gateway Each gateway supports 250 inverters AC Interconnect Cable, End Cap One per 15 amp branch circuit Junction Box Adapter Plate One per 15 amp branch circuit Enphase Energy Proprietary & Confidential [ 20 ]
21. 21. Micro-Inverter System Enphase Energy Proprietary & Confidential [ 21 ]
22. 22. Micro-Inverter System Enphase Energy Proprietary & Confidential [ 22 ]
23. 23. Branch Circuit Cable Layout   Inverter branches can be routed horizontally, vertically, or a combination of both directions.   Standard Inverter cable lengths are 6 ft, extension cables are available in 6 ft, 12 ft and 20 ft lengths. Enphase Energy Proprietary & Confidential [ 23 ]
24. 24. Micro-Inverter System Enphase Energy Proprietary & Confidential [ 24 ]
25. 25. Micro-Inverter Installation Step 1 - Junction Box Adapter Plate Step 2 - Attaching the Micro-Inverter Step 3 - Connecting the Circuit Cables Step 4 - Grounding Conductor Connection Step 5 - Installation Map Step 6 - Module Connection Indicates a fact or feature very important for the safety of the user. Indicates an Enphase recommendation or best practice. Enphase Energy Proprietary & Confidential [ 25 ]
26. 26. Step Step Step Step Step Step 1 2 3 4 5 6 Junction Box Adapter Plate Mount an outdoor rated junction box to the adapter plate. This junction box is used to connect the inverter pigtail to the cable or conduit that has been run to the main load center. Enphase Energy Proprietary & Confidential [ 26 ]
27. 27. Step Step Step Step Step Step 1 2 3 4 5 6 Junction Box Adapter Plate Install the Enphase adapter plate and junction box assembly to the module racking. Enphase Energy Proprietary & Confidential [ 27 ]
28. 28. Step Step Step Step Step Step 1 2 3 4 5 6 Junction Box Adapter Plate Connect the Enphase AC interconnect cable to the junction box. Standard Inverter pigtail length is 6 ft, longer pigtails are available in 12 ft and 20 ft lengths. Enphase Energy Proprietary & Confidential [ 28 ]
29. 29. Step Step Step Step Step Step 1 2 3 4 5 6 Attaching the Micro-inverter Mark the approximate centers of each PV module on the racking system. (module width plus 1” for clips) Avoid aligning the Inverter with the Module junction box. Enphase Energy Proprietary & Confidential [ 29 ]
30. 30. Step Step Step Step Step Step 1 2 3 4 5 6 Attaching the Micro-inverter Attach the Enphase Micro-inverters at the module centers using the racking manufacturer’s hardware. Orient the inverter so that the inverter connector with male pins is toward the load center. Enphase Energy Proprietary & Confidential [ 30 ]
31. 31. Step Step Step Step Step Step 1 2 3 4 5 6 Connecting the Circuit Cables Connect the first Enphase Micro-inverter to the Enphase AC interconnect cable. Orient the inverter so the male connector is toward the junction box. Enphase Energy Proprietary & Confidential [ 31 ]
32. 32. Step Step Step Step Step Step 1 2 3 4 5 6 Connecting the Circuit Cables Connect the remaining Enphase Micro- Inverters. Ensure that the connectors are securely locked. Use cable ties to secure the AC cables to the racking. Enphase Energy Proprietary & Confidential [ 32 ]
33. 33. Step Step Step Step Step Step 1 2 3 4 5 6 Connecting the Circuit Cables Do not exceed the maximum number of Enphase Micro-inverters per branch circuit listed on the product label. Enphase Energy Proprietary & Confidential [ 33 ]
34. 34. Step Step Step Step Step Step 1 2 3 4 5 6 Connecting the Circuit Cables Attach the included protective end cap onto the unused connector of the last Enphase Micro- inverter. Enphase Energy Proprietary & Confidential [ 34 ]
35. 35. Step Step Step Step Step Step 1 2 3 4 5 6 Grounding the Conductor Connection Connect the grounding conductor to each Enphase Micro-inverter in the location marked “Grounding Electrode Terminal”. Enphase Energy Proprietary & Confidential [ 35 ]
36. 36. Step Step Step Step Step Step 1 2 3 4 5 6 Grounding Conductor Connection Route a single grounding conductor through all the inverters. Connect a short length of Ground wire to each module Separate conductors for the modules and inverters may be installed. Enphase Energy Proprietary & Confidential [ 36 ]
37. 37. Step Step Step Step Step Step 1 2 3 4 5 6 Installation Map Peel one of the two labels from each Enphase Micro- inverters and place the label on the Enphase installation map to show the relative physical location of the modules. Enphase Energy Proprietary & Confidential [ 37 ]
38. 38. Step Step Step Step Step Step 1 2 3 4 5 6 Module Connections Connect the PV modules to the Enphase Micro- inverters. Enphase Energy Proprietary & Confidential [ 38 ]
39. 39. DC Disconnection Procedure Do not disconnect module connectors under load. Disconnecting AC first will eliminate the DC current prior to disconnecting the module. Individual modules could also be covered prior to disconnecting cables during daylight hours Enphase Energy Proprietary & Confidential [ 39 ]
40. 40. Micro-Inverter System Enphase Energy Proprietary & Confidential [ 40 ]
41. 41. Energy Management Unit Installation Step 1 - Power Connection Step 2 - Network Connection Step 3 - EMU Startup Step 4 - Enlighten Registration Step 5 - Fax the Inverter info Step 6 – The Enlighten web site Indicates a fact or feature very important for the safety of the user. Indicates an Enphase recommendation or best practice. Enphase Energy Proprietary & Confidential [ 41 ]
42. 42. Step Step Step Step Step Step 1 2 3 4 5 6 Power Connection Connect the power cord to the EMU power inlet, then plug the power cable into a power outlet somewhere near your internet router. Enphase Energy Proprietary & Confidential [ 42 ]
43. 43. Step Step Step Step Step Step 1 2 3 4 5 6 Power Connection Do not plug the EMU into a power strip or Uninterruptable Power Supply (UPS), the surge suppression or filtering components of the power strip could disrupt the EMU power line communications. Enphase Energy Proprietary & Confidential [ 43 ]
44. 44. Step Step Step Step Step Step 1 2 3 4 5 6 Network Connection Plug the provided CAT5/6 twisted pair Ethernet patch cable into the RJ45 on the EMU. Plug the other end of the Ethernet patch cable into the broadband router. Enphase Energy Proprietary & Confidential [ 44 ]
45. 45. Step Step Step Step Step Step 1 2 3 4 5 6 EMU Startup It takes less than 5 minutes for the EMU to boot. You know that it has booted when it displays An IP address, and shows “+WEB” both in the onboard LCD window. Enphase Energy Proprietary & Confidential [ 45 ]
46. 46. Step Step Step Step Step Step 1 2 3 4 5 6 EMU Startup A newly installed EMU will scan for 1 week. To restart a scan or perform a communication check once the EMU has booted, press and hold the button labeled “SCAN” on the front for 2 seconds. This will enable The LCD panel menu. Enphase Energy Proprietary & Confidential [ 46 ]
47. 47. Step Step Step Step Step Step 1 2 3 4 5 6 EMU LCD Panel Menu Continue holding the “SCAN” button until the desired menu option appears. Release the “SCAN” button to select a menu option. Enphase Energy Proprietary & Confidential [ 47 ]
48. 48. Step Step Step Step Step Step 1 2 3 4 5 6 EMU Startup Device Scan During a device scan the display shows the following: Communication Check After a communication Check the display shows the following Enphase Energy Proprietary & Confidential [ 48 ]
49. 49. Step Step Step Step Step Step 1 2 3 4 5 6 EMU Startup 192.168.2.140 (or whatever the local IP address is) +WEB (indicating that it made a connection to the internet) (n)W (indicating the present power production in watts) (n)kWh (indicating the lifetime watt hours reported to this EMU) (n) (indicating the number of Micro-Inverters reporting to the EMU) Enphase Energy Proprietary & Confidential [ 49 ]
50. 50. Step Step Step Step Step Step 1 2 3 4 5 6 Enlighten Registration Register the EMU with the Enlighten web site by entering the EMU serial number and the site information. Enphase Energy Proprietary & Confidential [ 50 ]
51. 51. Step Step Step Step Step Step 1 2 3 4 5 6 Fax the Micro-inverter Information Fax the completed installation map from the Micro-inverter installation to Enphase at 707-763-0784. Enphase Energy Proprietary & Confidential [ 51 ]
52. 52. Direct Connection to Envoy Enphase Energy Proprietary & Confidential [ 52 ]
53. 53. Step Step Step Step Step Step 1 2 3 4 5 6 The EnlightenTM Website Once the website is configured, energy data will be displayed on the Enphase Enlighten™ website on a per PCU, per module basis. Enphase Energy Proprietary & Confidential [ 53 ]
54. 54. Branch Circuit Calculations, 240 Vac  Circuit Current Calculation –  Maximum Output Power = 190 Watts AC –  190 W ÷ 240 V = .80 Amps –  .80 x 15 inverters = 12.0 amps / branch  Overcurrent Protection Calculation –  12.0 x 1.25 = 15.0 Amps  Conclusions: –  Install 1 to 15 Inverters per branch, up to 2850 Watts –  Minimum 2 Pole 15 Amp circuit breaker, 14 AWG wire size. Enphase Energy Proprietary & Confidential [ 54 ]
55. 55. Branch Circuit Calculations, 208 Vac  Circuit Current Calculation –  Maximum Output Power = 190 Watts AC –  190 W ÷ 208 V = .92 Amps –  .92x 7 inverters per phase = 6.44 amps per phase –  6.44 x 1.73 = 11.14 amps per leg  Overcurrent Protection Calculation –  11.14 x 1.25 = 13.92 Amps  Conclusions: –  Install 1 to 21 inverters per branch, up to 3990 Watts –  Minimum 3 Pole 15 Amp circuit breaker, 14 AWG wire size. Enphase Energy Proprietary & Confidential [ 55 ]
56. 56. Performance Monitoring Reporting Service Enphase Energy is an approved PMRS provider, the Energy Tracking LLC, Web Enabled Meter communicates directly with the Enphase EMU. The metered data is then forwarded to the participating utility. Enphase Energy Proprietary & Confidential [ 56 ]