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Assumption
Assumption
PV Datasheet
Voc Tolerance = ±3%
βVoc = -0.27%/°C
γpmax = -0.35%/°C
VOC STC = 48.3 V
VPmax STC = 40.5 V
Concept
Concept
Tmod Temperature module at ROC (°C)
Obtain from Step 1 PV Device Temperature
TSTC STC temperature = 25°C
VOC Open circuit voltage at ROC
VPmax Voltage at maximum power at ROC
VSC STC Open circuit voltage at STC
VPmax STC Voltage at maximum power at STC
ftemp_Voc Factor due to temperature for open circuit voltage (decimal)
ftemp_Vpmax Factor due to temperature for voltage at maximum power (decimal)
βVoc Temperature coefficient for open circuit voltage (% C⁻¹)
βVpmax Temperature coefficient for voltage at maximum power (% C⁻¹)
Assume βVpmax = γpmax (Temperature coefficient of maximum power) if not given
fmm Voc Factor due to voltage mismatch_open circuit voltage (decimal)
fmm Vpmax Factor due to voltage mismatch_voltage at maximum power (decimal)
Step 3.1 Calculate fmm
Step 3.1 Calculate fmm
Open Circuit Voltage, Voc
fmm Voc = [ 100% - Open Circuit Voltage Tolerance(%) ] / 100%
Open circuit voltage tolerance can refer to PV datasheet (Take worst case)
If didn't state, assume fmm Voc = 1
fmm Isc = [100-3] /100 = 97% = 0.97
Voltage At Maximum Power, VPmax
fmm Vpmax = [ 100% - Mismatch Voltage ] / 100%
Mismatch voltage can refer to PV datasheet
If didn't state, assume fmm Vpmax = 1
Assumption didn't provide mismatch voltage so assume fmm Vpmax = 1
Step 3.2 Calculate ftemp i
Step 3.2 Calculate ftemp i
The formula is similar to ftemp_ave in Step 1 Choose PV Module >> 1.4 Calculate ftemp_ave
From Step 1 PV Device Temperature , Tmod = 68℃
Open Circuit Voltage, Voc
Voltage At Maximum Power, VPmax
Since βVpmax is not given, assume βVpmax = γpmax
Step 3.3 Calculate Voltage
Step 3.3 Calculate Voltage
Open Circuit Voltage, Voc
Voltage At Maximum Power, VPmax
Reference
Reference
Fundamental of Solar Photovoltaics Technology - SEDA Malaysia- 3rd edition 2023
Example 5.6
SEDA GCPV Tutorial Fundamental - 28 Nov 2024
Photovoltaics Technology - Question 4
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