dam i wonder how much a 400 running 24 will cost
Find out what your electricity supplier charges per kilowatt hour (kwh), multiply it by 24, then divide by 0.6 for a 600 watt, or 0.4 for a 400 watt.
That will give you the daily cost. If you are on a split plan ie 18 hours charged at premium rate and 6 hours charged at nighttime rate, then use the formula above for each rate separately and add the totals together.
eg:
Off Peak is 10c per kwh and Peak is 20c per kwh, so
6 hours at 10c per kwh = 0.60
18 hours at 20c per kwh = $3.60
Total $4.20
$4.20 x 0.6 (600 watt)= $2.52 per day