Hello; A few weeks ago I took part in a thread discussing the cost to operate equipment. I have a small meter and decided to test the cost of some of my equipment. I set the meter up and plugged into it an Aqua-Tech 30-60 HOB power filter. The measure started at 2:30 PM on November 8, 2012. I checked it today(12-1-2012) at 9:41 PM. If my count is correct that is 23 days. The power filter used 3.87 kWh in that time. It drew a steady 0.17 amps if I read the meter correctly. At 12 cents per kWh it calculated a cost of 46 cents. I have not run the numbers to check the meter, but if this is correct it cost two cents per day to operate this particular filter. I will reset the meter and test a different piece of equipment.

Thanks for the feedback. Do you know the wattage rating for the filter? If so, it's an easy calculation (wattage rate) / 1000 gives kWH Multiply result from above by 24 gives daily kWH used Multiply by your electricity cost ($ per KWH) gives your daily cost.

Lights are easy. It's the same calculation for all electrical devices. Lights, instead of multiplying by 24, you multiply by the hours you have them on. Heaters, I assume mine are on for 8 hours a day (about 30% of the time)

Hello; I checked the meter just now. It is giving a reading of 6 for what the meter terms active watts. The spot readings this morning were- W (active watts) = 6 while varying between 5 and 7 but most often on 6. VA (apparent power) = 16 There is no explanation for this unit in the instructions. V (voltage) = 120 Hz (hertz) = 59.96 PF (power factor) = 0.31 to 0.40 There is no explanation for this unit in the instructions. Tariff (cost of electricity per kilowatt hour) = 12 cents. This is set based on an average from my bill.

((6/1000) x 24) x 0.12 = $0.017 per day (1.7c) x 23 days = $0.397 So the $0.46 is probably about right if it fluctuates a little Some more info: http://en.wikipedia.org/wiki/AC_power#Real.2C_reactive.2C_and_apparent_powers http://en.wikipedia.org/wiki/Power_factor