Check the controller
(1) Loosen the screws from the front of the controller to
access the terminal block where the wires connect.
(2) Check for a burnt smell. This will indicate a failure
of the electronics. Look for burnt wires, bits of black
debris, and any other signs of lightning damage.
(3) Inspect the grounding wires and connections. Most
controller failures are caused by an induced surge from
nearby lightning where the system is not effectively
grounded. Ground connections must be properly made
and free of corrosion.
12.4 General checklist
Check the PV generator
Make sure the PV generator is facing the sun and there is no
partial shading of the array. A partial shading of as little as
10% of the arrays’ surface can stop the pump.
Check all wires and connections
Carefully check for improper wiring (especially in a new
installation) and wiring condition. Wires are often damaged
by animals if they are not enclosed in conduit (pipe). Pull on
wires slightly to check for failed connections.
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