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MSC-N series is a new generation of the solar controller with a two-way load output. The two-way load output voltage can be switched to 12V or 24V DC freely by an enable switch. According to the battery voltage, the two-way load output voltage can be turned off in stages to ensure the load1 output. The two-way load output adopts a high-efficiency buck-boost conversion circuit, which greatly reduces the invalid loss of the battery and improves the service time of the battery.
Product Model: MSC3210N
High quality and low failure rate components of ST or IR to ensure the service life;
Advanced MPPT technology & ultra-fast tracking speed guarantee tracking efficiency up to 99.5%;
Maximum DC/DC transfer efficiency up to 98.6%, full load efficiency up to 96.6 %;
Accurate recognizing and tracking technology of multi-peaks maximum power point;
Wider MPP running voltage to increase the utilization ratio of PV modules;
Support the lead-acid and lithium batteries, programmable temperature compensation;
High temperature charging automatic power reduction function;
The freely set voltage level of the two-way load output, especially suitable for voltage-sensitive loads;
Configurable cut-off voltage value for the two-way load output;
Support no-battery mode, PV array powers the load directly ①;
High-efficiency buck-boost control chip and power device, conversion efficiency up to 98.9%;
Optional charging prior mode and load prior mode;
Effectively prolong the running time of load one by the discontinuous power supply in load prior mode;
Customized the load two output according to the actual requirement;
Common negative design, used in a negative grounded system;
Real-time monitor controller by an external remote meter, BT module, Wifi module or PC software;
Comprehensive electronic protections.
PV limit Current/limit power protection
When the charging current/power of the PV array exceeds the rated charging current/power, the PV array will charge the battery as per the rated charging current/power.
PV short circuit protection
When not in the PV charging state, the controller will not be damaged in the case of a short-circuiting in the PV array.
PV reverse polarity protection
When the polarity of the PV array is reversed, the controller may not be damaged and resume normal operation after the mis-wiring is corrected.
NOTE: If the PV array is reversed and the actual power of the PV array is 1.5 times the rated power of the controller, the controller will be damaged.
Night reverse charging protection
Prevent the battery from discharging to the PV module at night.
Battery reverse protection
When the polarity of the battery is reversed, the controller may not be damaged and resume normal operation after the mis-wiring is corrected.
NOTE: Limited to the characteristic of lithium battery, when the PV array connection right and battery connection reversed, the controller will be damaged.
Battery over voltage protection
When the battery voltage reaches the over voltage disconnect voltage, the PV array will automatically stop charging the battery to prevent battery damage due to over charging.
Battery over discharging protection
When the battery voltage reaches the low voltage disconnect voltage, battery discharging will be automatically stopped to prevent battery damage due to over discharging.
Battery over heating protection
The controller detects the battery temperature through an external temperature sensor. The battery will stop working when its temperature exceeds 65 °C and will resume when its temperature is below 55 °C.
Lithium battery low temperature protection
When the temperature detected by the temperature sensor is lower than the Low Temperature Protection Threshold (LTPT), the controller will stop charging and discharging automatically. When the detected temperature is higher than the LTPT, the controller will be working automatically (The LTPT is 0 °C by default and can be set within the range of 10 ~ -40 °C).
Load short circuit protection
When the load is short-circuited, the controller will cut off the output and automatically resume the output when the short circuit is released.
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:
Charging LED is OFF during daytime when sunshine falls on PV array properly
PV array open circuit
Confirm whether the connection of PV array is correct and tight
Wire connection is correct; the controller is not working.
Battery voltage is lower than 8V
Please check the voltage of the battery(at least 8V voltage to activate the controller).
Charging indicator Green fast flashing
Battery over voltage
Check whether the battery voltage is higher than OVD (over voltage disconnect voltage), and disconnect the PV array connection.
The battery indicator is in red on solid
Battery over discharged
① Automatically restore load output after the battery is fully charged.
② Other ways recharge the battery.
Battery indicator flashes red slowly
Battery over heating
While the temperature decline to be below 55 ºC, the controller will resume.
Fault indicator on solid, PV and battery Indicators flash orange fast
Controller over heating
When the heat sink of the controller exceeds 85℃, the controller will automatically cut off the input and output circuit. When the temperature below 75℃, the controller will resume work.
System voltage error
① Check whether the current battery voltage matches the system voltage set by the controller.
② Please change a suitable battery or reset the system voltage.
Fault indicator on solid, load off.
① Please reduce the number of electric equipment.
② Restart the controller or press the button to clear faults.
Fault indicator on solid, load off.
Load short circuit
① Check carefully loads connection, clear the fault, ②Restart the controller, or press the button to clear faults.
① 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.
The following inspections and maintenance tasks are recommended at least two times per year for the best performance.
Make sure no block on airflow around the controller. Clear up any dirt and fragments on the radiator.
Check all the naked wires to make sure insulation is not damaged for sun exposure, frictional wear, dryness, insects or rats, etc. Repair or replace some wires if necessary.
Verify the indicator display is consistent with the actual operation. Pay attention to any troubleshooting or error indication. Take corrective action if necessary.
Confirm that all terminals have no corrosion, insulation damaged, high temperature or burnt/discolored sign, tighten terminal screws to the suggested torque.
Clear up dirt, nesting insects, and corrosion in time.
Replace a new surge arrester in time to avoid damaging the controller and even other equipment.
WARNING：Risk of electric shock! Make sure that all the power is turned off before the above operations, and then follow the corresponding inspections and operations.
Battery rated voltage
Rated charging current
Controller working voltage range
Max. PV open circuit voltage
92V(At 25℃ operating environment temperature)
138V(aT 25℃ operating environment temperature)
MPPT voltage range
(Battery voltage +2V)~72V
(Battery voltage +2V)~108V
Rated charging power
Max. Conversion efficiency
Full load effciency
Load 1/2 constant-voltage output voltage
Load rated power
Load 2: 36W
Load output protection voltage
Load 1 98.9%; Load 2 97.1%
Load 1 97.4%; Load 2 96.0%
Temperature compensate coeffiency
-30℃~+65℃(when the working temperature reaches 50℃, the charging power and load power will be reduced appropriately, working of full load is not supported.)