On 14/11/11 11:23, Andy Taylor wrote:

Take a look at this - http://www.retrocomputers.eu/2011/01/11/how-much-electricity-are-you-using/

Software logs to a MySQL database with a web front end. My meter is connected to my server via a serial to USB cable.

Thanks, that looks like the sort of thing I'm after.

I've found what I hope is a suitable meter on eBay and will have a play.