If the load current exceeds 1.05 times the controller's rating
current, the controller will cut off the output after 30 seconds
delay. In case of overload, the controller is restarted at
intervals of 5 seconds, 10 seconds, 15 seconds, 20
seconds, 25 seconds, 30 seconds and 1 hour until the
power of all the loads is reduced to the rated power.
Device over heating
protection
An internal temperature sensor can detect the internal
temperature of the controller. The controller stops working
when the internal temperature exceeds 85 °C and resume
work when the internal temperature is below 75 °C.
TVS high voltage
transients
protection
The internal circuitry of the controller is designed with
Transient Voltage Suppressors (TVS), which can only
protect against high-voltage surge pulses with less energy.
If the controller is to be used in an area with frequent
lightning strikes, it is recommended to install an external
surge arrester.
When the internal temperature of the controller reaches 81℃, the charging power automatic reduction
function will be enabled. Every increase of one ℃, the charging power will be reduced by 5%, 10%, 20%,
and 40%. If the internal temperature is higher than 85℃, the controller will stop charging the battery.
When the internal temperature of the controller declines to 75 ºC or lower, the controller will resume.
For example MSC4215N 24V system:
4.2 Troubleshooting
Charging LED is
OFF during daytime
Confirm whether the connection of
PV array is correct and tight
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