Overview
This MPPT solar charge controller is designed for off-grid PV systems and supports 12V/24VDC auto system voltage with 20A, 30A, or 40A charging current options. It monitors solar output and tracks the highest voltage/current (VI) in real time to charge batteries at maximum power, coordinating operation between the solar panel, battery, and load.
An LCD interface supports dynamic display of operating status, parameters, logs, and control settings, with keypad control for parameter checking and adjustment. The controller supports standard Modbus communication protocol for parameter monitoring and configuration, and includes electronic fault self-detection and protection functions to reduce risk from installation errors or system faults.
For selection support or system matching advice, contact customer service at https://tsolar.top/ or service@tsolar.top.
Key Features
- MPPT algorithm improves PV energy utilization; charging efficiency stated as 15% to 20% higher than conventional PWM.
- MPPT tracking efficiency: stated as up to 99.9%; specification table lists > 99%.
- Conversion efficiency: ≤ 98% (advanced digital power supply technology).
- Charging program options for gel, sealed, open, and lithium batteries.
- LCD screen plus LED fault indicators for fault identification; abnormality information display supported.
- Historical data storage up to 1 year.
- Over-temperature protection: charging current decreases linearly with temperature when above a set value.
- Temperature compensation function to automatically adjust charging/discharging parameters.
Specifications
| Model (rated charging current) | 20A | 30A | 40A |
| System voltage | 12V/24V Auto | ||
| No-load loss | 0.7 W to 1.2W | ||
| Battery voltage | 9 to 35 | ||
| Max. solar input voltage | 100V (25°C), 90V (-25°C) | ||
| Max. power point voltage range | Battery voltage +2V to 75V | ||
| Rated load current | 20A | ||
| Max. capacitive load capacity | 10000uF | ||
| Max. photovoltaic system input power | 260W/ 12V; 520W/ 24V | 400W/ 12V; 800W/ 24V | 550W/ 12V; 1100W/ 24V |
| Conversion efficiency | ≤ 98% | ||
| MPPT tracking efficiency | > 99% | ||
| Temperature compensation factor | -3.0mV/ °C/ 2V (default) | ||
| Operating temperature | -35°C to +45°C | ||
| Protection degree | IP32 | ||
| Weight | 1.4kg | 2kg | 2kg |
| Communication method | RS232 | ||
| Altitude | ≤ 3000m | ||
| Product dimensions | 210*151*59.5 mm | 238*173*72.5 | 238*173*72.5 |
Meter / Display (RM-5)
Meter: RM-5, LCD display. The RM-5 uses a 128*64 LCD with numeric and graphical menus, can display up to 10 parameters and states, and supports reading historical data of a certain day.
- BLE4.0 for pairing with a mobile app (optional).
- Two indicator lights for controller abnormalities and communication errors.
- Voice alarm function (switchable on/off).
- Backlight time setting.
- Functions include live data/status monitoring, on/off switching, clearing historical data, and restoring factory settings.
- Modbus protocol support; standard RJ12 communication interface.
- No external power required: powered via data cable connection to the controller.
- Optional Bluetooth-version display unit model: RM-5B.
Applications
- Off-grid solar photovoltaic systems (panel + battery + DC load coordination)
- Battery charging and load control in 12V/24V systems with MPPT energy harvesting
- Systems requiring Modbus/RS232 monitoring and parameter adjustment
