Power Consumption Of Heated Gadgets

Given your scenario, then current is of more importance but coudn't you just do a couple of snapshots to satify your curiosity using a clamp meter?

Why would you need a permanent installation?

 

I usually fit a voltmeter rather than amp as it will tell you not only the ancillary drain on the system while running it also tells you if you charging is correct when under load or no load and if you have trouble with starting it will tell you if your battery is going down the pan.

 

I've just bought three of these - custom configured for specific applications :-

http://www.sparkbright.co.uk/sparkright-eclipse-battery-voltage-monitor.php

In effect they will give indications of charging system and battery health. They should be fairly discreet in appearance, low drain and can be used to 'simulate' a vehicle alarm in a non-op. state whilst simultaneously indicating battery voltage status. The guy that runs the company is incredibly helpful and it has been a delight dealing with him. I haven't fitted them yet (they're intended for 2 Street Triples and one of my T3's) but they look the business and were very inexpensive relative to their appearance, quality and functionality.

Wholeheartedly recommended!