So I left the Kill a Watt meter in place for 50..56 hours. The tank consumed 1.33 kWH for a total of .0263 kWH per hour. At that rate, the system would pay itself off in 7.65 years. That’s a little bit of improvement on the tank. I think it’s due to the fact that most of the last measurement was taken with the lights off. Still, with that 60w bulb, the payback is coming in under 2.42.
Next measurement will be the computer.