MagicWolf :
Title says it all prety much... How much electricity it makes and how much will i have to pay at the end of the month ? My router is TP-LINK Archer C2 . ---- 12V / 1.5A
Volts * Amps = Watts. So (assuming your router was drawing max power) 12 V * 1.5 A = 18 Watts. In reality, it'll draw less most of the time. A router is basically a mini computer (usually running Linux), and only runs its CPU at 100% when its heavily loaded (lots of connections, doing encryption, etc). If you want to measure exactly how much power your devices are using, buy something called a Kill-A-Watt.
If you pay the U.S. average of 11.5 cents/kWh for electricity, by a coincidence this works out to almost exactly $1 per Watt if a device is left on 24/7 for...