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Assumption
Assumption
Longest length of string cable = 8m
Longest length of array cable = 5m
Copper cable
Concept
Concept
Vdrop dc Voltage drop of cable on DC side (V)
Adc cable CSA of cable (mm²)
Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.4 Decide cable size
╳ Amin dc cable
Ldc cable Length of the longest string/array cable (m)
Sometimes positive & negative wire length might not equal.
Idc Maximum possible operating current in cable (A)
Refer to Step 2 DC Cable Sizing - Min. Cross-Sectional Area >> Step 2.1 Calculate Idc
ρ Resistivity of cable, assume copper if assumption not given (Ω mm² m⁻¹)
Copper = 1/56
Alumminium = 1/34
Step 3.1 Calculate Idc and Adc cable
Step 3.1 Calculate Idc and Adc cable
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 3.2 Calculate Vdrop dc
Step 3.2 Calculate Vdrop dc
Step 3.3 Calculate %Vdrop dc
Step 3.3 Calculate %Vdrop dc
%Vdrop dc Percentage of voltage drop of cable on DC side (%)
According to MS1837:2018, the voltage drops between the PV array and the inverter shall be < 3%.
From Energy Hub - Step 2 DC Cable Sizing - Min. Cross-Sectional Area,
VPmax min string = 32.88 V
Ns = 21
Reference
Reference
Fundamental of Solar Photovoltaics Technology - SEDA Malaysia- 3rd edition 2023
Example 7.3
Example 7.4
SEDA GCPV Tutorial Fundamental - 28 Nov 2024
Balance of System Components - Question 5
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