The solid inverter housing can protect from drops and bumps and stand up to harsh environments The inverter has a high-performance mute cooling fan that helps keep the inverter running at a low temperature and extend its life span It has over-voltage protection, over-load protection, low voltage protection, over-current protection, over-temperature protection and short circuit protection to guarantee safe use The inverter can convert the 12V DC stored in the battery into 220V AC power The solar panel absorbs light energy and converts the light energy into electrical energy and stores it in the battery (battery not included) The solar controller can control the charging and discharging of the battery Specification: Solar panel: Working power: 20W Size: 480*280*2.5mm Open circuit voltage (convection): 20V Maximum power voltage (vmpp): 18V Short circuit current (isc): 1A Maximum power current (impp): 0.75 Output: 12V Inverter: Startup peak power: 500W Continuous power: 250W Display: Input/output voltage Input voltage: 12VDC Output voltage: 220VAC Dual USB interface: 5VDC/2.1A Quiet current: ≤0.5A Conversion efficiency: greater than 90% Protection function: overload, overheating, high voltage, low voltage, reverse connection, short circuit intelligent temperature control, can be used for electrical appliances below 300W (excluding inductive load electrical appliances and motor products) Note: Use standard battery cables whenever possible. Otherwise, it will not output full power! Start the inverter. Start the machine first, then turn on the load. Shutdown: disconnect the load first, then shut down. It is strictly forbidden to reverse the main power supply to the output port and reverse the battery to the load. Do not overload household appliances such as inverters, motors, water pumps, air conditioners and other inductive loads. The rated power is multiplied by at least 3 times, and the value obtained must not exceed the inverter power. The inverter red light is on and a beep is heard. Check if there is an overload and whether the battery is fully charged (regardless of whether the battery is new). Charge the battery for at least 3 hours and try again. When the inverter is not in use, turn off the inverter switch. If the inverter buzzes, disconnect the load first, turn off the inverter switch, and then check the problem.