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1. Product Introduction
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1.1 Product overview
Based on multi-phase synchronous rectification technology and advanced MPPT control algorithm,
the MD Series MPPT DC charge controller for solar energy and generator adopts fully digital and
intelligent design. Thus, it achieves advantages such as great response speed and reliability and
reaches high industrialization standards. The multi-phase synchronous rectification technology ensures
super conversion efficiency at any charging power, significantly improving the energy utilization of the
system. The PowerCatcher maximum power point tracking technology leads the industry and achieves
the maximum energy tracking of solar panels. That makes it possible for the panel to rapidly and
precisely track the maximum power point of solar battery in any condition and obtain the maximum
energy of solar panels in real-time.
The product belongs to the DC/DC intelligent charger that applies to vehicle or ship systems. It is
applied to a dual battery system integrating the respective advantages of generator and photovoltaic
power generation. In this case, the system adopts the combination of charging methods with ingenious
design, which effectively ensures enough power at any time. The backup battery could be charged by
either or both of the solar energy and generator.
1.4 Introduction of maximum power point tracking
The MPPT (Maximum Power Point Tracking) system is an advanced charging technology, which
achieves more energy output from the solar batteries by adjusting the operating state of the electrical
modules. Due to the nonlinearity of the solar battery array, there is a maximum energy output point
(maximum power point) on its curve. The traditional controller (switching charging technology and
PWM charging technology) cannot charge the battery continuously at the point, so it cannot obtain the
maximum energy of the solar panel. Instead, the solar controller with MPPT can always track the
maximum power point of the array, so as to charge the battery with the maximum energy. For
example, for the 12V solar system, since the peak-to-peak voltage (Vpp) of the solar battery is about
17V, while the battery voltage is about 12V, therefore, when the charge controller is charging the
battery, the voltage of the solar battery is generally about 12V, that is, the solar battery does not fully
exert its maximum power. The MPPT controller can overcome the problem. It could adjust the input
voltage and current of the solar panel in real-time to reach the maximum input power. Compared with
the traditional PWM controller, the MPPT controller can exert the maximum power of the solar battery,
so it can provide a larger charging current. Generally, the MPPT controller can improve the energy
utilization rate by 15%~20% more than the PWM controller.
Applied with the PowerCatcher maximum power point tracking technology, the controller could still
track the maximum power point of the solar battery in complex conditions. Compared with traditional
MPPT technology, it has better response speed and tracking efficiency, and its efficiency could reach
up to 99.9%.
Applied with the design of multi-phase synchronous rectification for step-up/down circuitry, the
controller owns great DC/DC conversion efficiency whether in high/low power, which could reach up to
98%.
Various types of backup batteries are supported such as sealed, gel, flooded, lithium, and custom.
Various types of generators are supported such as intelligent and traditional generators, and the
controller could automatically identify the generator types by the ignition signal.
Applied with various charging modes such as photovoltaic charging the backup battery individually,
generator charging the backup battery individually, and photovoltaic and generator charging the backup
battery at the same time.
Applied with cable drop compensation for charging voltage of the backup battery, so that the controller
controls the charging voltage in a more accurate way.
Applied with temperature sampling for the backup battery, and temperature compensation for the
lead-acid battery, effectively extending the service life of batteries.
Applied with automatic derating while charging in high temperature.
Applied with TTL communication, providing technical support of communication protocol to facilitate
applications for secondary development.
The parameters could be monitored and set via mobile APP and PC monitoring and setting
applications.
Applied with potting of smidahk, the controller has IP65 grade of protection, which ensures reliable
and efficient operation in various working conditions.
Applied with high-quality aluminum radiator and high-temperature derating technology, which ensures
reliable and efficient operation in various working conditions.
1.2 Product features
1. The solar battery, generator (startup battery), and backup battery adopt the common negative pole
design.
2. See the description below for the definitions of the indicator light and interface, button function,
interface description, etc.
No. Name
1LED indicator light
2TTL communication interface
3 CAN and RS485
communication interfaces
4Voltage sampling interface for
backup battery
5Temperature sampling interface for
backup battery
6Ignition signal interface
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8
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No. Name
Operating button
Positive interface for solar battery
Positive interface for generator
(startup battery)
Common negative interface
Positive interface for backup battery
fixed hole
1.3 Interface description
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