WOW! This system we bought last week to use on our travel trailers (singe?) battery, group 27, performed flawlessly! We are new to the "RV" life and purchased a 33 foot trailer with electric everything! Which included a tv, super slide, awning, electric tongue hitch, and all the obvious, outlets, lights (LED), microwave, ect. Well I never knew how power hungry we were until we took our trailer out for the first time and my 2 year old wanted to watch a dvd while eating her breakfast. My wife and I have the coffee maker going while the furnace is warming up our ice cold trailer prior to our fishing trip. Go figure, our battery died! Like I said "Brand new" to the rv life. Well as most experienced rv folks know that when your batt dies even your generators are pretty much worthless with the stock charger onboard. So I needed to figure out what needs to be done in order to my girls happy :0). I went solar! I did my home work for weeks looking at inverters and multiple battery options along with chargers and so on and so on and so on, my brain hurt! and then I found the "WYNNS" (if you were like us lost in the dark after the rv sales team made there deal then do your self a favor and find the Wynns) who explain everything when it comes to rv POWER!Solar power! Its unbelievable, we got our 120 watt Go Power portable system and I honestly pulled it out of the box, unzipped the very well made carrying case and unfolded the panels. I clamped on the positive and negative jaws to my batteries terminals and off we were pulling in clean energy charging my battery. My batt was at 2/3s charge which isn't very good, close to spiking amps and blowing fuses but even though it was overcast within two hours the battery was at 100%. We are sold! and for folks like us that bought a trailer or want to buy a trailer to camp with and don't want to be plugged into rv parks then spend the money and go solar! Within the next week or two we will be boondocking (dry camping) on BLM (Bureau of land management) with GO POWERS 480 watts kit on the roof top along with the 120 watt portable GO POWER folding unit producing a total of 600 watts of usable energy! Unreal, all from the sun, why are we all not using this natural resource? Anyhow thanks Go power after this relaxing weekend of camping you have proven yourself and we are forever faithful and a life changing solar power family.