My place is off the grid, and it's a lot of work. You don't get to just pull up in the car and go inside and go about your business. During bad storms and rainy seasons we have to be out in it, making sure the driveway gravel doesn't get washed away.
Rodents are probably the biggest ongoing issue. They chew everything, including wooden walls and floors, wiring, not to mention fabric and plants. Any place a pipe comes through the floor into the house has the potential for them to chew a bigger opening and get in.
If you do solar, it's an investment. Solar is not cheaper, but the corporate electricity will probably go out a lot in rural places, especially during storms, just when you need it, and it might go out for a week or two if it's bad enough. I like solar a lot, but you need to understand electricity, DC and AC, and you have to downsize appliances and always count wattage and amps before turning on appliances to make sure you don't blow the circuits.
We got a smaller refrigerator, so I can things instead of freezing them. A solar system needs to be big enough so that it won't drain the batteries if there's a 7-day cloudy period, meaning there needs to be more batteries than you might think are necessary. It's not good to let them go below half-way charged. The cheap batteries are just that, cheap and don't last, so buy the best you can afford. Buy them all at once so you know their condition.
We use cells phones, got rid of the land line. Too many ants in the connection boxes, too much moisture causing issues, yellowjackets getting into connection boxes, always having to maintain it. Having to stay home if it goes out and wait for the service guys, who try to tell you it's your fault it went out.
We have a composting toilet, it's great, but it's a bit messy, only because there needs to be containers of dirt and weeds to put into it. I don't buy the expensive bacteria they try to sell you because it's already in the soil, and that's what turns it into real
compost, is treating it like real compost. Just don't let it get too wet. Some people don't want composting toilets inside. I like to put a smaller container inside that can be removed easily and taken out if the balance of things gets out of whack. I compost in metal garbage cans outside in the sun for another year. If company comes and uses it a lot, or in the summer with gnats and flies, sometimes it's better to just get it out of there and start again. I do like using lavender, rosemary, lemon balm and other herbs to throw in there to not have it just smell like the forest floor. That's okay, but it does get associated with everything else in there.
Water is the biggest issue. The cost of electricity for a pump on a well can be pretty high, so prepare for that. If the power goes out, so does your water. If you store water in a big tank, which you might have to do for fire regulations anyway, there is a good supply at hand. If the tank can be uphill from the house, then if the power goes out it can still get to the house by gravity flow, but not enough pressure to make the shower work. Sometimes the water lines can develop leaks and the tank will empty without your realizing it, so try not to have long lines or lots of connections. Having water lines below ground means you can't keep an eye on them, and if they leak you'll have to dig them up to fix it.
Our cabin was built with passive solar heating in mind. The longest wall faces the south (northern hemisphere) and has big windows that are not Low-E. The windows let the heat in, but the insulation in the walls and ceiling keeps the heat in, and it stays comfortable. We live in a mild climate, no snow, so it's easier to keep the temps moderate. The exterior color is dark, dark olive green and the shingles are black. If it gets really hot in the summer where you are, you would have to install fans in the attic to keep it from getting too hot.
And be sure to have a porch and a mud room. Tracking in dirt or mud is a constant issue. There needs to be some entrance room where all the dirty shoes and boots can be changed out of and cleaned, and wet rain gear can be hung to dry without causing mold/moisture issues. Even in the summer it's amazing what boots with big soles will track in, little sticks, clumps of dirt.
when I first got this place I just wanted to do everything I had in mind, how exciting! But now 15 years down the road, I am trying to simplify, and leave free some time that isn't about a project that is going to create more maiintenance