24
Total V
mp
of the string shall be within the operating voltage range of solar
battery charger (16~18V for POWERBACK PB1000S model and 30~32V for
POWERBACK PB2000S model are recommended).
Total I
mp
of the string shall be less than the max. charging current of the solar
battery charger
Total V
oc
of the string shall be less than the max. PV input voltage of the solar
battery charger (55V for all model).
Total I
sc
of the string shall be less than the max. PV input current of the solar
battery charger (65A for all model).
Example 1 - How to connect POWERBACK PB1000S model to PV panels
with the following parameters?
P
max
: 150W
V
oc
: 21.6V
I
sc
: 8.75A
V
mp
: 18V
I
mp
: 8.2A
(1)
Max. charging current is 60A,
60A/8.2A = 7.31
max. number of PV panel in parallel is 7.
(2)
Operating Voltage Range is 16~18V,
One PV panel V
mp
18V is between 16~18V
max. number of PV panel in
series is 1.
(3)
Taking (1)~(2) into consideration, and the optimized configuration is 7 PV
panels in parallel, as shown below
(4)
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 7x 8.75A = 61.25A < 65A (Max. PV Input Current)
OK
