Ningbo XiaoYang Science and Technology Co., Ltd.
Dual-peak or multi-peak MPPT Solar Charge Controlle(SR-ML2420)

Dual-peak or multi-peak MPPT Solar Charge Controlle(SR-ML2420)


◆ 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.

Dual-peak or multi-peak MPPT Solar Charge Controlle(SR-ML2420) parameters

Parameters Value
Model ML2420 ML2430 ML2440
System voltage 12V/24VAuto
No-load loss 0.7 W to 1.2W
Battery voltage 9V to 3
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. capeacitive load capacity 10000uF
Max. photovoltaic system input power 260W/12V
Conversion efficiency ≤98%
MPPT tracking efficiency >99%
Temperature compensation factor -3mv/℃/2V(default)
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



Parameters cross-reference table for different types of batteries
Voltage to set
Battery type
Sealed lead-acid
Gel lead-acid
Open lead-acid
User (self-customized)
Over-voltage cut-off voltage 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 voltage 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 voltage 12.0V 12.0V 12.0V 9~17V
Low-voltage cut-off voltage 11.1V 11.1V 11.1V 9~17V
Discharging limit voltage 10.6V 10.6V 10.6V 9~17V
Over-discharge time delay 5s 5s 5s 1~30s
Equalizing charging duration 120minutes - 120minutes 0~600minutes
Equalizing charging interval 30days 0days 30days 0~250D
(0 means the equalizing
charging function is disabled)
Boost charging duration 120minutes 120minutes 120minutes 10~600minutes


When selecting User, the battery type is to be self-customized, and in this case, the default system voltage parameters are consistent with those of the sealed lead-acid battery. When modifying battery charging and discharging parameters, the following rule must be followed:

• Over-voltage cut-off voltage> Charging limit voltage ≥ Equalizing voltage ≥ Boost voltage ≥ Floating charging voltage > Boost return voltage;

• Over-voltage cut-off voltage > Over-voltage cut-off return voltage;
• Low-voltage cut-off return voltage > Low-voltage cut-off voltage ≥ Discharging limit voltage;

• Under-voltage warning return voltage > Under-voltage warning voltage ≥ Discharging limit voltage;

• Boost return voltage > Low-voltage cut-off return voltage.

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