Speaking on Deep Background, the Press Secretary whispered:
Concur with you need wattage not amperage. There is a 'relatively' cheap method of doing this however local electrical codes may put a damper on this type of project.
You put a current transformer on each branch circuit. A 'typical' current transformer will generate 1Millivolt per Milliampere. You then install a A/D board in a PC and write a simple application to query each channel of the A/D. or purchase a commercially available SMNP datalogger.
I assume Alex is looking for a boxed solution. If not concur it's Not Rocket Science [TM-Click&Clack] to build a system. You can do the voltage sensing safely. {My too-early AM thinking is that there will be too little phase shift in an unloaded Voltage Transformer to worry about.} You'd need a VT per panel leg, but a CT per branch circuit. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433