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Assumption
Assumption
PV cell temperature range is 20 °C - 75 °C
KSO-340 PV modules and PZ370 DC power optimiser are selected
Datasheet KSO-340 PV module at STC
Datasheet PZ DC power optimiser
Concept
Concept
Ns max abs opt = round down [Vmax abs abs opt] / [Voc max]
Ns max abs opt Maximum number of PV modules in series based on maximum open circuit voltage of DC power optimiser
Vmax abs opt Maximum absolute input voltage of the DC power optimiser
Voc max Maximum open circuit voltage of the PV module
2.1 Calculate Voc max
2.1 Calculate Voc max
Voc STC Open circuit voltage of the PV module at STC (V)
βVoc Temperature coefficient for open circuit voltage (% °C⁻¹ or % K⁻¹)
Tmod min Lowest module temperature (°C)
TSTC Module temperature at STC (°C), 25 °C
2.2 Calculate Ns max abs opt
2.2 Calculate Ns max abs opt
Ns max abs opt = round down [60/46.611] = round down [1.28] = 1 unit
Maximum number of PV module that could be connected in series with DC power optimiser is 1 unit.
Reference
Reference
Design And Sizing of Grid-Connected Photovoltaic Power System - SEDA Malaysia- 4th Published 2023
Example 6.2
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