? My calculation I already posted is correct (based on 18A load, not 16A). Your calculation above is missing some steps. Where are you getting dollars from? You calculated the load as 3.68kW, then multiplied by 6 hours. That gives you 22kWh, not $22. Multiply by the cost per kWh (11 cents) to get the cost of operation per pump, per 6 hour period: $2.42.if i remember its going to cost about $22 per 6hrs of use. & im thinking 3 pulls per grid, so 20x3=$60. am i figuring right ? ( ex. 16amp x 230v = 3680 / 1000 = 3.68 x 6 = $22 ?