Laptop power test with killawatt

[jimindenver]

I thought I had gotten away from this topic since I replaced the netbooks with 2 in 1 windows tablets. Then I received back a 17 inch HP that I had given Mom a few months before she died.

Now the tablets can charge off of a USB or 120v. The Laptop is 120v with the charger output rated for 19.5v, 2.31a, 45w max. The first thing I tested was the draw with just the power brick plugged in, it was0.0w with a occasional blip of .03w.

I plugged in the laptop sleeping and it drew a average of 12.9w around 75% charged. I'll have to see what it draws off/on and fully charged. I can see the charger turning off when at 100% and off.

I turned on the computer and it drew 20-25w depending on what it was doing. Downloading a video or spinning up the DVD was higher but usually 20-21w.

I took the battery out and started the computer, after it started it averaged 10w and would draw as much as 16w briefly depending on what you do.

So if I keep the slab of granite, I won't be carrying it around which means I don't need the battery to be charging all the time. 10-16w for a 17 inch, quad core is pretty doable.

I'll put the battery back in and see what it does fully charged.

 

[jimindenver]

to add

The laptop sleeping with no battery is drawing 0.4w

The power saving would apply to a 12v set up too. You simply don't use as much power when not charging the battery when you don't need too.