APPENDIX A
How to Select and Configure PV Panels
The following parameters can be found in each PV panel’s specification:
•
P
max
: Max output power (W)
•
V
oc
: open-circuit voltage (V)
•
I
sc
: short-circuit current (A)
•
V
mp
: max power voltage (V)
•
I
mp
: max power current (A)
PV panels can be connected in series or parallel in order to obtain the desired
output voltage and current which meets the inverter’s allowed range.
When connecting PV panels in series, the max voltage and current of the string is
V
string
= V
1
+V
2
+V
3
+V
4
…
I
string
= I
1
=I
2
=I
3
=I
4
When connecting the above PV string in parallel, the max voltage and current of
the total string is
V
total
= V
string1
=V
string2
=V
string3
=V
string4
…
I
total
= I
string1
+I
string2
+I
string3
+I
string4
In either case, the total output power is P
total
= P
panel
X Number of PV panel
The guideline to select and configure PV string is
•
P
total
shall be equal or slightly larger than the max. capacity of solar battery
charger (2000W for 3000VA model and 3750W for 5000VA model).
Extra
capacity in PV string will not increase the charge capacity but only result in
higher installation cost.
Model
PV panels
installed
Max. PV module to support load
3000VA 2000W
1600W
5000VA 3750W
3200W
