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Assumption
Assumption
SOLARMAN 200W PV modules and SUNMAN 3.6 inverter are selected.
PV cell temperature range is 20 °C - 75 °C
SUNMAN Inverter Datasheet
SOLARMAN 200W PV Module Datasheet
7. to 10. are temperature coefficients.
Concept
Concept
Voc STC Open circuit voltage of the PV module at STC (V)
Voc max Maximum open circuit voltage of the PV module (V)
βVoc Temperature coefficient for open circuit voltage (% °C⁻¹ or % K⁻¹)
Tmod min Lowest module temperature (°C)
Assume 20°C if not given.
TSTC Module temperature at STC (°C), 25 °C
3.1 Calculate βVoc
3.1 Calculate βVoc
βVoc_v Temperature coefficient for open circuit voltage (V°C-1 or VK⁻¹)
βVoc = (-0.1368 VK⁻¹ / 37.47 V) *100% = - 0.3651%K⁻¹
3.2 Calculate Voc max
3.2 Calculate Voc max
During inverter in OFF state, the highest open circuit module voltage is 38.154 V.
3.3 Calculate Ns max abs
3.3 Calculate Ns max abs
Ns max abs Maximum number of PV modules in series based on maximum open circuit voltage (units)
Vmax abs inv Maximum absolute input voltage of the inverter (V).
Inverter will be damage if inverter input voltage higher than this value.
Refer to inverter datasheet --> DC input voltage
Ns max abs = round down [ 600 / 38.154] = round down [15.73] =15
The maximum number of PV modules in series that shall not exceed the maximum absolute input voltage of the inverter is 15 units.
Reference
Reference
Design And Sizing of Grid-Connected Photovoltaic Power System - SEDA Malaysia- 4th Published 2023
Example 4.3
SEDA GCPV Tutorial Design - Nov 2024
2. Sizing with string or central inverter - Question 3
2. Sizing with string or central inverter - Question 4
2. Sizing with string or central inverter - Question 5
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