> Unfortunately we do not have big roofs here. In bigger cities like > Singapore (or Shanghai, Beijing, Hong Kong, etc), majority of > the people live in high-rise buildings. So even if you put Solar > panels all over the roofs, it probably is not good enough. ;-) Staying in a high-rise apartment as you do, I just ordered a solar panel off ebay to try to get rid of my "not switching off" sin. I figure the main "conversion" efficiency of my solar charging station shall be in cutting the "not switching off" waste. In SGP, the cost of this waste is very expensive, 2nd in the world after London (2005 data). With the pound drops, our electricity should be the priciest now. Yes, this is a x'mas present for myself. > Many people here us electricity powered heater. I used > to have a gas powered heater but it was broken. My gas powered water heater has been running for more than 13 years. Brand pamola if you are interested. Ling SM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist