Terry, we have the Zamp 120 Watt solar panel. I bought a blemished model on sale although I do not see any blemishes or imperfections for a little under $500. We used it on most of our dry camping trips this year which was about 5 times. If I had to do it over again, I would purchase the Renogy 200 Watt panel especially at that price. As long as it came with a controller which I believe it does then all you would need is that adapter to have it plug into the Zamp port on the tub. The Zamp 120 Watt panel has worked well for us but I think a 200 watt one would be even better and give us more charge when the light starts getting low. Of course, the 200 watt one might be a lot heavier. I had read up on everyone's recommendations prior to buying one and it sounded like 120 watts was minimum. I think the best investment to deal with the electric power is to go with the two 6 volt golf cart batteries and then the 200 watt solar panel will come in handy. We tend to go camping and take off and sight see and not be around our campsite much. When we do that we put the solar panel away for security. During that time the battery does not get re-charged. Once we get back to the campsite, one of first things I do is hook up the solar panel to recharge the battery juice that we used the previous night. I believe a 200 watt one will charge my battery faster and especially if the light gets low. That's my 2 cents on the subject.