Sounds a lot like the same road I'm about to head down. I too plan on rainwater catchment for the off-grid home. Unfortunately, I don't have much roof area on the RV, so a new plan is required. What's the plan? Well, beyond having water brought in (as necessary) I thought about hanging a large tarp to gather water. (a 30'x30' tarp catching just one inch of rain equals 560 gallons. A 40x40 is 1000 gallons per inch!!!) The only other alternative for off-grid is a low volume, solar well pump. As far as filtering, a three stage UV filter is my plan. This will provide clean drinking water.
Septic: What's your plan for the home's septic? I'm considering this to be the first project on my future land. I'm planning a gravity feed drainfield system. This can be used directly with the RV, then later connected to the home. There's also other more exotic systems mentioned on some threads here.




So I have been very busy remodeling my RV to live in as I build my log cabin. I have redone the floors, walls and fixed up a lot of broken stuff (it is a 1975 dodge) including some engine work. I wound up ripping out quite a bit of the old fixtures and machinisms that no longer worked, including the fridge, water pump, generator, and many other things.
I did all the labor myself and so far the cost of flooring, et al has been very low. I've spent 700 bucks and that includes a solar panel array/battery/inverter hook up that will provide me with energy and I won't have to use a noisy, ineffecient generator or pay for gas. My next project is hooking up a water tank system. I found something really neat I thought I would pass on. I have a suction bit that hooks on to the end of a drill and conects to two water hoses and can pump water from one tank to the other end. It is simple and so far works well.
My issues will be composting on site (my land is off the grid and I want it that way) and collecting rainwater to purify and use as fresh water (but not for drinking, just to wash and shower in). I have not purchased the land yet or moved but I am only a couple of months away from doing so. I want my RV to be 100% ready before I move onto the land but there is some land clearance/slight grading to be done as well before I can do it.
Anyone have any experience with these two issues? Composting/water collection? I live in Southern California and solar is awesome but rain is so-so where I have found land. Any suggestions? Thanks.
Will
Bad spellers of the world untie!