Your own flexibility in energy usage, plus use of a backup generator allows you to adapt to temporary shortages, while the automatic charge control manages any overproduction. We caution against the temptation to start with generator, batteries and inverter, but postpone solar modules until later. If you can, start with enough solar modules required to do the job, since this is where most of your power originates. If budget requires, perhaps start with half or a third of the panels, and add the rest in subsequent years. This will help avoid battery problems and save many generator hours.
Solar power is modular.
When the family grows or the cabin becomes a full time home, you add more solar modules. If you need to upgrade a charge control or AC inverter, Backwoods Solar takes your trade-in if originally purchased here. Consider your long term objective in making these decisions. With this flexibility, several methods of estimation can give a close idea of what equipment you need. The method is best learned from one of the books we sell, which contain worksheets and instructions.