Solar air heaters are passive solar element that can heat rooms during cold days while the sun is shining. Building one is a piece of cake
Off-grid systems are often used in remote locations where it is not practical or cost-effective to connect to the grid, or in situations where a homeowner or business owner wants to be self-sufficient and independent from the grid. These systems can be powered by a variety of sources, such as solar panels, wind turbines, or generators, and may also include storage systems like batteries to store excess energy for use when the primary power source is not available.
Off-grid systems can be more expensive to set up and maintain than systems that are connected to the grid, but they offer the advantage of being self-sufficient and not reliant on external sources for power and other resources. They can also provide a backup source of power in the event of a grid outage or other disruption.
Most Off-grid houses in Finland are not self-sufficient. Most either import gasoline / diesel to run a generator or import electricity via electric cars.
Since I got dropped into biogas, working with Prof. TH Culhane on different biogas projects, I always wanted to have a biogas system on my own. When I came to Finland I finally got the space to build a biogas digester and then actually experiment… more