The MPPT (Maximum Power Point Tracking) charging method in solar street light controllers has the following characteristics and advantages:

Characteristics:

1. Multiple Charging Modes: MPPT controller support multiple charging modes, such as constant-voltage charging, constant-current charging, which can adjust to meet various demands and match different battery types.

2. Dynamic adaptability: MPPT controller can adjust operating point of solar panel in real time, based on the operating condition and variation of illumination intensity, to make sure that the charging system always keep its best state in service.

3. Maximum Power Extraction: MPPT can track the maximum power point of solar panels in real time and adjust operation voltage and current, which achieves the purpose to maximize the efficiency of energy conversion.

4. High Charging efficiency: through maximum power point tracking in real time, MPPT controller can improve charging efficiency and convert more solar energy to charging current

5. Wide Operation Voltage Range: MPPT controllers have a wider operating voltage range, which makes they can match those solar panels with different sizes and configurations

Advantages：

1. Good Adaptability: Due to wide operating voltage range and dynamic adaptability, MPPT can adapt different solar panels and environment conditions and provide better versatility and compatibility.

2. Fast Charging Speed: MPPT controller can convert solar energy into current that can be utilized more quickly in shortest charging time.

3. Higher Energy Exchange Efficiency: comparing with other charging modes, MPPT charging modes can extract maximum power of solar panel, which have higher energy exchange efficiency.

4. Prolong Lifespan of Batteries: by accurately controlling the charging process, MPPT can avoid overcharging and undercharging, so that lifespan of batteries can be extended.

In summary, MPPT charging provides a more reliable and efficient charging solution, enhancing the performance and reliability of solar street light systems.