This as been said before but i'll add my story. We almost always boondock, State/National parks. We used to only have a generator (Honda 2000), It would always be running to keep the batts up and I use 2 6volts and all LED lights in the trailer. I just got tired or hearing a genset in such beautiful places. I went to 300 watts of solar and have never looked back. One advantage that has not been mentioned is that your coach batteries are always ready to go between trips. Just hook up the trailer and go, no charging them a few days before you have to leave. I still have a generator for the odd times that we need to run the air, but that usually means that campers around us need to run theirs as well so I tolerate them. Solar is by far the best mod I have made to my trailer.