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PHOTOVOLTAICAMPACITY, DC VOLTAGE, AC VOLTAGE, CONDUCTORAND RACEWAY CALCULATIONS <br />Solar Module Specification: <br />PV Module: <br />Module Number <br />Module Weight: <br />Module Diminsion: <br />DC CondudorAmpacity Calculation for Circuit A: <br />SolarWorld 250 Poty Ambient Temp. ec):1601 Number of Current-Carrying Conductors: 1 4 <br />SW250 poly Temp. Correction per Table 310.16:0.71 Condit Fill Correction per NEC 310.15(B)(2)(a)0.80 <br />46.7 ' <br />65.94 X 39.41 Circuit Conductor Size:1 10 |AnG THWN-2 Circuit ConductorAmpacity:40 Amps <br />27 % '· 01' r <br />...9 # 1 url•i <br />CircuitA <br />Conduit:1 <br />Allowablefill %: <br /> ' Conduit area:0785 <br />4X| 8 |0.152 <br />Allowable Fill:0.314 <br />STEARNS <br />SOLAR <br />1"EMT <br />40°/6 <br />Voc - Solar Module (open-circuit voltage): <br />Vmp (max-power voltage): <br />Isc (short-circuit current): <br />Imp (max-power current): <br />Mfr Voc Temp Coefficient <br />PTC Rating: <br />37.6 Volts Required Circuit ConductorAmpacitv 1.25 X (Parallel Source Circuits) X Source Imp X Paver Factor Equals 37.83 AMPS Result Accecptable <br />30.5 Volts per 690.8(B) 1 2 X 15.13 X 1 = 37.83 <br />Circuit B <br />De-Rated Ampacity of Circuit = Temp. Correction per NEC X Conduit Fill Correction per X Circuit ConductorAmpacity =22.72 AMPS <br />-0.37%.Conductor per NEC Table 310.16 Table 310.16 NEC 310.15(B)(2Xa)#BA\AG BARECOPPER <br />224.7 0.71 X 0.80 X 40 = 22.72 <br />CA LIC# 988327 <br />ELECTRICAL <br />CALCULATIONS <br />Description Date Rev <br />ORIGINAL 4/25/14 A <br />Inverter Specifications: <br />Inverter Model Number:SMA 3000TL-US <br />Output Voltage: ' 240 Volts <br />Max Inverter Continous Output Current: ' 15Amps <br />Maximum Operating Input DC Volatge' 526.4 Volts <br />Maximum Operating Input DC Current ' 17.62 Amps <br />Total Number of Inverters: 1 1 <br />Number of Modules in Series: 9 <br />Number of Strings: 2 <br />Total Number of Modules: 18 <br />Inverter CEC efficiency rating: ' 96.50% <br />Total System Size DC Rating: ' 4.5 kw <br />Total System Size AC Rating:3.9 kw <br />Recommended Maximum STC walt Input' 427 watts <br />DC Spedfications - String Inputs: <br />DC String Voltage (Vmp):274.5 Volts <br />MAX DC String Voltage (Voc):338.4 Volts <br />Operating Current (Imp): ' 16.54 Amps <br />Operating Current (Isc): '17.62 Amps <br />Inverter Maximum System DC Volatge 600 Volts <br />Voltage Correction for Silicon Modules <br />Lowest Ambient Temp|-101 Celcius <br />Volatge Adjustment Factor per NEC 690.7 1.14 <br />Corrceted Voc per 690.7 385.776 Volts <br />Corrected Voc is less than invertersystem maximum <br />Max Length of Wire Run (ft): 0 <br />Wre size AWS # 1 <br />AC ConductorAmpacity Calculation for Circuit C: <br />Ambient Temp. (°C):1 E <br />Temp. Correction per Table 310.16: 0. <br />Circuit Conductor Size:1 1 <br />Required Circuit ConductorAmpacity 1. <br />per 690.8(B) <br />De-Rated Ampacity of Circuit : <br />Conductor per NEC Table 310.16 <br />Max Length of Wire Run (ft): 1 <br />Wire size AWG # 1 <br />AC ConductorAmpacity Calculation for Circuit D: <br />Ambient Temp. ec):1 6 <br />Temp. Correction per Table 310.16: 0. <br />Circuit Conductor Size: 1 <br />30 Current Load <br />10 ' <br />1 <br />71 <br />0 IAAS THWN-2 <br />25 X (NUMBER OF INVERTERS) <br />111 <br />Temp. Correction per NEC <br />Table 310.16 <br />0.71 <br />0 Current Load <br />0 ' <br />0 1 <br />71 <br />3 IA'AG THWN-2 <br />30.264 AMPS <br />240 VOLTS <br />Number of Current-Carrying Conductors: <br />Condit Fill Correction per NEC 310.15(B)(2)(a): <br />Circuit ConductorAmpacity: <br />X ( Maximum Inverter Output / <br />X 15 / <br />X Conduit Fill Correction per X <br />NEC 310.15(B)(21(al <br />X 1.00 X <br />15 AMPS <br />240 VOLTS <br />Number of Current-Canying Conductors: <br />Condit Fill Correction per NEC 310.15(8)(2)Ca): <br />Circuit Conductor Ampacity: <br />Voltage Drop in Percent: 0.38% <br />Voltage Drop in Volts: 0.9 <br />1 3 <br />1.00 23",1 Tnre©Ft 3·.(}c'Jr, 116!er; <br />A. 9/ 2. bilcd ty 11 7,1 :'1':Cs :P.:S 20:var <br />40 Amps , ...0 1 4, 5 <br />(no 208V Conversion)Equals 18.75 AMPS <br />1 = 18,75 <br />Circuit Conductor Ampacity =28.4 AMPS <br />40 = 28,4 <br />Voltage Drop in Percent: 0.16% <br />Voltage Drop in Volts: 0.38 <br />131 <br />1.00 0':Et' TteD e; ·362 1,· ·,- c n <br />A.'PS .1 lulty ·1 7,"- -:; ".2 ,;r <br />fic:or; i Al-9 1 1 64 13555 Amps <br />Circuit C <br />Conduit: |3/4" EMT <br />Allowable fill %:40% <br />EMT area:0442 <br />Conductors in this conduit <br />3 X 10 <br />1 X 8 <br />X <br />Wire cross section: 0.101382 <br />Allowable fill:0.1768 <br />Result Accecptable <br />Circuit D <br />Conduit 1 3/4" EMT <br />Allowable fill %:40% <br />EMT area:0.442 <br />Contractor: <br />Stearns Solar <br />15329 Bonanza Rd Ste B <br />Victorville CA, 92392 <br />License # 988327 <br />760-241-8900 <br />Home Owner: <br />Paul Ziesmer <br />2202 Freeman St. <br />Santa Ana CA, 92706 <br />714-560-0600 <br />Project Address: <br />2202 Freeman St. <br />Conductors in lhis conduit Santa Ana CA, 92706 <br />Solar Back Feed Breaker Required Circuit ConductorAmpacity 1.25 X (NUMBER OF INVERTERS) X (Maximum Inverter Output /(no 208V Conversion)18.75 AMPS 3 X 10Equals <br />per 690.8(B) 1 1 X 15 / 1 = 18.75 1 X8 <br />Maximum Inverter Output 15 Amps X <br />De-Rated Ampacity of Circuit = Temp. Correction per NEC X Conduit Fill Correction per X Circuit Conductor Ampacity =39.05 AMPS <br />Conductor per NEC Table 310.16 Table 310.16 NEC 310.15(B)(2Xa)Wire cross section: 0.101382 <br />0.71 X 1.00 X 55 = 39.05 Allowable fill:0.1768 <br />SO THEN MAXIMUM CURRENT PER NEC 705.60(A)(2) IS <br />15 Amps Max Length of Wire Run (ft): 10 <br />AND THEN PER NEC 705.60(B)Wire size AVO # 8 <br />Current Load 15 AMPS Voltage Drop in Percent: 0,16%Result Accecptable <br />240 VOLTS Voltage Drop in Volts: 0.38 <br />18.75 Amps <br />BRANCH CIRCUIT BREAKER WILL BE 20 AMPS AC ConductorAmpacity Calculation for Wire Circuit E:Existing <br />Ambient Temp. (°C):1 60 1 Number of Current-Carrying Conductors: | 3 <br />Temp. Correction per Table 310.16:0.71 Condit Fill Correction per NEC 310.15(8)(2)(a):1.00 <br />Buss Bar Calculations A <br />Rating:150 AMPS Circuit Conductor Size:8 |A\/03 THWN-2 Circuit Conductor Ampacity:55 Amps <br />I. <br />Circuit E <br />Conduit: 1 3/4" EMT <br />2627 7.irse Pr:.se cting.re:oil Allowable fill%:40% <br />6 -1. 2.3 4 41 73 t:rs th) Fl.y-ic EMT area:0.442 <br />f.tc° ,· : =AMPS / 1 233·, <br />Conductors in this conduit <br />Sum of overcurrents max per NEC 705.12(CD(2):180 AMPS <br />Required Circuit Conductor Ampacity 1.25 X (NUMBEROF INVERTERS) X (Maximum Inverter Output /(no 208V Conversion)18.75 AMPS 3 -X 10Equals <br />MAIN SERVICE FUSE:150 AMPS per 690.8(B) 1 |X 15 / 1 = 18.75 1 X8 <br />MAX ALLOWABLE BACK FEED TO THIS BUSS BAR 30 AMPS X <br />Breaker for solar backfeed: 20 AMPS De-Rated Ampacity of Circuit = Temp. Correction per NEC X Conduit Fill Correction per X Circuit ConductorAmpacity =39.05 AMPS <br />Total of overcurrents:.170 AMPS Conductor per NEC Table 310.16 Table 310.16 NEC 310.15(B)(21(a)Wire cross section: 0.101382 <br />0.71 X 1.00 X 55 = 39.05 Allowable fill:0.1768 <br />overcurrents within NEC 705.12(D)(2) requirements: <br />Max Length of Wire Run (ft): 10 Current Load 15 AMPS Voltage Drop in Percent: 0.16%Result Accecptable <br />Wire size A\AG # 8 '240 VOLTS Voltage Drop in Volts: 0.38 <br />Calculations by Steve Stearns <br />Stearns Solar Lic#988327 <br />steve@solarstoreinc.com <br />PV-5