17
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 (450W for 1000VA model and 900W for 2000VA model).
Surplus capacity of PV string does not help the solar charger’s capacity
and only result in higher installation cost.
•
Total V
mp
of the string shall be within the operating voltage range of
solar battery charger (15~18V for 1000VA model and 30~36V for 2000VA
model are recommended).
