That's not how panels work. True that P=IV, but the panels are rated at the maximum levels. The voltage for the panel ratings is not 12V. It's usually between 17 and 18V. So, a 100W panel won't get you 8.333 amps. A 100 W panel will get you 5.6-5.9 Amps. Big difference. So, 5.8*.75*6 = 26 amps per day ... more than 30% lower than your math. Always look at the specs and you'll see the max voltage and the max amp-hour rating. That max-amp hour rating will NOT change ... it is what it is. Another way of thinking about it. 100W panel at 17.5V has a max amp-hr rating of 5.7. Therefore, under the normal 12V system, that panel really functions like a (12*5.7) 68.4W panel. I is fixed in the P=IV equation, not the P or V. I believe the same faulty assumptions exist in UT's claim of a 90W panel putting out 7.5 Amp-hours (90/12=7.5). In CO, you either visit a handful of state parks that have power, or you get a generator. I don't own or use one, but it's not as simple as "why don't you just go to a CG with power?" There are very few. I've had my bad generator experiences, but I understand why they exist. Tough to see much of CO without a generator. People who take a holier-than-though approach to what the camping experience ought to be are delusional. We're all different people with different needs and expectations. Camping is a continuum and, as others have suggested, some would scoff at the use of a PUP the same as others here have scoffed at people who camp with a blender. You can fight all you want to keep NPs electricity-free and that's fine with me ... but don't complain when you hear the generator fire up while you're camping there. Be careful what you ask for. As others have intimated, that 30A cord is nearly silent. And, as much as people like to claim otherwise, I hear those "whisper quiet" Honda and Yamahas just fine in my campsite ... if only the audience were as convinced as the owners that these things cannot be heard beyond 50 feet. Good luck.