Mike, On Tue, 5 Sep 2006 16:44:08 +0100, Michael Rigby-Jones wrote: > Some people have "night storage" heating to take advantage of the cheaper off-peak rates, Yes, my house has one night storage heater, which is probably why Economy 7 was installed by the previous owners. When I did use it, the heater didn't do much more than stop the window above it freezing over, so it's been switched off for several years. But I heat water with an immersion heater, which operates on off-peak juice, and the tank stays hot enough through the day. Over the last quarter my peak : off peak usage has been about 2.1 : 1 - it would be nice if it was the other way round, the bill would have been 25% lower. > but I was just wondering if off-peak charging of batteries and using an inverter during peak hours would be viable? Initial costs would be pretty high I guess. They are! :-) I've been trying to get a scheme like this going for some time (with a bit of solar to help out), but the charger/inverter seems to have arrived with a fault (from Taiwan, so I can't just post it back) and I'm swapping emails/photos/videos with them, trying to sort out the problem. I'll let you know how it goes! Cheers, Howard Winter St.Albans, England -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist