Roughly eight degrees, 30w times the daily use of time, and then multiplied by 30 days a month, is the monthly electricity consumption, if you want to calculate the number of kilowatt hours, then divided by 1,000 is the number of kilowatt hours of electricity in a month. According to the daily use of 8 hours, you should theoretically use 7.2 degrees of electricity, plus the loss of about 8 degrees.