Watts X how many hours in a day the lights are on x 365 / 1000 = x how much you pay per KWH =
Example 24 watts x 12 = 288 x 365= 105120 / 1000 = 105KW x .11 cents per KWH = $11.56 per year
I think i worked out once that just to run my 75 gallon, it costs around $650 a year. You also have to consider that fish tanks will produce heat... which will then contribute to your AC coming on for longer too !
$650 for my 75 gallon & 30 gallon
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Last edited by stevenjohn21; 02-07-2013 at 11:18 AM.