A washing machine will use 400 to 1300 watts, with modern Energy Star rated models using about 500 watts. Click calculate to find the energy consumption of a clothes washer using 500 Watts for 0.25 hours a day @ $0.10 per kWh. This is the same as washing twice a week for 52.5 minutes each time.Click to see full answer. Thereof, what size generator do I need to run a washing machine?The generator must have enough starting watts and running watts to operate the washing machine. For example, 1,600 starting watts and 800 running watts are required to operate a washing machine in a residential setting. A larger generator is required to operate multiple electrical items at the same time.Also, how much power does a washing machine use per hour? Washing machine: around 16p per one hour wash On average, a 6 litre load washing machine takes around 1 unit of electricity – roughly about 16p – to run an hour-long wash. Subsequently, question is, do washing machines consume a lot of electricity? Washing Machines & Dryers At eight loads of laundry a week, the average family uses both the washing machine and the dryer six hours each on average per week. Even with some of the more energy efficient models, the combined cost of doing laundry can add up to more than $115 a year for the electricity alone.Which washer consumes less power?Semi-automatic machines can work under low water pressure. They consume little less energy compared to top-loaders. Front-loading machines can wash more clothes in one cycle and save some more electricity this way. They consume slightly more electricity.