REV110619
SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | (805) 640-6700 | info@simpliphipower.com |
SimpliPhiPower.com
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in the coldest weather conditions at the installation site: 500V ÷ 43.3V = 11.6 (round
down to the next whole number).
o
Eleven
modules in series at the KuPower 300W module’s V
MP
rating of 32.5V at
STC also equates to 357.5V, well within the charge controller’s 150-425V
DC
maximum power point tracking range.
3.
The charge controller’s maximum short circuit current (I
SC
) input is
33A
DC
. Temperature also
slightly affects the solar PV module’s current output: current increases as temperature increases.
However, because the temperature coefficient is negligible, it is acceptable to simply use the
module’s I
SC
rating at STC for the following calculation.
To calculate the maximum number of solar PV strings per charge controller in this example,
consider the KuPower 30
0W module’s I
SC
at STC:
9.82A
.
•
According to this calculation,
three
solar PV strings is the maximum allowable number of
strings per charge controller: 33A ÷ 9.82A = 3.4 (round down to the next whole number).
o
Although the Sol-Ark contains only two solar PV string inputs, more than two
strings in parallel can be wired to the Sol-Ark. If more than two strings are
connected in parallel to a single charge controller, each string must be fused
(refer to page 9 of the Sol-Ark-12K Manual).
o
Three solar PV strings in parallel at the KuPower 300W module’s I
MP
rating of
9.24A equates to
27.72A
at STC, above the charge controller’s operating current
input limit of 20A. Whereas two solar PV strings in parallel at the KuPower 300W
module’s I
MP
rating of 9.24A equates to
18.48A
at STC, well within the limits of
the charge controller’s operating current input limit of 20A. Therefore, wiring two
srings in parallel instead of three per charge controller will work better.
Based on calculations #2 and #3 above, a maximum three parallel strings of eleven KuPower 300W
modules in series can be wired to each of the Sol-Ark-12
K’s two charge controllers, and wiring a
maximum two parallel strings of eleven KuPower 300W modules in series to each charge controller will
eliminate power clipping.
4. The charge controller can be paired with a maximum 8,000 Watts of solar PV Wattage.
In this example, the KuPower 300W module has a Maximum Power (P
MAX
) rating of
300W
at
STC.
•
26
modules is the maximum allowable number of modules that can be paired per charge
controller: 8,000W ÷ 300W = 26.7 (round down to the next whole number).
5. The Sol-Ark-12K (with two built-in charge controllers) can be paired with a maximum 16,500
Watts of solar PV Wattage.
In this example, the KuPower 330W module has a Maximum Power (P
MAX
) rating of
300W
at
STC.
•
55
modules is the maximum allowable number of modules that can be paired per Sol-
Ark-12K: 16,500W ÷ 300W = 55.
Considering all five of the above calculations, the optimal solar module configuration in this example is
wiring a maximum
two parallel strings of eleven
KuPower 300W modules in series to each of the Sol-
Ark-12K
’s two charge controllers, for a total of 44 modules paired with the Sol-Ark-12K.
