Specialty Concepts SC3/15 - Manual (Page 16)

SC3/15 PROBLEM NOTES (from SC3/15 PROBLEMS chart)
SC3/15 Note 1 - During the day, no voltage on the voltage meter would suggest one of the following:
•
A bad connection exists to both the battery and the solar panel (perhaps the black wire of the
SC3/15). (See BAD CONNECTION: PANEL (Help Note #9) and BAD CONNECTION: BATTERY
(Help Note #10))
•
The SC3/15 is defective.
SC3/15 Note 2
- At night only, no voltage on the voltage meter would suggest one of the following:
•
The battery may not be connected. (See BAD CONNECTION: BATTERY (Help Note #10)).
•
A blocking diode or diode isolator exists in the battery connection (red wire line). If there is a blocking
diode, remove it. If there is a diode isolator, modify the system so the SC3/15 charges only one
battery bank.
•
The SC3/15 is defective.
SC3/15 Note 3
- A low voltage condition with no daytime charging would indicate one of the following:
•
The panels are not connected (See BAD CONNECTION: PANEL (Help Note #9))
•
The batteries are not connected (See BAD CONNECTION: BATTERIES (Help Note #9))
•
The SC3/15 is defective.
TEST: - Perform the FUSE REMOVAL TEST (above). If the voltage drops to zero (“9” on meter),
there is either a bad panel connection or the unit is defective. If the volt meter remains unchanged,
then the batteries may have a connection problem.
SC3/15 Note 4 - A meter showing high voltage would indicate one of the following:
•
The batteries could be charged from another source. If so, add charge regulation to second source.
•
The voltage meter reads a little high. See METER ACCURACY (Help Note #5),
•
The battery may not be connected. See BAD CONNECTION: BATTERY (Help Note #10)
•
The voltage set-point is too high (UNIT OUT OF CALIBRATION (Help Note #12)), or the unit is
defective.
TEST: Perform the FUSE REMOVAL TEST (above). If the meter remains unchanged, this suggests
there is a problem with the battery connection. If the meter goes to the right, and the actual battery
voltage does not exceed 14.7 volts, this would indicate that the unit is functional but the volt meter
was a little off. If the meter moves to the right and the actual battery voltage exceeds 14.7 volts,
this would indicate that the unit is out of calibration or the unit is defective.
SC3/15 Note 5 - A voltage reading that was less than the actual battery voltage would be a result of
the meter reading a little low. See METER ACCURACY (Help Note #5).
SC3/15 Note 6 - A voltage reading that was higher than the actual battery voltage would be a result
of one of the following:
•
The voltage meter reads a little high. See METER ACCURACY (Help Note #5),
•
A poor battery connection exists. See BAD CONNECTION: BATTERY (Help Note #10). The battery
connection problem would be in the nature of corrosion, or a loose connection.
TEST: Check the system at night or disconnect the array(+)(yellow) wire. If the voltage difference
continues, then consider the problem a slightly off meter. If the difference goes away, suspect a
bad connection or corrosion in the battery connection.
SC3/15 Note 7 - Erratic voltage readings are caused by SYSTEM NOISE (Help Note #13)