Dulas Solar VC150, Handbook

Page: 91 / 156

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8.If the solar array short circuit current or open current voltage does not appear
correct then there may be a fault with a module or the way the modules are
connected together.
9.Measure the open circuit voltage and short circuit current in each module with each
module disconnected from the other modules.
10.If the voltage and current measured on one module is not similar, to other
modules (more than 15% different) the module is probably faulty and should be
replaced.
11. If the voltage and current of all the modules are similar then there was probably a
poor connection on one module or faulty wire.
Repair action required
1.If a module is faulty (replace it as described on page 82)
2.If a wiring fault or connection fault between modules is suspected check the
electrical continuity of each wire and clean all the wire terminals.
3.Reconnect all the modules to the array and check all connections are correct.
Typical wiring for 1 12-volt system is shown below.
4.
Check the output of the solar array again to confirm that the correct array
current is approximately equal to the current of one module times the number of
modules and hence is correctly connected.