All those folks saying 300, 400 watts needed are not considering that unless you are also considering how much battery you have, AND you are only running stuff at noon, most of that solar capacity will be a waste of money.
Here's why.
For the most part, running things takes power out of the battery, unless you are using LESS power than the panels are creating AT THAT MOMENT. The panels replace what comes out of the battery, but only while the sun is shining, and then mostly only during the 4 hours around noon when the sun is strongest. 100 watts of panels will produce just about the 40 amp hours you dare use of the standard 80 amp hour single battery most TTs are delivered with. If that's all the battery you have, putting 200 watts on it means it will fully charge in only 3 or 4 hours. If you have 400 watts worth of panels, AND provided your battery can also charge at that high rate, it'll only take an hour or so. What happens to the charge from that 400 watts of panels during the rest of the solar day? Unless you have a device running during that time, all that capacity does exactly nothing. Waste of money.
So here's the deal: (A) you bet, more of everything is better -- but possibly wastefully expensive; (B) if you don't actually USE 1,000 amp hours of power daily, you don't need the ten 100 amp hour lithium batteries costing $10,000; (C) if a single 80 amp hour lead acid battery works for you, you only need a single 100 watt solar panel, unless, perhaps, you camp permanently under cloudy skies or under the trees.
Get a grip folks. Figure out how much power you actually use, buy the batteries necessary to support that use, and then buy the solar panels needed to keep those batteries charged. Use the money you saved by not buying excess capacity to go camping!
