Feature: 1. MPPT solar panel regulator adopts single chip control, which supports the advantages of intelligence, strong adaptability and reliable function, etc. 2. Work at the best power point of the I-V curve with an efficiency of up to 99%, such solar charger uses MPPT maximum power point tracking technology. 3. For high-accuracy temperature detection and compensation circuit, battery life can be more durable. 4. Supports 12 / 24V system voltage automatic identification, such solar charger supports three-stage battery power display, intuitive and clear. 5. Exquisite structure and accurant circuit design maximize the use of the entire controller space. 6. Keeps 5V output with USB connector, this battery controller can meet the charging needs of digital products, practical. 7. And this battery controller is with overcharge protection, over discharge protection, over current protection, short circuit protection and anti-reverse protection. Specification: Item Type: MPPT solar controller Controller Model: CPY2420 Rated Charging Current: 20A Rated Discharge Current: 20A System Voltage: 12v / 24V automatic adaptation MPPT Tracking Efficiency: Maximum: 99% Overload and Short Circuit Protection: ≥1.5 times of rated current No-Load Loss: <10mА Overvoltage Protection: 16V; x 2 / 24V Charging Cut-Off Voltage: 14.7V; x 2 / 24V Discharge Recovery Voltage: 12.2V; x 2 / 24V Discharge Cut-Off Voltage: 10.8V; x 2 / 24V USB Output: 5V 1A Working Temperature: -35 ℃ to + 55 ℃. Package List: 1 x MPPT Solar Controller1 x User Manual