I have an Apollo gate opener with a 30' cantilever gate, (20' opening). The 5' high chain link gate opens on rollers. It weighs around 300 pounds, (I think). I have 2 solar panels hooked to a battery controller, (which keeps you from over charging the battery), and deep cycle battery. I mounted the antenna on top of one of the main posts for better coverage. I have used this gate for about 15 years. Sometimes I swap the battery out with a spare during long periods of overcast skies. Just grease the fittings a couple times a year, and battery maintaince now and again, and check the solar panel voltages occasionally. Never had a problem with it. I always wondered about getting hit with lightning, but it never has been affected, even with several trees being hit nearby.
After having an automatic gate...which keeps out the uninvited rif-raf, helps keep the place secure, and the dogs happy inside, I could not live without one. It has made a world of difference. A closed gate makes a statement to the outside world. And...if someone knowingly goes past the gate uninvited, past the dogs, then they are probably up to no good and can visit the end of my gun...Ain't America Great!!