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Example 2 - How to
connect 2000VA model to PV panels with the
following parameters?
•
P
max
: 120W
•
V
oc
: 21.7V
•
I
sc
: 8.76A
•
V
mp
: 17.45V
•
I
mp
: 7.01A
(1)
The max. PV input power for 2000VA model is 900W,
900W / 120W = 7.5
⇒
max. 7 PV panels shall be connected.
(2)
Operating Voltage Range is 30~36V,
36V/17.45V = 2.1
⇒
max. number of PV panel in series is 2.
(3)
Max. charging current is 40A,
40A/7.01A = 5.7
⇒
max. number of PV panel in parallel is 5.
(4)
Taking (1)~(3) into consideration, the optimized configuration is 2 PV
panels in series as a string, and 3 strings in parallel (as shown below).
(5)
Check again the V
oc
and I
sc
of PV string,
V
oc
of string is 2 x 21.7V = 43.4V < 55V (Max. PV Input Voltage)
⇒
OK
I
sc
of string is 3 x 8.76A = 26.3A < 40A (Max. PV Input Current)
⇒
OK
