SOLAR CONTROLLER
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12
© 2020 Go Power!
Why does the voltage fluctuate so much when charging with the LITHIUM
setting?
Lithium batteries contain smaller battery cells. The voltages of these individual
cells must be balanced during the charging process by the Battery Management
System (BMS). Imbalances will cause fluctuations in the battery voltage
measurement, but this will stabilize as the cells are charged and balanced.
Additionally, lithium batteries have higher resistance than lead acid batteries.
This affects the charge controller’s battery voltage measurements and its
compensation for wire resistance.
Reduce wire inductance which may also cause voltage fluctuations. Keep battery
wires close together, or gently twist positive and negative wires together.
9.0
Troubleshooting Problems
How to Read this Section
Troubleshooting Problems
is split into three sub-sections, grouped by symptoms
involving key components. A multimeter or voltmeter may be required for some
procedures listed.
It is imperative all electrical precautions stated in the Warning Section and
outlined in the Installation Section are followed. Even if it appears the system is
not functioning, it should be treated as a fully functioning system generating live
power.
9.1
Problems with the Display
Display Reading:
Blank
Time of Day:
Daytime/Nighttime
Possible Causes:
Battery or fuse connection and/or solar array connection
(Daytime only) or battery or fuse connection (Nighttime only).
How to tell:
Check the voltage at the controller battery terminals with a voltmeter and
compare with a voltage reading at the battery terminals.
If there is no voltage reading at the controller battery terminals, the problem could
be a fuse, or the wiring between the battery and the controller. If the battery
voltage is lower than 6 volts the controller will not function.
For the solar array, repeat steps 1 and 2 substituting all battery terminals with
solar array terminals.
Remedy: