Wire Size

Wire Size Calculation

This spreadsheet has 3 sections. The first section uses the data as determined by the power spreadsheet.This will then calculate the resistance and the voltage drop. The main reason we calculate all this stuffAnd it's usually much colder that that around here that all winter. The second section is to make the sameCalculation, but by plugging in the values yourself. The third section is a much simplified version to helpcalculate wiring for non PV applications. The places you enter data are purple.

Array Data Standalone CalculationOpen Circuit Voltage 43.1 Open Circuit VoltageShort Circuit current of panel 5.46 Short Circuit current of panelCold Weather factor (-40F) 1.25 Cold Weather factor (-40F)True Amperage per panel 6.83 True Amperage per panelNumber of panels in series 2 Number of panels in seriesNumber of parallel strings 6 Number of parallel stringsSeries Per Wire Run 4 Series Per Wire RunTotal Array Amperage 51.19 Total Array AmperageMax Array Voltage 107.75 Max Array VoltageMax Wire Run Amperage 34.1266667 Max Wire Run AmperageMax Wire Run Voltage 71.8333333 Max Wire Run VoltageMax Wire Ampacity 42.5866667 Max Wire AmpacityAWG Wire Gauge 2 AWG Wire GaugeDistance 135 DistanceVoltage 48 VoltageTemperature 90 TemperatureTemp Factor for Copper 0.0032 Temp Factor for CopperTemp Change Factor 1.0485 Temp Change FactorResistance From NEC Table 8 #N/A Resistance From NEC Table 8Voltage Loss #N/A Voltage LossVoltage Drop #N/A #N/A Voltage Drop

Non PV WiringAmperage 20Wire Ampacity 31.2AWG Wire Gauge 8Distance 10Voltage 24Temperature 120Temp Factor for Copper 0.0032Temp Change Factor 1.1454Resistance From NEC Table 8 #N/AVoltage Loss #N/AVoltage Drop #N/A #N/A

Notes:

The formula for adjusting NEC table 8 for temperature is as follows:R2 = R1 [1 + acu(T2 – 75F)] where Acu = 0.00323

This spreadsheet has 3 sections. The first section uses the data as determined by the power spreadsheet.

And it's usually much colder that that around here that all winter. The second section is to make the same

Open Circuit Voltage 43.1Short Circuit current of panel 5.46Cold Weather factor (-40F) 1.25True Amperage per panel 6.825Number of panels in series 2Number of parallel strings 6Series Per Wire Run 6Total Array Amperage 51.1875Max Array Voltage 107.75Max Wire Run Amperage 51.1875Max Wire Run Voltage 107.75Max Wire Ampacity 63.882AWG Wire Gauge 1/0

1304850

Temp Factor for Copper 0.0032Temp Change Factor 0.9193Resistance From NEC Table 8 0.11215

1.862713.88% OK

Comments

Enter the max open circuit voltage of the panel.I11:

Enter the short circuit current of the panel.I12:

Enter the number of panels in a series string.I15:

Enter the number of parallel strings.I16:

Enter the number of parallel strings for each wire run.D17:

Enter the number of parallel strings for each wire run.I17:

Enter the AWG wire gauge you wish to use.D23:

Enter the AWG wire gauge you wish to use.I23:

Enter the distance between the PV panel combiner box and the charge controller.D24:

Enter the distance between the PV panel combiner box and the charge controller.I24:

Enter the voltage of the wire run between the PV panels and the charge controller.D25:

Enter the voltage of the wire run between the PV panels and the charge controller.I25:

Enter the lowest or highest Operating temperature. This effects the resistance.D26:

Enter the lowest or highest Operating temperature. This effects the resistance.I26:

Enter the AWG wire gauge you wish to use.D37:

Enter the distance between the PV panel combiner box and the charge controller.D38:

Enter the voltage of the wire run between the PV panels and the charge controller.D39:

Enter the lowest or highest Operating temperature. This effects the resistance.D40:

VoltDrop

Voltage drop

NEC Table 8DC Resistance at 167F, 1000 feet, stranded

AWG Conductors Area Cir. Copper CopperMils Uncoated Coated

18 7 1620 7.9500 8.4500 0.008516 7 2580 4.9900 5.2900 0.005314 7 4110 3.1400 3.2600 0.003312 7 6530 1.9800 2.0500 0.002110 7 10380 1.2400 1.2900 0.00138 7 16510 0.7780 0.8090 0.00086 7 26240 0.4910 0.5100 0.00054 7 41740 0.3080 0.3210 0.00033 7 52620 0.2450 0.2540 0.00032 7 66360 0.1940 0.2010 0.00021 19 83690 0.1540 0.1600 0.0002

1/0 19 105600 0.1220 0.1270 0.00012/0 19 133100 0.0967 0.1010 0.00013/0 19 167800 0.0766 0.0797 0.00014/0 19 211600 0.0608 0.6080 0.0006

Circuit ResistanceBattery @ 12VDC 0.0015Battery @ 24VDC 0.0030Battery @ 48VDC 0.0060Battery contacts 0.0016Inverter contacts 0.0004Breaker 0.0020Conductors 0.0024

Drop = Current in Amps x resistance per foot x lengthVoltage drop= Amp x ohms

VoltDrop

NEC Table 8DC Resistance at 167F, 1000 feet, solid

AWG Area Cir. Copper CopperMils Uncoated Coated

18 1620 7.7700 8.0800 0.008116 2580 4.8900 5.0800 0.005114 4110 3.0700 3.1900 0.003212 6530 1.9300 2.0100 0.002010 10380 1.2100 1.2600 0.00138 16510 0.7640 0.7860 0.0008

Correction Factor for Crystalline Panels

High Temp Low Temp Factor77 50 1.0649 32 1.131 14 1.1313 -4 1.17-5 -40 1.25

NewPanels

New Panels Project

Size Quantiy Cost TotalPV Panels 165 12 $545.00 $6,540.00PV Rack 12 Panels 2 $269.00 $538.00

$7,078.00

#2 AWG 500' 1 $175.00 $175.00 Colotex Electric#10AWG/2 500' 1 $30.38 $30.38#Cat 5e 1000' 2 $51.30 $102.60#14AWG Speaker 500' 1 $14.70 $14.70#2 Bare Ground 250' 1 $31.25 $31.25

$322.68

PVC Pipe 1.5 14 $3.29 $46.06 Home Depot90 Elbows 1.5 2 $1.99 $3.9845 Elbows 1.5 3 $1.69 $5.07Male Thread 1.5 2 $0.59 $1.18Access Fitting 1.5 1 $5.94 $5.94Coupling 1.5 1 $0.59 $0.59Locknut 1.5 1 $0.66 $0.66

$63.48

PVC Pipe 0.75 14 $1.17 $16.3890 Elbows 0.75 2 $0.75 $1.5045 Elbows 0.75 3 $0.65 $1.95Male Thread 0.75 2 $0.37 $0.74Access Fitting 0.75 1 $2.99 $2.99Coupling 0.75 1 $0.75 $0.75Locknut 0.75 1 $0.24 $0.24

$24.55

Combiner Box

30A Fuse Block 75747 3 $9.82 $29.46 Colotex Electric8A Fuses 74778 5 $4.49 $22.45Isolated Ground Kit 15850 2 $7.50 $15.00Equip Ground, 12 lugs 15846 2 $2.03 $4.06Lugs #6-2/0 15843 2 $3.30 $6.60NEMA 3R Box (8x12) 1 $23.16 $23.16Delta Lightening Arrestor 1 $39.00 $39.00

$139.73

PV Subtotal $7,078.00PVC Subtotal $88.03Wire Subtotal $322.68Combiner Box $24.55Total $7,513.26

NewPanels

Junction Box (6x6x4) 1 $10.95 $10.95

NewPanels

Colotex Electric

NewPanels

Comments

5 foot sectionsC15:

5 foot sectionC24:

Wire Size

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