Total posts : 45366
You wrote: (in fact, i have to resolve a small problem to connecting my 4 radials without soldering because i have no soldering skills)
Just a couple of suggestions. You can bind the wires together with a wire nut and put some silicone gel (auto parts store…used for waterproofing connections) in the nut to keep water out. Don’t use the silicone calk as it will corrode copper.
A better method might be to use what is called a split lug or split bolt connector. If you havn’t seen them, they look like a copper bolt which has been split lengthwise. A nut compresses the wires. I like them because they squeeze all the wires securely. Your hardware store should have them.
Hope this helps. I enjoyed looking at your pictures.