Dear members,
Thanks for all of your excellent contributions to the forum! I've learned so much reading your thoughtful entries.
My wife and I are soon to purchase a 172 and I'd greatly appreciate your insights concerning the DC power supply.
Background: After 7 years of moderate-to-critical struggles, our Make-a-Wish child is doing much better...able to take trips without a lot of special equipment...and ready to get out into the world and make up for lost time spent in hospitals and at home. :)
Given our family circumstances, we're not "campground" people. Crowds, strangers, and especially environments where people are drinking are things we need to avoid. Therefore, we expect to primarily "dry camp" whenever possible...dispersed-camping sites approved by the state DCNR...the quieter, "no hookup" sections of state parks where a small TT is permissible, dispersed sites within the nearby national forest, etc.
(Disclaimer: I
know that I should learn by experience. I
know that I should "get out there and camp" before worrying about mods to our unit. I
know I'm being impatient and probably not as fiscally responsible as I could be. I also know that we love our kid and want to make our unit as functional and reliable for him as possible, within our ability.)

A few things regarding which I'd appreciate your insights/expertise:
A) I know we're going to have to purchase a generator if we want to run the A/C unit. This is important, because our son requires a consistent, temperature-regulated environment. It looks like an "inverter generator" is the way to go...quieter for him...more efficient...etc. I've read that the pod A/C unit draws anywhere from 1200 to 1800 Watts...would you feel comfortable with a 2000W generator? 2200W are also feasible for us if you thought it would make a difference. The 3000W+ are just not "in the cards" for us.
B) Regarding the battery...I hate to be wasteful, but I want something dependable that I don't have to worry about, provided I follow maintenance protocols. I'd also prefer to stick with 12V batteries (and not the dual-sixes), as one of them already comes with the unit.
If the truth is that buying a 2nd battery will get us safely through a 4-5 day trip without obsessing over DC consumption...and that's it...I'd rather take that route. When the first one hits 50%, pop it out, replace it with the other, and begin re-charging the first one as soon as possible?
What about a dual-12V configuration with two 12V batteries wired in parallel on the tongue of the trailer? Twice the capacity...still 12V. Does this invalidate the on-board battery monitor? How would it know that you've got "twice the capacity" versus the original, single battery? Have to monitor by hand with a voltmeter instead of using the on-board indicator?
Leave it as a single battery with a 120 Watt solar panel attached throughout our stay? Could it continuously re-charge the battery while the battery is in service...or would it have to be disconnected from the DC system of the TT first? Is this a viable means of prolonging (observably) the "safe operating 50%" of the battery? More fuss than it's worth?
I'd really appreciate your thoughts on this. I want to find the most reliable, no-fuss way to make sure that we're going to make it through a long weekend without ending up in the dark or needing to head home unexpectedly. Our situation is definitely not in the mold of "2 careful, energy-conserving adults"...we have 2 kids and a light will get left on at some point...the water pump will get left on for an afternoon before I notice it...someone will leave the fan running in the lavatory, etc.
Money is a consideration...but if putting $300-$500+ into our power system makes it "fool-proof" for us and keeps us out there as a family, it would be the best money we ever spent.
Thanks!