Samlex America 20A Solar Charge Controller - 12/24V One Size. It is based on an advanced design using a microcontroller for digital accuracy and fully automatic operation. It can be used for 12V or 24V battery systems.Features:3-stage intelligent Series Type PWM chargingAutomatic battery voltage detection: 12V / 24V100percent input and output within -35 degrees C to +50 degrees CElectronic protections: overheating overcharging over-discharge overload and short circuitReverse protection: any combination of solar module and batteryOptional MSK-TS External Temperature SensorApplications:Recreational and service vehiclesOff-grid gridPortable charging kitsBoats and marine craftsFieldwork or mobile officesTelecommunicationsSpecifications:Input: 12V / 24VAmps: 20 ampsWeight: 0.66 (lbs)Weight: 0.3 (kgs)Dimensions: 6.28 x 3.2 x 1.89 in.Dimensions: 159.6 x 81.4 x 47.88 (mm) Specifications for Samlex America 20A Solar Charge Controller - 12/24V: Manufacturer: Samlex America Color: Black Application: Outdoor Package Contents: Samlex America 20A Solar Charge Controller - 12/24V Samlex America MSK-20A: 20A Solar Charge Controller - 12/24V One Size