Hi,
I am thinking about extending my wireless coverage by adding a WAP (and a wireless-ethernet bridge) that will be powered by batteries.
The wireless-ethernet bridge will be the client feeding the WAP, so the WAP can be run as a complete WAP and not a repeater.
The power specs for the bridge and WAP are the same:
INPUT: 100 - 120VAC (0.5A) OUTPUT: 5VDC (2.5A)
Stupid question: How do you determine how many watts are actually used? Is this simply by multiplying the voltage with the amperage of the output specs?
Am I adding this up correctly for a 12V battery?
5V x 2.5A = 12.5W12W x 2 (devices) = 25W
25W / 12V = ~ 2.10 AaH (Amps per hour)So, say, a 12V 100A (deep cycle) battery should last ~47 hours if supplying 5VDC (2.5A) continuously? (Well, somewhat less, because of inefficiency.)
Then, later on, I could double that amount of time by adding a second battery and connecting them in parallel.
Am I adding up correctly here? I would, obviously, be using a DC-DC converters in place of the power adapters, not a DC-AC inverter with the power adapters.
Thanks!