While we are persuading the Government to make the harvesting of rainwater part of the building regulations (Letters 15 June) we could also install solar cells on our roofs to produce a 12V supply to reduce reliance on power stations.
So many appliances around the home now use low voltage power. We generate electricity using a variety of heavy engineering systems, change this to high voltage for distribution, drop it to 240 volts for local distribution, and then drop it low voltage for a lot of our appliances. Each of these processes has a loss of effi ciency.
We could use a low voltage supply in a separate circuit around the house, with backups from the mains for those days when the sun does not shine, and it also could be combined with local wind power.
With greater use, the cost of the solar cells and batteries would drop, and installation during building is always cheaper than retrofit.
Adrian Pope, adrian. pope@mouchelparkman. com