HomeMy WebLinkAboutPV Worksheet - Standard String (2)
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PHOTOVOLTAIC SYSTEMS
PV WORKSHEET – STANDARD STRING ARRAY
Solar photovoltaic (PV) systems have widely gained acceptance as an alternative energy
source and installations range from the small array supplying a bus stop luminaire to a
large array that covers acres. Since each installation comes with its own characteristics
this worksheet has been provided for the installer to complete and submit with a Solar
Photovoltaic (PV) Permit Application. With this information in advance the inspector
can get a good idea of what the project entails and perhaps warn the installer of an
electrical code issue before the installation is complete. The entire PV system
installation shall comply the Article titled Solar Photovoltaic (PV) System in the currently
adopted National Electrical Code (NEC).
The following documentation must be provided with the PV Permit Application:
1. Pages 2 and 3 of this document
2. Equipment spec/cut sheets for grounding/bonding fittings, modules, inverters,
micro inverters, or optimizers (if these are not available complete page 4 of this
document)
3. A one-line diagram of the PV system including service interconnection
4. A site plan showing the relative location of the array and the PV equipment on
the property. Also provide location of service and distance from array.
5. Roof mounted arrays shall have engineering certifying the existing roof will
support the imposed load.
6. Roof mount and Ground mounted arrays shall be engineered to withstand 125
mph wind load.
A PV installer is allowed to construct the support system, mount the modules, inverters
or optimizers, and connect the factory provided module wiring harness (plug and play).
The remainder of the installation such as panel boards, raceways, boxes, fittings,
breakers, and building wire shall be installed by a licensed electrical contractor.
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STANDARD STRING ARRAY
PV SYSTEM INFORMATION
TYPE OF ARRAY
Y N Y N
Roof Array? ☐ ☐ Rapid Shutdown Required (690.12)? ☐ ☐
Ground Array? ☐ ☐ Guarding of Conductors Required (690.31A)? ☐ ☐
PV SYSTEM OVERVIEW
Maximum System Voltage
# Modules/String
# Strings in System
Maximum Circuit Current
Battery Storage? Y N
CALCULATIONS:
MAXIMUM SYSTEM VOLTAGE – 690.7(A);
(Voc) (module label) X Thermal Coefficient3 X # of modules/string = VMAX
MAXIMUM CIRCUIT CURRENT - 690.8(A)(1):
(Isc)(module label) X (Sum of the paralleled modules) X 125% = IMAX
OVERCURRENT DEVICE RATING – 690.9(B):
( Imax ) X 125% = OCPD2
1Supply side connections may be allowed by your utility and shall comply with 705.12(A)
2OCPD – Overcurrent Protective Device
LOAD SIDE CONNNECTION1
Service Voltage
Service Panel Main Breaker
Service Panel Bus Rating
Service Conductor Size
PV System OCPD2 Rating
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STANDARD STRING ARRAY
CONDUCTOR AND RACEWAY SCHEDULE
Conductor Type Conductor
AWG
Conduit
Type
Conduit
Size
1 Copper Grounding Electrode Conductor
Copper Equipment Grounding Conductor . NA NA
2 PV Source Conductors
USE-2 PV Wire . NA NA
3 THWN-2 XHHW-2 RHW-2 . . .
4 THWN-2 XHHW-2 RHW-2 . . .
5 THWN-2 XHHW-2 RHW-2 . . .
6 THWN-2 XHHW-2 RHW-2 . . .
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STANDARD STRING ARRAY
COMPONENT RATINGS
PV MODULE RATINGS
Module Name
Module Model
Open Circuit Voltage
Short Circuit Current
Maximum Power
Maximum Voltage
Thermal Coefficient3
INVERTER RATINGS
Inverter Name
Inverter Model
Maximum DC Volt Rating
Maximum Power at 40°C
Nominal AC Voltage
Maximum AC Current
Maximum OCPD2
3Use thermal coefficient as provided by manufacturer. If not provided, use 1.20. (690.7)