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Connecting the PV Array (DC)
PV Module Requirements
The SR Series Inverters are designed with input connector terminals for the
connection of solar modules. Models SR1500TL/2000TL/3000TL have one
connector terminal, Models SR4200TL/5000TL have two connector terminals.
Each connector terminal can be connected to a string of PV modules. A string
refers to a number of PV modules/panels connected in sequence. Each string
can feature any number of solar modules, provided the guidelines listed below
are adhered to (refer Fig. 4). Where inverters have input connector terminals
for two strings (eg SR4200TL/5000TL), each string configuration does not
have to be identical.
Wiring to the PV Module
The SR Series Inverter is equipped with PV quick connects for connecting up to
two PV strings.
GUIDELINES:
When determining the number of panels required in a PV
string, ensure the following three requirements are met:
1. To avoid damage to the SR Series Inverter, make sure the maximum
open circuit voltage (Voc) of each PV string is less than 500 Vdc
under any condition. Voltage over 500 Vdc will damage the inverter.
2. Do not exceed the maximum array short circuit/current rating marked
on the SR Series Inverter.
3. To achieve maximum energy harvest from your array, ensure that the
Vmp (voltage at maximum power) does not drop below 150 Vdc or
increase above 450 Vdc under most conditions.
To wire the PV array to the SR Series Inverter, follow these steps:
Step 1: Check that the PV generator connectors have the right polarity
and do not exceed the maximum string voltage.
Step 2: Connect the POSITIVE (+) wire from the #1 PV string to SR Series
Inverter positive (+) connect.
Step 3: Connect the NEGATIVE (–) wire from the #1 PV string to SR
Series Inverter negative (–) connect.
Step 4: Connect the Earth wire from the #1 PV string to SR Series
Inverter Earth connect.
Step 5: If necessary, repeat Step 2 and Step 4 for the #2 PV string.
Double check that the wires are in the proper locations.
Fig. 4
Fig. 5
DC Connections for a
Two-String PV Array
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