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Important Safety Instructions
Please reserve this manual for future review.
This manual contains all the instructions of safety, installation, and operation for
DuoRacer series MPPT Dual Battery Solar Charge Controller (referred to as the con-
troller in this manual).
• Read all the instructions and warnings carefully before installation.
• No user serviceable component inside the controller. Do NOT disassemble or
attempt to repair the controller.
• Avoid direct sunlight, high temperature, and do NOT install the controller at
locations where water can get in.
• Install the controller at well-ventilated places, the controller’s heat sink may
become very hot during the system operation.
• Appropriated external fuses or breaker are suggested.
• Please cut off all connections of the PV array, fuses or breakers which close to
the battery before the controller installation and adjustment.
• Power connections must remain tight to avoid excessive overheating from
the loose connection.
Features
• Maximum Power Point Tracking technology with ultra-fast tracking speed and
the tracking efficiency is no less than 99.5% guaranteed
• Advanced MPPT control algorithm to minimize the MPPlost rate and lost time
• The wider range of the MPP operation voltage to improve the PV module utilization
• Auto control function of charging power & charging current limitation(BATT1)
• High quality and low failure rate components of ST, TI and Infineon to ensure
the product life
• Digital circuit control of adaptive three-stage charging mode to enhance BATT1 life.
• BATT1 type can be set via LED/LCD.
• Product runs into the low-power mode when there is no manual operation for
a long time, and charging conditions are not satisfied (PV<5V).
• 100% charging and discharging in operationenvironmental temperature range.
• LED and LCD dispiay units selectable.
• AES control signal for car refrigerator to avoid energy waste.
• Standard Modbus protocol, and RS485 (5V/200mA) communication port for
the customer to expand the application area.
When there is no manual operation for a long time, and the charging conditions ca-
nnot be reached, the controller will turn to low-power mode, which reduces the loss
and battery power waste to enhance the products life. The system parameters are
shown and set by LED/LCD or the MT11 remote meter (Accessory).
The AES control signal of the car refrigerator is built in the controller, which will sup-
ply the surplus solar power to the refrigerator to avoid energy waste. The controller
comes with IP33 protection level, which is waterproof and dustproof. Multiple pro-
tection features, including battery overcharge protection, over discharge protection,
and reverse connection protection of the PV and battery, which effectively ensure the
solar system safety, stability, and lifetime.
Overview
Information & Features
DuoRacer MPPT charge controller is made for charging two batteries (shown as main
battery (BATT1) and starter battery (BATT2) below) at the same time in a solar sys-
tem. This controller supports multiple main battery (BATT1) types, including Sealed,
Gel, Flooded, LiFePO4, and Li-NiCoMn, which is suitable for RV, Camper, Boat, and so
on. The device recognizes the starter battery (BATT2) system voltage automatically,
and trickle charges the battery when the conditions are satisfied.
The controller adopts the advanced MPPT control algorithm,which will minimize the
maximum power point loss rate and loss time,also fast track the maximum power po-
int(MPP) of the PV array, and obtain the maximum energy from solar array under any
conditions. The energy utilization in the MPPT solar system is increased by 20-30%
compared with PWM charging method.
