Hi rarebear.nm,
Our Phoenix Cruiser is not a Coach House, but the boondocking dynamics and challenges will be identical if the following is the same. Fresh water and batteries is what it's all about, along with how much gas you have to run your generator. The C.H. being built on an E450 addresses the gasoline.
It is remarkable how much thought is required for successful boondocking. My wife and I quickly learned the ropes with our 2007 Phoenix Cruiser 2350
SEEN HERE. The rig holds 41 gallons of fresh water and is equipped with two house batteries. Our chassis is a 2007 E350-V10 with 55 gallon fuel tank.
Regarding fresh water considering just us two adults, it's all about taking the right kind of shower at the right intervals. In a pinch to take an extra shower, we've added fresh water into the holding tank the hard way with a jug, and drained gray water out onto the campsite.
Originally equipped with two-12V lead acid wet batteries, battery power was by far the biggest issue so I made the following changes which made a monumental improvement.
- changed to two-6V AGM house batteries
- converted all interior lighting from florescent & incandescent, to LED
- installed a volt meter where I see it all the time, "in my face" to be most mindful.
When boondocking, I typically charge the house batteries for 1.5 hours in the morning to bring them up to an adequate level to support the next 24 hour period. I use a more powerful external charger to reduce the generator run time to that 1.5 hour period. But it does depend on our energy usage. If we return late and go to bed early, we use so little energy that I can either skip a recharging cycle, or reduce generator run time. But if near the end of our day, we turn on the whole house inverter and watch a DVD movie on the TV, the generator needs to run that 1.5 hours the next morning.
Some people go deeper with solar technology. I considered it but wanted to keep the complexity down and try this method first. We also appreciate shaded campsites. This method seems to work for us with our travel lifestyle.
Keep in-mind, we don't hang around our rig all day. We are out and about in our tow vehicle, either sight-seeing or hiking. The exception would be a serious rainy day keeping us home and use lots of battery energy. I would then run the generator 1.5 hours again in the late afternoon.
Solar panels instead of generator usage is an inviting alternative. Just maybe one day I will leap into it, but I'm not there yet.