Photovoltaic Power Systems -2 Grid connected PV - Curtin University

System design
6. Check ampere capacity of each string of inverter, select size
of blocking diode to be 30 % larger than string short circuit
current with diode max voltage more than 2 times of max
system voltage.
8. Select proper wire size so voltage drop for DC side is less
than 3%
8.1 Select wire size between each string to the combiner box
to enable less than 1% voltage drop
8.2 Select wire size between the combiner box to control
box / inverter to enable less than 2% voltage drop
9. Select proper wire size so voltage drop for AC side is less
than 3%
10. Select size of disconnect switch both DC and AC side to
proper rating