1\What can a 400 watt solar panel run? If you have a relatively energy-efficient home refrigerator, it can generate enough electricity per day to run your refrigerator .The premise is that you have an energy storage battery so that the electricity generated during the day can be used at night. 2\How much does a 400 watt solar panel cost? We usually calculate the price of a solar panel based on its power, which is generally US$0.15 to US$0.2 per watt, so its price is US$60-80. This price does not include shipping and tax. In addition, if you want to be able to use solar energy, you generally need to purchase products such as brackets and inverters. 3\How many amps does 400 watt solar panel produce? The amps of this solar panel is 10.49-10.81 amps. 4\How big is a 400 watt solar panel? The size of this solar panel is 1722 ×1134 × 30mm. 5\How much power does a 400 watt solar panel produce? If you installed it in Washington, D.C. under classic conditions its power generation would be 400w*4=1.6kwh Power output varies depending on factors such as:Sunlight intensity、Temperature、Orientation and tilt angle、Panel age and degradation.  More questions Inquire now！