Forum Discussion

adamis's avatar
adamis
Nomad II
Aug 17, 2022

Bigfoot Camper - Major Modifications I'm Considering...

So I've had my Bigfoot for several years now and have been generally pretty happy. In recent communication with another member here, I've thought once again about some major changes I have toyed around in the past. I thought I would spell them out here and see what others think about the idea.

1. I want to change out my AC unit. The current one I have sits 17" high off the roof and stands out like a sore thumb. It's also very noisy. My first thought was to go to a 12v DC unit. More common in the trucker world but starting to be more available due to the Sprinter camper craze. Expensive yes but lower profile and allows for running off batteries.

2. Alternative to changing out rooftop AC unit is eliminating it all together by combining it with the furnace. I do not know if there are ready made solutions out there but I have considered doing my own fabrication project to combine these two units together. The clear benefit is not having a huge AC unit on my roof anymore for trees to snag and I can either add another fan / vent in the opening left behind or just glassing it closed.

3. I currently have 200w of solar and a single 100AH LiFePo4 battery. I can easily add another 200w of solar, maybe even close to 400w if I eliminate the AC on the roof for a totall of 400w to 600w of solar. I have plenty of space to add another 300AH of LiFePo4 batteries. Going this route would allow me to run my AC on batteries which really is the ultimate goal really. Nothing fancy or unusual here.

4. Eliminate the generator and possibly 1 of 2 20lb propane bottles. Right now the generator is almost never used. It is bulky, loud, and heavy. Yes, convenient once in a while but with a much larger battery and solar setup I can't see how it would every be used. If I eliminated the generator I would consider finding a fiberglass shop to close off the outside access panel completely. I could then repurpose that space for better under counter / sink storage with full width drawers or something. Eliminating one of two propane bottles just frees up additional space and more weight savings. A single 20lb bottle should last at least one if not two weeks for just fridge and stove duty.

So those are the thoughts I am kicking around. Some of these paths are well traveled, others not so much. None of this is really necessary to improve our current camping lifestyle, much of it is for kicks and giggles. So with that, I'm putting it out to all you "seasoned" camper gurus for your own thoughts.
  • The math rarely works out well for RV solar panels running an RV A/C unit. A typical RV A/C pulls roughly 1000 watts. If you look for a small unit figure 700 watts. I would not try to go below that because the unit would not keep up. So you want to run a roughly 700 watt unit with 600 watts of solar? It looks like you live in Northern CA. Solar calculators show your 600 watts in Northern CA on this date would produce a theoretical maximum of 270 A/H. That is enough to run your A/C for a total of 4.7 hours a day. Of course that would be with no other use of electricity with perfect conditions, no clouds, no shade, no dirt on the panels and panels that actually perform to specs. On top of all of that, you need to keep your RV in the blazing sun. I have found that my TC just plain cooks like a tin can in the sun.

    I have done a lot of camping in desert Southwest some of it in the summer with temps up in the 90s. If I am driving, I keep the pass-through windows open and a vent open in the camper. The truck A/C does a pretty good job of keeping the temps in the RV reasonable. When I am camped, I try to keep in the shade. Usually, I would need to run the A/C on generator for an hour or so in the evening to cool everything down well. Then I can get by with a small relatively quiet fan that blows air across the bed. When it is too hot for that, I look for hook ups or even better get out of Dodge.

    A more feasible budget friendly approach would be to replace the A/C with a new unit. The new ones are quieter and have a much lower profile. Costs are not bad, but I have no idea about installation costs. You mentioned eliminating a propane tank. I guess that means your current generator runs on propane. If so I would get rid of it. My 18 year old Honda runs great, is pretty quiet and has had no maintenance except oil changes and one year I felt I needed to do more so I replaced the spark plug. I keep the gas jugs between the ladder to the roof and the back of the camper. Three or four gallons on the back and a gallon in the generator lasts a long time and is easy to refill. Even though a 20# propane tank lasts me about 2 months, I am very happy to have two tanks. Over the years I have had all sorts of issues getting refills. I will not do exchanges. First you only get 15# instead of 20# and the tanks are often out of date and later on vendors cannot legally refill them.
  • Even a small A/C takes a lot of 12V DC amps to run, hence you'll need a lot more solar and batteries.
  • Not having used my generator in quite a spell except for biweekly exercise, I can’t argue that you should not eliminate it.