Specialty Concepts SC3/10) - Manual (Page 9)

HELP NOTES:
(continued)
PROBLEM CONDITIONS :
5. SYSTEM IS NOT SIZED CORRECTLY - The solar system batteries will tend to be under-
charged if the solar panel array is too small, or if the battery bank is too small, or if the
usage is too high.
6. PROBLEMS WITH SOLAR PANELS - Solar panel output is dependent upon the amount
of sun-energy reaching the panel. This can be seriously affected by panel angle of
orientation, minor shading, high level haze (barely visible) and dust or dirt on the panel. At
the time of installation, a solar array can have an incorrect series-parallel configuration for
the proper system voltage and current. A panel can also become less productive or
defective over time. TEST: To check array voltage, disconnect the ARRAY(+) connection
on the SC3/10, and measure the voltage at the array using the positive and negative
wires. In sunny conditions, this should be 18-24 volts. A lower value could indicate a
problem with the solar panel array. To check array current, contact a local solar dealer.
7. PROBLEMS WITH BATTERIES - At the time of installation, a battery bank can have an
incorrect series-parallel configuration for the proper system voltage and current. A battery
can also go bad and unable to maintain a charge. TEST: If the battery is going bad, a little
charging or discharging will cause a large change in the battery voltage.
8. BAD CONNECTION: PANEL - The panel connection to the controller may be weak or
completely out. This may include problems with the connections at the SC3/10, both panel
connections (“+” or “-”) or fuses and unsoldered crimp connectors in these lines. Also, wire
that is too small for the length of the run may cause a voltage drop.
9. BAD CONNECTION: BATTERIES - The SC3/10 needs to read an accurate battery
voltage to regulate the charging correctly. The battery connection to the controller may be
weak or completely out. Connection problems can be found with the connections at the
SC3/10, the SC3/10 fuse, both battery terminals (“+” or “-”) or other fuses and unsoldered
crimp connectors in these lines. Also, wire that is too small for the length of the run may
cause a voltage drop
10. CONTROLLER MISWIRED - This may include reversing the polarity from the panels or
batteries, or switching the array and battery connections.
11. CONTROLLER DEFECTIVE - The SC3/10 may no longer be functional. It could have
been exposed to high voltage (such as a lightning strike nearby), too much current from the
panels or reverse polarity from the batteries. Refer to SC3/10 FIELD TEST
PROCEDURE