Installation Manual: 22.8kWh

SimpliPhi Power, Inc. | 3100 Camino Del Sol | Oxnard, CA 93030, USA | [phone] | [e-mail] | SimpliPhiPower.com
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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 300W 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 strings 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-12K’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 are 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 are 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.
REV20210319