6
The two-MPPT design has the benefit of increasing the power generating
efficiency of the whole PV system. The inverter has 2 MPPTs, so a separate
array can be controlled by an independent Maximum Power Point Tracking
(MPPT) control circuit. This means that the two arrays can be installed in
different positions and orientations.
The transformerless design of inverter with the benefit of small size, light
weight and high power density, provides the best cost performance for the
whole PV system.
The inverter is available for both indoor and outdoor applications due to its
NEMA 3R (IP65) protection class enclosure.
Integrated AFCI (Arc Fault Circuit Interruption) feature enables the need
to meet advanced local electrical and grid codes. This feature is disabled by
default but can be enabled if needed in the field. Please contact CPS at
HOTLINE: 855-584-7168 number to get instructions.
The integrated DC and AC switches make the maintenance more flexible
and safer. Besides, the inverter has the function to support one or two
independent MPPTs input to improve the system efficiency. Meanwhile, the
inverter can automatically identify the connection way between PV modules
due to its excellent self-adaption ability.
2.4 Circuit structure design
The basic schematic diagram of CPS SC20KTL-DO/US-480 &
SC14KTL-DO is shown in Figure 2-2. The input DC passes through surge
protection circuitry, AFD circuit，DC EMI filter, and the boost circuit to achieve
maximum power tracking and boost up voltages. The arc-fault detection (AFD)
is a device that can provide arcing protection for the PV system and wiring
against the unwanted effects of arcing by enabling an interruption or shorting
device to interrupt power delivered to an arcing fault. The inverter converts the
DC energy to 3-phase AC energy. The high frequency components of AC
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