David R Posted August 11, 2008 Report Share Posted August 11, 2008 Trying to work out what the fish cost me per week, according to Wiki "kWh is the product of power in kilowatts multiplied by time in hours". So if I have a 300w heater running for 100 hours a week it will be using 30kWh, which will cost $2.79 (based on $0.093/kWh). Does that sound about right? Quote Link to comment Share on other sites More sharing options...
Luke* Posted August 11, 2008 Report Share Posted August 11, 2008 your calculation is correct however your unit price will be wrong. $0.093/kWh = 9.3c ... so unless you're on a "night only" meter (which only runs 11pm-7am) that can't be unless your power company is about to go bankrupt. more than likely your unit rate is actually $0.193 (19.3c/kWh) = $5.79. have you worked out it's on 100 hrs/week? At 50% of the time it's 90 hours Quote Link to comment Share on other sites More sharing options...
David R Posted August 11, 2008 Author Report Share Posted August 11, 2008 :lol: I hadn't looked at the bill thoroughly and was only using the $0.093/kWh Mercury Energy portion, now that I've added the $0.08/kWh Vector charge my spreadsheet looks a lot worse. Maybe I won't show my other half... The 100 hours was just a nice round number. I have 2 300W heaters in my 300L tank and have estimated one works about 50% of the time and the other about 20% of the time (cold nights and water changes). Its a stab in the dark really, but I can't be bothered working it out more accurately. Do those power usage meters have a memory that tells you how many kWh something has used over a period of time? If so then I might invest in one so I can measure how much power the heaters use. Quote Link to comment Share on other sites More sharing options...
Antipodes Posted August 11, 2008 Report Share Posted August 11, 2008 :lol: Do those power usage meters have a memory that tells you how many kWh something has used over a period of time? If so then I might invest in one so I can measure how much power the heaters use. In a word, Yes. Quote Link to comment Share on other sites More sharing options...
firenzenz Posted August 11, 2008 Report Share Posted August 11, 2008 Thats why my new favourite season is Summer. Quote Link to comment Share on other sites More sharing options...
David R Posted August 11, 2008 Author Report Share Posted August 11, 2008 I think I'm going to move to Florida or SoCal..... Quote Link to comment Share on other sites More sharing options...
SpidersWeb Posted August 12, 2008 Report Share Posted August 12, 2008 For $30 you can buy digital power meters from DSE etc You can also enter the price per kWH and it'll give you the dollars and cents a device has used since it was plugged in. I have one, never actually used it though Quote Link to comment Share on other sites More sharing options...
David R Posted August 12, 2008 Author Report Share Posted August 12, 2008 Cool, I'll check it out. Thanks! Quote Link to comment Share on other sites More sharing options...
Luke* Posted August 12, 2008 Report Share Posted August 12, 2008 I think I'm going to move to Florida or SoCal..... haha yeah man those aussies must have it good esp in the northern areas ay? frenchy? Quote Link to comment Share on other sites More sharing options...
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