Join Date: May 2002
Location: Toronto, Rogers, 9865 & 8300-eHDD, Sharp LC75N8000U, Denon AVR4310Ci; Sony KDL40W3000, 9865
I haven't used my UPM Watt Meter much lately because I had done most of my research years ago per post 1 of this thread. Lately I've been monitoring my rechargeable devices again since I wanted to see how much power they drew and whether it made any significant difference if I charged them on or off peak.
Most of these rechargeable devices cost less than a cent to recharge, but I was surprised that my charger for my MacBook Pro used power when it was plugged in, but not charging my computer (totally disconnected). It used 2 Watts when plugged into the wall, but not connected to the computer! I never leave it plugged in, but I was surprised by this because I thought there would only be power use with a "complete circuit", but I guess the "brick" itself has some smarts which use some power. It also uses 2W when the computer is off, but fully charged.
So, if you've got a bunch of 'charging bricks" and you leave them plugged in, some of them may be using power even when they're not charging anything. Easy to check with an inexpensive Watt Meter. It's no big deal, but I thought I'd post...
PS. The UPM Energy Meter only measures down to 2W, so some smaller devices don't even register when charging. My toothbrush doesn't register, probably using only 1W when charging, while my shaver does register because it uses 3-5W. when charging. My eneloop battery charger uses 2W for 2 batteries and 4W for 4 batteries. When 2 of the 4 batteries are charged, it goes down to 2W and the indicator lights show full charge on the two fully charged batteries.