12 System functions
12.1
Protection functions
12.1.1 Controller overload
The controller is protected from the following faults and is not damaged when these faults occur
individually.
Q Solar module or battery or load connected with the wrong polarity
Q Solar module or battery or load incorrectly connected
Q Solar module or load short-circuited
Q Battery not connected
Once the individual fault has been corrected the controller will operate correctly without taking any
further measures.
If the battery voltage drops below 9.5 VDC, safe operation of the controller can no longer be
guaranteed. The controller stops all functions, especially charging of the battery.
12.1.2 Overheating of the controller
The cooling fins on the rear side and the internal temperature controller prevent the controller from
overheating. If the controller becomes too hot then the battery is no longer charged and the load
output is also switched off if necessary.
12.1.3 Deep discharging of the battery
To protect the battery from deep discharge the controller switches off the load output and the
‘AUX 1’ and ‘AUX 2’ relay outputs if necessary. More information on this is provided in section 14.
ATTENTION!
The following faults damage the controller:
– At least 2 of the above mentioned faults occur simultaneously.
– The load outputs of multiple controllers are connected in parallel.
– A solar module is connected to multiple controllers in parallel.
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