Step 5 DC Cable Sizing - Power Loss

Step 5.1 Calculate Pdc

Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area

• Idc_string = 7.9875 A

• Idc_array = 15.975 A

• Adc cable_string = 2.5 mm²

• Adc cable_array = 2.5 mm²

Step 5.3 Calculate %Power Loss

%Power Loss Percentage of power loss in cable (%)

• Power loss loss value is subjective in real life, around <2.5%.

Idc_singlePV Maximum possible operating current in cable for single PV module (A) 

• Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.1 Calculate Idc

• Idc_singlePV = IPmax STC * 1.25

Idc_array Maximum possible operating current in cable for array (A) 

• 1. 1. 1. 1. 1. 1. • • Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.1 Calculate Idc

VPmax min_singlePV Minimum voltage of string at maximum power for single PV module (V) or

• Minimum voltage at maximum power for each module

• Minimum module output voltage per MPPT

• Step 3 Voltage >> Voltage at maximum power, VPmax when Tmod is maximum

  1. 1. 1. 1. 1. • • Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.2 Calculate Vnom

                   • VPmax min_singlePV = VPmax min string (Series connection sharing same voltage according to Ohm's Law)

Vnom_string Nominal voltage for one string of PV modules (V) 

• 1. 1. 1. 1. 1. • • Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.2 Calculate Vnom

Np Total PV modules in portrait per string (units)

Ns Total PV modules in series per string (units)

Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area

• Idc_array = 15.975 A

• Vnom_string = 690.48 V