300w x number of hours = kwh
kwh x price of electricity = cost.
it depends on how long theyre run for and how much power costs. if you ran them for 12h and electricity is 8.5c per kwh like it is here then:
300 x 12 = 3600wh or 3.6kwh. 3.6kwh x 60 days = 216kwh
216kwh x 0.085$ = $18.36 this doesnt include transmission charges and other fees.
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