Solar panel systems are the most popular route when it comes to off-grid power. There are other options as well including wind, water turbines and a generator (great back up if the battery stores deplete).
Even gas can replace otherwise electrical appliances. Just ensure that whichever one (or combination) that you go for is suitable for your region factoring in weather, trees, direction, path of the sun throughout the year, mountains/hills etc.
It is always good to have a generator back up to ensure minimal interruption for you and your guests in worst-case scenario events. Adequate battery stores is an important consideration as well and there are a few different types of batteries that would suit different purposes/climates better as well.
A bit of light reading on the internet and consulting an electrician/solar system installer and even your neighbours can be a great source of information. Just be sure to keep it local as they will base their opinion on the specific location.