Features:  - High conversion efficiency, long service life, to ensure full power.  - The unique process component, beautiful and strong anti snow, convenient installation.  - Aging resistance, corrosion resistance, weak light effect.  - Suitable for all kinds of small power appliances, emergency lights, advertising lights, traffic lights, home lights, electric fans, such as solar water pumps, solar street lights, small solar systems, etc.     Specifications:  Solar panel:  Material: Monocrystalline silicon.  No-load voltage: 19V DC.  Load voltage: 12V DC.  Size: Approx. 345x210mm.  Color: black.  Controller:  Current: 10A/20A/30A/40A/50A.  Batt voltage: 12V/24V auto.  Max solar input: 12Vbattery. the highest 23V; 24Vbattery when the highest 46V.  Float charge: 14.4V defaul, adjustable.  Discharge stop: 10.7V (defaul, adjustable).  Discharge reconnect: 12.6V(defaul, adjustable).  Charge reconnect: 13.2V.  Voltage of open light: Solar panel8V(Light lights delay).  Voltage of close light: Solar panel 8V(Light off delay).  USB output: 2 way USB output, 5V/2 5A(MAX).  Self-consume:＜10mA.  Operating temperature: -35~ +60C.     Application scenario:  Suitable for single board or multi-board use.  DIY single board connected to USB controller, can directly output 12V &5V. .  *2 The power of parallel connection of the two boards increases, the current increases, and the voltage does not change 12V *2 The power of the serial connection of the board increases, the current does not change, and the voltage increases by 24V.  *Multiple pieces can also be connected in series or in parallel.     Package included:  Type 1:  1 x Solar panel.  Type 2:  1 x Solar panel.  1 x Controller(10A/20A/30A/40A/50A optional).  1 x DC Cable