Video of a DIY energy generator. Converting mechanical energy to electrical energy. May be able to keep charging a battery in the background as a backup if the main energy generator is wind or solar since their might not be much wind or sun.

Might be harder to get all the materials but is pretty simple to make.

DIY energy generator from hydro to electrical energy. This can be used as a main power generator if the water is strong enough to make it spin fast enough. However this might be harder to get water to power it since it would just be a waste of water if we just leave a water outlet on like it is in the video. If I make the water cycle somehow, it might be too complicated for this two week project. The components of this may also have to be waterproof. Might be able to use rain to power but no rain in beijing.

Another version of a energy generator neodymium magnets, can generate constant energy, however might be more complicated to make and get materials for it. Depending on how much power this can generate, this can be used as a backup or it can power battery as main constantly.