I've a bunch of questions, I have searched LOTS but I can't seem to figure this out. I hope an expert can answer this for me.
I read that a Raspberry Pi can only output 0.6A for those 4 USB ports in total. So 0,15A PER USB port. (Yes, I know you can tweak it to 1,2 but haven't done that.)
How am I able to power an external HDD of 0,7A an USB 3.0 of 0,9A and an USB 2.0 of 0,6A all at once. That's a total of 2.2A! And then the Raspberry Pi requires an additional 1,1A Which is a total of 3,3A. The power supply that I am using only has 2,5A available (5V) Can someone explain how this is possible?
Shouldn't the Pi shut-off whenever the 2.5A limit has been breached?
Also, if I were to buy an USB-hub with separate power supply and plug all my USBs in that and the hub in the Pi, would that mean that the Pi would output 0A to the hub and the USBs since it's all being powered by the hub? Freeing 2,2A?
My HDD sticker says that it needs 0,7A the port of the Pi can only give 0,15A to that port that my HDD is connected to. How does this thing ever power on? That's a big difference...
Or do my USBs operate at a total of 0,25A? I did read about unit load too. Still doesn't explain the HDD part then to me, unless that thing can run on 0,15A...
Can someone please clarify I've been studying this electricity for 2 days but I can't understand this. All I've read is going against me.