Pulse Width Modulation Solar Charge Controllers

Cost-Effective: PWM (Pulse Width Modulation) solar charge controllers are generally less expensive compared to MPPT (Maximum Power Point Tracking) controllers. This makes them an attractive option for smaller or budget-conscious solar power systems .   Simplicity: These controllers are straightforward in design and operation. Their simplicity makes them easier to install and use, requiring less technical expertise and fewer adjustments than MPPT controllers .   Reliability: With fewer complex components, PWM controllers tend to have a longer lifespan and are less prone to failure. Their robust design ensures consistent performance over time with minimal maintenance .   Three-Stage Charging: Many PWM controllers offer a three-stage charging process (bulk, absorption, and float), which optimizes the battery charging process and prolongs battery life by preventing overcharging .   Temperature Compensation: PWM controllers often include temperature compensation, which adjusts the charging voltage based on battery temperature. This feature helps to optimize battery charging efficiency and extends battery life in various environmental conditions .   Cons Lower Efficiency: PWM controllers are less efficient than MPPT controllers, especially in systems where the solar panel voltage is significantly higher than the battery voltage. They do not convert excess voltage into additional current, which can lead to wasted energy ​.   Limited Application: They are not ideal for larger solar systems or situations where the solar array voltage greatly exceeds the battery voltage. In such cases, MPPT controllers are more effective in harnessing the maximum power from the solar panels .   Performance in Cold Weather: In cold weather conditions, solar panels typically produce higher voltages. PWM controllers cannot fully utilize these higher voltages, leading to lower overall system efficiency compared to MPPT controllers, which can adapt to these conditions more effectively .   Less Optimal for High Voltage Panels: When using high voltage solar panels, PWM controllers are not as effective. They are better suited for low voltage solar panels and battery systems, which limits their flexibility in various solar power setups.   No Maximum Power Point Tracking: Unlike MPPT controllers, PWM controllers do not track the maximum power point of the solar panels. This means they cannot always ensure the most efficient energy harvest, leading to potential energy losses, particularly in systems with varying sunlight conditions.   KOHAN is a professional PWM/MPPT solar charge controller factory. Specializing in providing customized photovoltaic charge controllers to customers around the world. Three-year warranty, feel free to consult!