Can the solar panel be operated without a controller?

A: It's best to use a controller! If not, it is also possible, but it depends on how you use it. The function of the controller is to intelligently control the relationship between solar energy and storage battery and load, protect storage battery from overcharge, overdischarge, short circuit protection, etc. And can intelligently control the working time state of the load, etc. Please refer to the instruction manual of the controller for details. If the controller is not used, the battery may be overcharged and overdischarged, which will damage the battery, and overdischarge will also affect the battery life. In addition, the load of the controller has a requirement on the current. Generally, the load of a 10a controller does not exceed the current of 12a. If it exceeds the current, no output will be protected. Correspondingly, 10a can carry electrical appliances below 120w, 20a can carry electrical appliances below 240w, 30a can carry electrical appliances below 360w, and buyers can choose by themselves.