Epever DuoRacer 20A Charge Controller

is an innovative charge controller designed for photovoltaic systems in vehicles such as caravans, campers, and boats. This device provides advanced charging management for two batteries—the main battery (BATT1) and the auxiliary or starter battery (BATT2), making it an excellent choice for anyone needing a reliable and efficient vehicle battery charging solution. Thanks to its technology, MPPT (Maximum Power Point Tracking), the controller maximizes the use of energy from the solar panels by tracking the fastest possible maximum power point and achieving tracking efficiency of no less than 99.5%. This ensures the highest level of charging efficiency, regardless of weather conditions.
One of the unique features Epever DuoRacer is its ability to charge the trickle starter battery (BATT2) while simultaneously charging the main battery, which increases system reliability. This is especially important in vehicles, where maintaining the full functionality of the starter battery is crucial for daily operation. The device supports three-stage adaptive charging, ensuring optimal battery charging, and digital control allows for precise adjustment of parameters to the system's needs. The regulator Epever DuoRacer 20 A It has been designed to be easy and quick to install, while ensuring maximum functionality.

Advanced Technologies and Ease of Use

Regulator Epever DuoRacer 20 A is a device with unique functionality, which is equipped with LCD display, enabling a quick and intuitive view of all key operating parameters. This allows the user to check the battery charging status and solar panel efficiency at any time. Furthermore, thanks to the wide MPP operating voltage range, the controller is able to better utilize the energy from the photovoltaic modules, which translates into even higher efficiency. charging power limits and the charging current for the main battery additionally increases the safety of use, preventing overcharging of the batteries and ensuring their longevity.
Epever DuoRacer 20 A is equipped with technology MPPT, which allows the controller to automatically adjust to current weather conditions, maximizing the amount of energy obtained from the solar panels. This ensures that the system operates efficiently even on cloudy days, and battery charging is efficient. The device also operates in low-power mode, which is particularly useful when the PV voltage drops below 5V – the controller then automatically switches to energy-saving mode, minimizing its consumption. This intelligent solution ensures that the solar system operates efficiently at all times and optimally extends battery life.

Technical Specifications

• Nominal voltage BATT1: 12/24VDC


• Nominal voltage BATT2: 12/24VDC/Auto


• Highest charging current BATT1: 20A


• Highest charging current BATT2: 1A


• Battery input voltage range: 8.5～32V


• Maximum PV open circuit voltage: 100V (at minimum ambient temperature), 92V (at ambient temperature 25°C)


• MPPT voltage range: (2V above battery voltage) to 72V


• Nominal charging power: 260W/12V, 520W/24V


• Maximum conversion efficiency: 97.50%


• Efficiency at full load: 96%


• Self-consumption: 26mA/12V, 15mA/24V, 19mA/12V, 10mA/24V (power saving mode)


• Temperature compensation: —3mV/ /2V (default)


• Ground: common negative


• Full voltage BATT2: 13.8V/12V, 27.6V/24V (default)


• BATT2 charge return voltage: 13V/12V, 26V/24V (default)

Environmental parameters

• Operating temperature range: -20 ～+45 (DDS), -30 ～+45 (DDB)


• Case: IP33

Mechanical parameters

• Dimensions (mm): 243.7×158×63


• Net weight: 1.1kg

This innovative solution for off-grid photovoltaic systems ensures efficient and safe charging of two batteries. Thanks to MPPT technology and an adaptive charging system, the device offers the highest energy efficiency, even in changing weather conditions. Its advanced features, such as trickle charging for the starter battery and charging power limitation, make it an ideal product for all owners of RVs, boats, and other off-grid systems. Epever's high-quality build and reliability make this regulator an excellent choice for years of use.