3 ms·$0.10/kWh @ 300W = $0.1/kWh * 0.3 kW * 720 hrs/mo = $21.60/monthby hnuser123456 6y ago$0.10/kWh @ 300W = $0.1/kWh * 0.3 kW * 720 hrs/mo = $21.60/monthdeleted 6y ago[deleted]