Would anyone mind verifying my math here? I'm trying to estimate the cost of mining for a month under the following assumptions. This would exclude the cost of other onboard system components (I'm running it from my personal desktop).

Assumptions:

-My CPU draws 84W TDP, and my GPU 150W TDP

-I run my system 24 hours/day x 30 days and try to keep things as cool as possible

-local electricity price is $0.1196/kWh

234W of drawn power x 24hrs = 5,616 watt-hours

5,616 watt-hours x 30 days = 168,480 watt-hours-days

168,480 watt-hours = 168.48 kilowatt-hours (kWh)

168.48 kWh x $0.1196/kWh = $20.15

Roughly $20 bucks added to my power bill for a month straight of Z-cash mining? Is this a realistic number or am I off by orders of magnitude? Also am I forgetting any major factors? Perhaps a minimal additional contribution from the increased power draw of my cooling fans...