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#28
02-26-2009, 02:24 AM
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you can calculate each devices cost and your entire tank cost by taking the watts of each device and dividing by 1000 to get Kw then multiplying by how many hours they are on per day, then multiply by the number of days in the month then by the KWH (KiloWatt / Hour) rate
EG 250W MH 250 / 1000 = .25KW X 11 = 2.75 X 30 = 82.5KWH X (rate) $.069 = $5.69 per month roughly 
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