BLD2023-0202_Structural_Calculations_2.16.2023_10.17.37_AM_3373117STRING CALCULATIONS
ENPHASE : IQ8M-72-2-US (240V)
STRING #1
STRING #2
STRING #3
MAX AC CURRENT
13.54A
13.54A
11.85A
MICRO INVERTER(S) IN SERIES:
8
8
7
NOMINAL VOLTAGE / RANGE
211V - 264V
211V - 264V
211V - 264V
MAX AC OUTPUT POWER:
260OW
260OW
2275W
ARRAY DC POWER:
10350W
TOTAL MAX AC CURRENT:
31.15A
NUMBER OF CURRENT CARRYING CONDUCTORS
PERCENT OF VALUES
4-6
.80
7-9
.70
10-20
.50
SYSTEM OCPD CALCULATIONS
INVERTER MODEL(S):
EN PHASE IQ8M-72-2-US (240V)
# OF INVERTER(S):
23
MAX OUTPUT CURRENT:
1.35A
(# OF INVERTERS) X (MAX OUTPUT CURRENT) X 125% <= OCPD RATING
(23 X 1.35A X 1.25) = 38.93A <= 40A, OK
PV LOAD CALCULATIONS: SUPPLY SIDE TIE-IN
FEEDER WIRE RATING:
200A
ALLOWABLE SOLAR CALCULATION
(FEEDER RATING - 1.25)
160.000OA (FEEDER WIRES ALLOWABLE SOLAR)
160.000OA (AVAILABLE FOR PV)
Conduit & Conductor Schedule
TAG
CITY
WIRE GAUGE
DESCRIPTION
CONDUIT SIZE
CONDUCTOR RATING
CONDUCTOR TEMP. RATE
AMBIENTTEMP
TEMP. DERATE
# OF CONDUCTORS
DERATE
CONDUCTOR RATING
W/DERATES
CONDUIT FILL
1
(2)
12 AWG
Q-CABLE , COPPER (L1, L2)
N/A - FREE AIR
30A
900C
260C
1.0
N/A - FREE AIR
30A
N/A - FREE AIR
(1)
12 AWG
THWN-2 COPPER- (GROUND)
2
(2)
10 AWG
THHN/THWN-2, COPPER - (L1, L2)
3/4" PVC
40A
90°C
26°C
1.0
1.0
40A
12.03%
(1)
10 AWG
THWN-2 COPPER - (GROUND)
3
(6)
10 AWG
THHN/THWN-2, COPPER - (L1, L2)
3/4" PVC
40A
90°C
26°C
1.0
0.8
32A
28.07%
(1)
10 AWG
THWN-2 COPPER - (GROUND)
4
(3)
8 AWG
THHN/THWN-2, COPPER - (L1, L2, NEUTRAL)
3/4" PVC
55A
90°C
26°C
1.0
1.0
55A
28.07%
(1)
8 AWG
THWN-2 COPPER - (GROUND)
5
(3)
6 AWG
THHN/THWN-2, COPPER - (L1, L2, NEUTRAL)
3/4" PVC
65A
75°C
26°C
1.0
1.0
65A
38.37%
(1)
6 AWG
THWN-2 COPPER - (GROUND)
GROUNDING & GENERAL NOTES:
1. PV INVERTER IS UNGROUNDED, TRANSFORMER -LESS TYPE.
2. DC GEC AND AC EGC TO BE SPLICED TO EXISTING ELECTRODE
3. ANY EXISTING WIRING INVOLVED WITH PV SYSTEM CONNECTION THAT IS FOUND TO
BE INADEQUATE PER CODE SHALL BE CORRECTED PRIOR TO FINAL INSPECTION.
4. JUNCTION BOX QUANTITIES, AND PLACEMENT SUBJECT TO CHANGE IN THE FIELD -
JUNCTION BOXES DEPICTED ON ELECTRICAL DIAGRAM REPRESENT WIRE TYPE
TRANSITIONS.
5. AC DISCONNECT NOTED IN EQUIPMENT SCHEDULE OPTIONAL IF OTHER
AC DISCONNECTING MEANS IS LOCATED WITHIN 10' OF SERVICE DISCONNECT.
INTERCONNECTION NOTES:
1. INTERCONNECTION SIZING, LIMITATIONS AND COMPLIANCE DETERMINED IN ACCORDANCE WITH [NEC
705.121, AND [NEC 690.64].
2. GROUND FAULT PROTECTION IN ACCORDANCE WITH [NEC 215.9], [NEC 230.95] AND [NEC 690.5]
3. ALL EQUIPMENT TO BE RATED FOR BACKFEEDING.
4. PV BREAKER TO BE POSITIONED AT THE OPPOSITE END OF THE BUSBAR RELATIVE TO THE MAIN BREAKER.
DISCONNECT NOTES
1. DISCONNECTING SWITCHES SHALL BE WIRED SUCH THAT WHEN THE SWITCH IS OPENED THE CONDUCTORS
REMAINING LIVE ARE CONNECTED TO THE TERMINALS MARKED "LINE SIDE" (TYPICALLY THE UPPER TERMINALS)
2. AC DISCONNECT MUST BE ACCESSIBLE TO QUALIFIED UTILITY PERSONNEL, BE LOCKABLE, AND BE A
VISIBLE -BREAK SWITCH
S L A R
Revolution Energy Systems Inc.
9981 West 190th St
Unit K Mokena IL 60448
T: 708-995-1643
SITE INFORMATION
NATHAN MOSS
19220 76TH AVE W
SEATTLE, WA 98133
AC System Size: 7.48 kW AC / 7.48 kVA
DC System Size: 10.35 kW DC
Lat, 47.82465
Long,-122.33644
(23) CANADIAN SOLAR CSW3-45OMS (450W)
PV Modules
(23) ENPHASE IQ8M-72-2-US (240V)
Inverter(s)
SNOHOMISH COUNTY PUD
DRAWN BY: ALINSUG W.
DATE:
2/3/2023
ELECTRICAL CALCS - PV06