Note:Due to different printing batches, if there are slight differences in the words in kind, it not affect the use. Working voltage: 18-80V; Maximum current: 20A Rated power: 12V20A/240W, 24V20A/500W Compatible batteries: lead-acid/lithium battery/colloid battery, etc. Heat dissipation: natural cooling + smart fan Product name:MPPT solar buck controller Display: LED digital tube display Conversion efficiency: 98% Rechargeable voltage:12V 24V Working temperature:-20-60 Protection level:IP30 Precautions: 1. It is strictly forbidden to use the controller with overvoltage and overpower. The controller not work if it is only connected to the battery without connecting the solar panel 2. Before installing the controller, please determine the voltage level, which must be consistent with the battery voltage. It is strictly forbidden to charge the low-level battery with a high-level voltage 3. Installation steps: first connect the solar panel to the controller, and then connect the battery. The input and output of the controller are both red positive and black negative 4. The length of the wire connecting the controller should be as short as possible to reduce power loss 5. The solar panel should be placed in a place without any obstruction from the sun 6. The controller heat up during operation, and it is recommended to install it in a ventilated and heat-dissipating environment 7. The blue (black) line in the charging line of the-original electric vehicle charger is the positive pole, and it should be connected to the of the controller output line. Color:Silver Grey Material:Metal Package Contents: 1 * solar controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.