tovoltaic System Electrical Diagram
for PV Systems of 10 kW or less
SIZE
FSCM NO
DWG NO
REV
A
E1.1
2
SCALE
NTS
Date:
SHEET
Drawn By:
Drawn By:
Drawn By:
Checked By:
_______ Modules in Series
________ Modules in Series
________ Modules in Series
________ Modules in Series
INVERTER
AC DISCONNECT
AC
DC
+
-
UNUSED SERIES STRINGS
LEAVE BLANK BELOW
OCPD = OVERCURRENT PROTECTION
DEVICE (IF NO OCPDLEAVE ITEM BLANK)
SERVICE VOLTAGE = _______V
MAIN OCPD RATING = _______A
INVERTER OCPD
AMPERE RATING = _______A
SERVICE PANEL RATINGS
AMP RATING =_____ A
VOLT RATING = _____ V
FUSE VALUES PER STRING:
SOURCE COMBINER RATINGS
PV MODULE RATINGS @ STC
MODULE MODEL # ________________
MODULE MANUFACTURER _Sanyo________
OPERATING VOLTAGE = ________V
MAX SYSTEM VOLTAGE = _______V
OPERATING CURRENT = ______A
OPEN-CIRCUIT VOLTAGE = _______V
MAXIMUM POWER (at
25°C
) = ______W
SHORT-CIRCUIT CURRENT = _____A
MAX SERIES FUSE (OCPD) = ______A
SOURCE CIRCUIT CONDUCTOR TYPE
(OUTSIDE CONDUITCIRCLE ONE) USE-2; PV WIRE
SOURCE CIRCUIT CONDUCTOR SIZE
(SEE NOTES FOR ARRAY WIRING) _____AWG
SOURCE CIRCUIT CONDUCTOR TYPE
(INSIDE CONDUITCIRCLE ONE) THWN-2; XHHW-2; RHW-2; USE-2
M
UTILITY SERVICE
690.53 PHOTOVOLTAIC POWER
SOURCE SIGN ON DC DISCO
OPERATING CURRENT = ______A
OPERATING VOLTAGE = _______V
MAX SYS VOLTAGE =______V
SHORT-CIRCUIT CURRENT = ______A
PV ARRAY INFORMATION
# OF PARALLEL CIRCUITS ______
STRING SIZING CALCULATION DONE?
____ YES ____ NO
# OF MODULES IN SERIES ______
MAX DC VOLT RATING = ______V
MAX POWER @ 40
o
C = ______W
NOMINAL AC VOLTAGE = ______V
MAX AC CURRENT = _______A
MAX OCPD RATING = _______A
INVERTER RATINGS
DISCO VOLT RATING = ______V
OCPD AMP RATING = ________A
OCPD VOLT RATING = ________V
DISCO AMP RATING = _____A
AC DISCONNECT RATINGS
DISCO VOLT RATING = ______V
OCPD AMP RATING = ________A
OCPD VOLT RATING = ________V
DISCO AMP RATING = ______A
DC DISCONNECT RATINGS
GROUNDING
ELECTRODE
MAIN SERVICE PANEL
G
MAIN
OCPD
INVERTER
OCPD
SEE NOTE 3 FOR
INVERTER CIRCUITS
ON NOTES PAGE
SEE NOTE 2 FOR INVERTER
CIRCUITS ON NOTES PAGE
SEE NOTE 1 FOR INVERTER
CIRCUITS ON NOTES PAGE
System Summary
1
2
3
6
4
5
7
8
PV Site Address
Electric Service Main: ___________ Amps
PV System Size: ___________ Watts AC
PV System Azimuth: ___________
PV System Tilt: ___________ NOTES FOR ARRAY WIRING:
1.) ASHRAE FUNDEMENTALS OUTDOOR DESIGN TEMPERATURES DO NOT EXCEED 47
o
C IN
THE UNITED STATES (PHOENIX, AZ; PALM SPRINGS, CA).
2) FOR LESS THAN 9 CURRENT-CARRYING CONDUCTORS IN ROOF-MOUNTED SUNLIT
CONDUIT AND USING THE OUTDOOR DESIGN TEMPERATURE OF 47
o
C,
a) 12 AWG CONDUCTORS ARE GENERALLY ACCEPTABLE FOR MODULES WITH Isc OF 6.4
AMPS OR LESS WHEN PROTECTED BY A 10-AMP FUSE.
b) 10 AWG CONDUCTORS ARE GENERALLY ACCEPTABLE FOR MODULES WITH Isc OF 9.6
AMPS OR LESS WHEN PROTECTED BY A 15-AMP FUSE.
NOTES FOR INVERTER INPUT AND OUT CIRCUITS:
1) SIZE PHOTOVOLTAIC POWER SOURCE (DC) CONDUCTORS BASED ON MAX CURRENT ON
690.53 SIGN OR OCPD RATING AT DISCONNECT (IF SUPPLIED).
2) SIZE INVERTER OUTPUT CIRCUIT (AC) CONDUCTORS ACCORDING TO INVERTER OCPD
AMPERE RATING.
General Notes
Data Box Specific Notes
1. PV module rating information is available from manufacturers data sheet.
2. String-sizing calculation is typically offered by inverter manufacturer. See, for
example the string sizing calculator at www.sma-america.com
3. Note that PV output circuit fuses may be located either at the DC disconnect
or at a separate combiner box.
4. Maximum system voltage is the product of the Voc of the panels x # panels
per string # ambient temperature correction factor. Per NEC 690.7, for typical
Pasadena temperatures, the correction factor would be 1.13.
5. DC disconnect ratings per manufacturer
6. Inverter ratings per manufacturer.
7. AC disconnect ratings per manufacturer/
8. Service panel ratings from service panel manufacturer and inverter output
circuit values.