This stupid balloon thing spread soot everywhere each time you removed it and deflated over time.
An extra word on solar power:
Unless you have at least 8 panels (2 person house) or 12+ panels for a large house/family the outlay isn't viable. It also concerns me that people cutting down north-facing trees so they can get more sun for their solar panels. In the Southern Hemisphere, surely north-facing (particularly deciduous) trees are environmentally (as well as aesthetically) desirable.