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Identificazione: MD-AL-GI-00
Rev. 4.0 del 31.01.18 - Applicazione: GID
Manual of 07/06/2019 Rev. 1.1 “User Manual for 20K-33KTL”
4.
Electrical connections
General information in this chapter
This chapter describes the electrical connections of the 20K-33K TL inverter. Carefully read this section
before connecting the cables.
NOTE:
Before making any electrical connections, ensure that the DC and AC circuit breakers are open.
Remember that the accumulated electrical charge remains in the inverter capacitor after the DC and AC
circuit breakers have been switched off. Therefore, it is necessary to wait at least 5 minutes to allow the
capacitor to discharge completely.
The inverter must be installed and serviced by professional technicians or
electricians.
Attention
The PV modules generate electricity when exposed to sunlight, which can pose
a risk of electric shock. Before connecting the DC input power cord, be sure to
disconnect the strings via the appropriate circuit breakers.
Danger
The maximum open-circuit voltage of the photovoltaic string must be less than
1000 V.
The 20K-33K TL inverters have two maximum power point markers
(MPPT);All the photovoltaic modules connected in series to the same MPPT
must be of the same model and brand so as to have the same rated electrical
characteristics (Isc, Voc, Im, Vm, Pm and temperature coefficients);they must
have the same number of photovoltaic modules connected in series and must
be positioned in the same orientation(solar azimuth and inclination angle).
Note
4.1. Electrical connections
Describes the process for making the electrical connections.
4.2. Connecting the PNGD cables (grounding)
Describes the connection of the ground cables (PGND) for the grounding of the inverter
4.3. Connecting the DC input power cables
Describes the connection of the photovoltaic strings to the inverter using the DC power cables.
4.4. Connecting the AC output power cables
Describes the connection of the inverter to the AC grid using the AC power cables (following the
granting of the grid connection by the distributor).
4.5. Connecting the communication cables
Describes the function of the RS485 ports and the Wi-Fi board and the relative connection methods.
