Solahart Industries Pty Ltd
1 Alan Street, Rydalmere, NSW 2116
|
PO Box 7508, Silverwater, NSW 2128
Solahart Industries Pty Ltd ABN 45 064 945 848
Ph: 02 9684 9100
| solahart.com.au
5. Electrical Installation
5.1 Installation Condition
5.1.1 Rated electrical characteristics such as Isc is within ±5% and Voc within ±3% and Pmpp within ±3%
of tolerance values at Standard Test Conditions. Standard Test Conditions:
1000W/m2 Irradiance, 25
℃
Cell Temperature and 1.5 Air Mass.
5.1.2 The IEC & UL standard maximum system voltage is 1500V. The maximum voltage of the system
must be less than the maximum certified voltage and the maximum input voltage of the inverter and of
the other electrical devices installed in the system.
The open circuit voltage of the array string needs to be calculated at the lowest expected ambient
temperature for the location. This can be done using the following formula:
Max System Voltage
≥
N x V
OC
x [ 1 + TC
VOC
x (Tmin
–
25)
N
No modules in series
V
OC
Open circuit voltage of each module (refer to product label or data sheet)
TC
VOC
Thermal coefficient of open circuit voltage for the module (refer to data sheet)
Tmin
The lowest ambient temperature
5.1.3 Connect quantity of modules that match the voltage specifications of the inverters used in system.
Modules must not be connected together to create a voltage higher than the permitted maximum system
voltage under the lowest local temperature conditions.
5.1.4 Under normal conditions, a photovoltaic module is likely to experience conditions that produce
more current and/or voltage than reported at standard test conditions. Accordingly, the value of Isc
marked on this module should be multiplied by a factor of minimum 1.25,when determining component
conductor ampacities, fuse sizes, and size of controls connected to the PV output. Refer to AS/NZS for
additional requirements.
5.1.5 Refer to AS/NZS 5033, when determining the voltage rating, conductor capacity, fuse rating, and
photovoltaic output control size.
