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Reminder: a solar charge controller makes power
In most cases the system is working as designed but the owner doesn't know it.
because no power is being demanded
If no power is demanded then no power is produced. This can happen when
- the batteries are full, or
- you are using a charge-and-stop Lithium profile that is in the stopped phase. This seems to catch Renology users by surprise most often.
charge-and-stop
Charge-and-stop usually charges to 14.2v or 14.4v then stops until nank voltage drops to 13.2v before restarting Bulk charging. This occurs because charge-and-stop does not use a Float setpoint.((Li doesn't need Floating in the lead-acid sense, but it can still be useful.))
Under very light loads this would result in cycling between 90% and 100% state of charge. Because of voltage sag heavy loads might result in cycling between 95% - 100%.
If this is undesirable behavior you can set up a USER profile with whatever setpoints you wish (suggested settings).
because the panels aren't receiving full sunlight
- partial shade is a killer
- rainclouds
- inside a parking garage or under a tree, etc
because the BMS has shut down charging
...because of temperature extremes of excessive charging voltage. (lithium only)
because something has actually gone wrong
It's rare, but sometimes things happen. Fuses pop. Branches reach under and disconnect solar cables Parts fail.