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JN-MPPT-B 12v 24v 48v auto volt 30a 40a 50a 60a PV solar charge controller

JN-MPPT-B Solar controller series ranked the first place among MPPT solar charge controllers, the advantage includes high conversion efficiency, wide range of PV input, professional PC monitoring software etc.. This is the most advanced version of MPPT solar charge controller.

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  • Rated Voltage:

    12v 24v 48v auto
  • size:

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  • charging current:

    30A 40A 50A 60
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Product Detail

Products brief

This series of mppt solar charging controllers are based on polyphase synchronous rectifier technology and sharing-one-cathode design. Adopting the advanced dual core processor architecture and MPPT control algorithm, it has features such as high response speed, high reliability and high standard of industrialization etc.

With the MPPT control algorithm, JN-MPPT series can quickly track the maximum power point of pv array and get real-time access to the biggest energy of solar panels in any environment.  With polyphase synchronous rectifier technology, JN-MPPT series are guaranteed to keep a high conversion efficiency in any charging power environment. Compared with most of the buck mppt solar charge controller,  JN-MPPT series raise the utilization ratio of  the solar system largely. Besides, with standard RS485 communication interface which for option, JN-MPPT series can easily realize multiple devices in parallel, to the greatest extent, to meet the demand of different monitoring function. It can be widely used in communication station, household system, street lamp system and field monitoring system etc.

With comprehensive electronic fault self-test function and powerful electronic protection function, JN-MPPT series can avoid system components damage in the greatest degree due to installation errors.


Product features

• Advanced MPPT maximum power point tracking  technology, and tracing efficiency not less than 99.5%. Compared to common PWM algorithm, it achieves 15% -20% more efficiency.

• Using high quality imported components and advanced power conversion circuit, the maximum conversion efficiency can reach more than 98%; full-load efficiency can reach 97%.

• Aluminum metal for structure, JN-MPPT series solar battery charge controller mppt can be used in all kinds of harsh conditions.

• R&D with the latest  technology,  JN-MPPT series can realize the multiple devices in parallel through the RS485 communication interface.

• With Polyphase synchronous rectifier technology, JN-MPPT series can achieve high conversion efficiency even in low power charging environment.

• Combination of various tracking algorithm, JN-MPPT series can track the maximum power point quickly.

• Dual wave and multiple wave tracking technology, when the panels are in partial shade or when a single panel is damaged, JN-MPPT series can still track the maximum power point accurately.

• Four sections of charging ways: MPPT charge- equalizing charge- improving charge- floating charge.

• 12/24/48 V automatic identification function.

• Support for data storage, storage time can be up to 10 years.

• With current-limiting charging mode, when the input power of the photovoltaic panels is too large, the charging current exceeds the rated current of the controller. The controller will limit the charging current to the rated current charge.

• With internal temperature detection function, when the controller temperature rises to 75 degrees, the controller will limit the charging current to half of the rated current. When the temperature reaches 90 degrees, the controller will shut down of charging and output to control the temperature.

• Through the RS485 communication interface, controller can be connected  to the upper machine.  You can set up monitoring and control parameters etc from the upper machine.

• The battery temperature compensation function.

• With a wide range of  operating voltage of pv array maximum power point.

• With over charge, over discharge, over temperature, over load and reverse connection protection functions.

. Product Properties

1.  MPPT charging technology

 MPPT technology (Maximum Power Point Tracking, MPPT for short) is the technology which can adjust the working state of the electrical module to assure photovoltaic panels output more electricity Power.  Direct current (dc) from the solar panels can be able to stored in the battery effectively, which can solve the lack of  life and industrial electricity in the remote areas or tourist areas where regular Power grid can’t cover. The output power of photovoltaic battery is associated with the working voltage of the MPPT controller. Only when the controller works in the most appropriate voltages, will photovoltaic battery output  reach the only maximum.

12v system, for example, under the 25 temperature, the peak voltage (Vpp) of solar panels is about 17v. When the weather gets very hot, Vpp turns to 15v and when the weather gets cold, Vpp turns to 18v. Since battery voltage keeps at about 12v, charging by common charge controller, the solar panel voltage is 12v which can not reach the maximum power. However, MPPT controller can overcome this problem by constantly adjusting the input voltage and current of the panels. 

Compared to traditional PWM controller, the MPPT controller can assure the maximum power of  solar panels, can provide higher charging current to the battery. Generally, MPPT can improve the utilization rate of  the energy by 15% ~ 20% (due to the influence of the environment and all kinds of energy losses, concrete numerical value is likely to change).

MPPT dc solar charge controller

Picture 1  MPPT maximum power point tracking curve
Due to different light conditions and temperature, the power of photovoltaic panels will have corresponding change. MPPT will monitor the working state of the solar panels and adjust the parameters constantly to keep the system working in the maximum power point.

MPPT solar charge controller working     solar cell charge controller

A. As  light is reduced, current decreases    B. As temperature increases,  the open circuit  voltage decreases

Picture 2  Solar panels changes with light and temperature curve


2. Charging status explaination

As one charging phase, MPPT charge cannot be used alone but need combining with improving charge, floating charge and equalizing charge methods. When the controller starts to work, it will estimates battery voltage. If the battery voltage is higher than “ascension back charge voltage”, the controller judges that the battery is full and goes straight to the floating charge. If the battery voltage is lower than the “ascension back charge voltage”,  the charging process should be MPPT, (equalizing charge), improving charge and floating charge. And a improving charge happens during every charge. Charging curve as follows:

A. MPPT charge

The stage for rapid charging.

The controller will be MPPT charging to provide the biggest solar power to the battery till the battery charging voltage is up to “ascension back charge voltage”. When the battery voltage reaches improving charge voltage, controller turns to improving charge.


B. Improving charge

When the battery voltage reaches improving charging voltage, the controller will be converted to constant voltage charging mode. In this process, the controller will not be MPPT charging and the charging current will decline gradually over time. Under the condition of improving charge time up to  the set time (1, 2, 3 hours), the controllerwill convert into floating charge. And when the battery voltage is less than “ascension back charge voltage”, the controller will be improving charge again.

C. Floating charge

Controller will be improvingcharge again. When improving charge is finished, the controller will reduce the charging current in order to reduce the battery voltage and keep it matched with the floating charge voltage. During Floating charge stage, there is very weak battery charging, which can  ensure the battery to maintain in full-energy state. In this stage, load can get nearly all of the solar power. But if the load exceeds the electricity that solar energy system can provide, the controller will not be able to keep the battery voltage matched with the floating charge voltage. When the battery voltage reduces to “improving back charge voltage”, the controller system will exit the floating charge stage and back to the quick charge stage (MPPT charge).

D. Equalizing charge

Benefit from Equalizing charge, some types of battery can stir electrolyte to balance the battery voltage and complete the chemical reaction. By Equalizing charge,  the battery voltage can be increased to higher than the standard voltage, which can make the electrolyte gasified. Once there is a battery discharge, the controller will conduct a balanced charge.

Product parameters

1. System parameters table

Notes: The following parameters are based on the 12V,"n"represents the integer multiple of the 12V (2, 4)

Parameters Name

The parameter values (and adjustable range)

Default values







System Voltage



Photovoltaic max input voltage

100V (12V system Voltage)

150Vsuggest lower than 145V(24Vsystem Voltage)

150Vsuggest lower than 145V(48Vsystem Voltage)


Rated working current






Photovoltaic max input power














MPPT efficiency







Over voltage (over charge)



Over voltage recovery

1515.5V, ×nV


Charging limit voltage

 15.516V, ×nV


Equalizing charge voltage

1515.5V, ×nV


Boost charge voltage

1415V, ×nV


Boost charge recovery



      Floating charge voltage



Over discharge voltage



Over discharge  recovery



Equalizing charge time

1/2/3 hour


Boost charge time

1/2/3 hour


Device address



Light control OPEN voltage



Light control CLOSE voltage



Light control

time delay

10 min


Temperature compensation



Over temperature protection

When the temperature reaches 75 charging current is limited to half of the rated current, When the temperature reaches 90 charging and load are shut off


Working temperature



Storage temperature




10% 90% Non-condensate








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