MARK/(15,20) PROBLEM NOTES ( Continued )
MARK/(15,20) Note 5 - The “CHARGING” light on with 00.0 amps from the array may indicate…
• A condition exists of very low levels of light to the panels
• A system problem. This would be a panel, connection or wiring problem. Often, this happens when the
negative connections from the array and battery are connected. Refer to INSTALLATION
INSTRUCTIONS, step #12: MARK/(15,20) CONNECTION (Page 7)
• The MARK/(15,20) is defective. See CONTROLLER DEFECTIVE (Help Note #13).
TEST: Perform the BATTERY FUSE REMOVAL TEST (Page 18)
MARK/(15,20) Note 6 - High voltage with the “CHARGING” light on may indicate…
• A bad connection exists to the battery. See BAD CONNECTION: BATTERY (Help Note #9).
• The charge set-point is set very high. See INCORRECT VOLTAGE SET-POINT (Help Note #11)
• The MARK/(15,20) is defective. See CONTROLLER DEFECTIVE (Help Note #13).
TEST: Perform the BATTERY FUSE REMOVAL TEST. (Page 18)
MARK/(15,20) Note 7 - The "CHARGING" light can be on (bright to dim) at night if the panels are under even very
low levels of light (moonlight or street lights). The "CHARGING" light on brightly at night may also indicate…
• The unit is mis-wired. Refer to INSTALLATION INSTRUCTIONS, step #12: MARK/(15,20) CONNECTION
(Page 7).
•• There is a blocking diode located within the solar panels or in the panel connection. This is not a serious
problem, but should be removed if possible.
• The MARK/(15,20) is defective. See CONTROLLER DEFECTIVE (Help Note #13).
TEST: Disconnect the panel (ARRAY (+)), if the light goes off, then it may be possible that the panel is receiving
enough light for a slight charge, or a diode exists in the connection.
MARK/(15,20) Note 8 – The display readings and status lights changing rapidly may indicate…
• A normal condition. If the battery is fully charged and the array has a lot of additional charge current, the
controller can pulse on and off rapidly, especially when current is being used by a load. This is OK.
• A bad connection exists to the battery. See BAD CONNECTION: BATTERY (Help Note #9).
• A problem exists with the battery. The battery bank is bad or too small. See PROBLEMS WITH
BATTERIES (Help Note #7)
TEST: Take an accurate voltage reading at the battery. If this voltage reading stays steady while the reading
on the MARK/(15,20) goes up and down, then suspect a bad battery connection. If the voltage here also
moves up and down rapidly, this would indicate either a normal condition or a battery problem.
MARK/(15,20) Note 9 - A bad display readings may indicate…(display issues don’t affect the charging functions)
• System noise. Digits is OK, but the readouts are erratic. See SYSTEM NOISE (Help Note #12)
• A Defective unit. Digits is OK, erratic readouts and a correlation to high humidity exists.
• A Defective unit. If the quality of the digits are bad with missing segments or black background areas.
MARK/(15,20) Note 10 - A voltage reading that is a lot higher than the actual battery voltage is caused by a bad
battery connection. Somewhere it could be corroded or loose. If you rechecked at night or disconnect the
panel, the difference should go away. See BAD CONNECTION: BATTERY (Help Note #9).
MARK/(15,20) Note 11 - If the charge current seems too low for your panels, refer to SOLAR PANEL
PROBLEMS section (Page 18). Also, check to see that there is not an alternative path from the solar panel
negative to the battery negative other than through the MARK/(15,20).
MARK/(15,20) Note 12 - The charge control circuit will reset when power is removed. Touching or removing the
battery fuse will momentarily lose power to the control circuit, causing it to reset. It will usually reset
“CHARGING”. This is normal and does not indicate a problem.
MARK/(15,20) Note 13 - The buzzing sound is caused by the controller rapidly switching on and off and is
caused by a bad battery connection. See BAD CONNECTION: BATTERY (Help Note #9).
MARK/(15,20) Note 14 - The MARK/(15,20) may get warm during normal operation. When operating near
maximum ratings, the front plate gets very warm. If the unit should get too hot to touch, it may be defective. See
CONTROLLER DEFECTIVE (Help Note #13).
MARK/(15,20) Note 15 – If the bar-graph goes off, confirm that the slide switch is set to the top position. Also,
look at the battery voltage. If it is below 10.5 volts, the bar-graph will not light.
MARK/(15,20) Note 16 – If the fuses continuously blow, refer to ARRAY & BATTERY FUSE section (Page 10).
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