MPPT Solar Controller

With the advanced dual-peak or multi-peak tracking technology, when the solar panel is shadowed or part of the panel fails resulting in
multiple peaks on the I-V curve, the controller is still able to accurately track the maximum power point.
A built-in maximum power point tracking algorithm can significantly improve the energy utilization efficiency of photovoltaic systems,
and raise the charging efficiency by 15% to 20% compared with the conventional PWM method.
A combination of multiple tracking algorithms enables accurate tracking of the optimum working point on the I-V curve in an extremely short time.
The product boasts an optimum MPPT tracking efficiency of up to 99.9%.
Advanced digital power supply technologies raise the circuit’s energy conversion efficiency to as high as 98%.
Charging program options are available for different types of batteries including gel batteries, sealed batteries, open batteries, lithium
batteries, etc.
The controller features a limited current charging mode. When the solar panel power exceeds a certain level and the charging current is
larger than the rated current, the controller will automatically lower the charging power and bring the charging current to the rated level.
Instantaneous large current startup of capacitive loads is supported.
Automatic recognition of battery voltage is supported.
LED fault indicators and an LCD screen which can display abnormality information help users to quickly identify system faults.
Historical data storage function is available, and data can be stored for up to a year.
The controller is equipped with an LCD screen with which users can not only check device operating data and statuses, but also modify
controller parameters.
The controller supports standard Modbus protocol, fulfilling the communication needs of various occasions.
The controller employs a built-in over-temperature protection mechanism. When temperature surpasses the set value, the charging
current will decline in linear proportion to the temperature so as to curb the temperature rise of the controller, effectively keeping the
controller from being damaged by overheat.
Featuring a temperature compensation function, the controller can automatically adjust charging and discharging parameters in order to extend the battery’s service life.
TVS lighting protection.

Product Details:

Electric Parameters

Parameter Value
Model MT2420 MT2430 MT2440
System voltage 12V/24VAuto
No-load loss 0.7 W to 1.2W
Battery voltage 9V to 35V
Max. solar input voltage 100V(25℃) 90V(-25℃)
Max. power point voltage range Battery Voltage+2V to 75V
Rated charging current 20A 30A 40A
Rated load current 20A
Max. capacitive load


Max. photovoltaic system input power 260W/12V






Conversion efficiency ≤98%
MPPT tracking efficiency >99%

compensation factor

Operating temperature -35℃  to +45℃
Protection degree IP32
Weight 1.4Kg 2Kg 2Kg
Communication method RS232
Altitude ≤ 3000m
Product dimensions 210*151*59.5mm 238*173*72.5mm 238*173*72.5mm

Battery Type Default Parameters (parameters set in monitor software)

Parameters cross-reference table for different types of batteries
Voltage to set

Battery type

Sealed lead-acid


Gel lead-acid


Open lead-acid battery User (self-customized)
Over-voltage cut-off


16.0V 16.0V 16.0V 9~17V
Equalizing voltage 14.6V —— 14.8V 9~17V
Boost voltage 14.4V 14.2V 14.6V 9~17V
Floating charging


13.8V 13.8V 13.8V 9~17V
Boost return voltage 13.2V 13.2V 13.2V 9~17V
Low-voltage cut-off

return voltage

12.6V 12.6V 12.6V 9~17V
Under-voltage warning

return voltage

12.2V 12.2V 12.2V 9~17V
Under-voltage warning


12.0V 12.0V 12.0V 9~17V
Low-voltage cut-off


11.1V 11.1V 11.1V 9~17V
Discharging limit voltage 10.6V 10.6V 10.6V 9~17V
Over-discharge time


5s 5s 5s 1~30s
Equalizing charging


120minutes —— 120minutes 0~600minutes

Equalizing charging interval








(0 means the equalizing charging function is disabled)

Boost charging duration 120minutes 120minutes 120minutes 10~600minutes

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