How much energy my peripherals consume?

Hi guys I have a question about peripherals and USB ports.
I know that normally USB ports provide 500mAh for external devices. What I want to know is how many mAh my keyboard, mouse, laptop coller are consuming because I dont have enought ports, so I need to use a USB hub and since it doesnt have an external power supply I need to think a clever arengment for them. Can somebody help out?
Thank you in advance.

 

The laptop cooler is going to be the big consumer. Why not get a plug-in USB power connector (ie: external supply) for that device exclusively, and then plug the rest into your laptop? You'll avoid the USB hub, and avoid running all that power through your laptop.

 

@darkvizer normally, all these devices should be satisfied with single USB port. Check your laptop cooler docs, or the fan itself, to know how much does it pull. To be on the safe side, get a powered USB hub and power supply, and cover POWER and GND pins with duct tape on cable connecting the hub to laptop. E.g. hub + PSU - or you can probably salvage the latter from some old equipment, as long as connector matches and it is 5V 1A+. Or, you can spend some more $$ and get a proper quality hub that isn't backfeeding - then no need to cover anything.

 

Iirc, generally a USB device on a computer will only draw max of 100mA iniially. With a device like a smartphone or other chargeable device, said device will then negotiate with the computer to determine the max mA it can draw (500mA, 300mA, etc.). For dedicated charger devices (like a portable battery pack), the USB data wires are connected together, telling the device to draw asUchida so possible.

As for simpler devices like mice and keyboards, those barely draw any power at all. Your biggest concern should be the cooler, and even then you should be fine if you can dedicate one of the computer's USB port to it. Rest can easily go on a hub.

 

Good to know that!

That was what woried me, I read in a lot of places that cheap power USB hubs can fry themselvs, hard drives and other computer component.

Ill really try tho check if the coller is the main problem because I've been having my mouse and keyboard laging probably because of power needed.



My problem is that I live in Brazil. A good USB power hub that wont fry my computer is really expensive, thats why I wanted to know how much power my peripherals are drawing so I could do a better arrengment and use a non powered USB hub I already have.
I dont have the manuals my peripherals but I guess I'll try to get in contatc with the seller to get the information.
Thank you all!

 

My method for trying to answer this question would be to restart the computer, run BatteryInfoView and then pull out the mains power cable. BatteryInfoView will give the power drain in mW. Plug in each USB peripheral in turn, let the power drain stabilise and make a note of the increase in the power drain. Remove and try the next one. Then, using 5,000mW = 5V (standard USB voltage) x 1,000mA (=1 Amp) it is possible to calculate the power used by each peripheral (subject to it not being a device which causes increased computer activity).

John

 

I just tried running this software and unfortunately, I dont know why, it doesnt show the Charge/Discharge Rate.
Even in the battery log page it only shows a contant rate that doesnt change when I use the peripherals.

 

Did you disconnect the AC adaptor so the battery is being used?

John

 

yes, I also sent an email to the developer inquiering about it