18
•
Total I
mp
of the string shall be less than the max. charging current of the
solar battery charger (40A for both 1000VA and 2000VA model)
•
Total V
oc
of the string shall be less than the max. PV input voltage of the
solar battery charger (55V for both 1000VA and 2000VA model).
•
Total I
sc
of the string shall be less than the max. PV input current of the
solar battery charger (40A for both 1000VA and 2000VA model).
Example 1 - How to connect 1000VA model to PV panels with the
following parameters?
•
P
max
: 80W
•
V
oc
: 21.6V
•
I
sc
: 5.17A
•
V
mp
: 17.2V
•
I
mp
: 4.65A
(1)
The max. PV input power for 1000VA model is 450W,
450W / 80W = 5.6
⇒
max. 5 PV panels shall be connected.
(2)
Operating Voltage Range is 15~18V,
18V/17.2V = 1.04
⇒
max. number of PV panel in series is 1.
(3)
Max. charging current is 40A,
40A/5.17A = 7.7
⇒
max. number of PV panel in parallel is 7.
(4)
Taking (1)~(3) into consideration, the optimized configuration is 5 PV
panels in parallel, as shown below
(5)
Check again the V
oc
and I
sc
of PV string,
V
oc
of string is 21.6V < 55V (Max. PV Input Voltage)
⇒
OK
I
sc
of string is 5 x 5.17A = 25.9A < 40A (Max. PV Input Current)
⇒
OK
