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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
I
total
shall be equal or slightly larger than the max. capacity of solar battery
charger. Surplus capacity of PV string does not help the solar charger’s capacity
and only result in higher installation cost.
Model
PV panels invested(
I
total
)
Max. PV module to support load
POWERBACK PB1000S
60A
600W
POWERBACK PB2000S
60A
1200W
