# How large of a wind generator do I need to power my house?

During the summer I use 1300-1500 kwh a month and in the winter it goes down to 5-6.. Kwh a month.

I want to be able to power my house or at least knock my electric bill down quite alot for the summer and almost completely erase it in the winter

6 Responses to “How large of a wind generator do I need to power my house?”
1. billrussell42 says:

Wind turbines (a wind generator is something that generates wind, like an electric fan) are usually effective at 20% of their rated power. That is because the wind is erratic. Wind above or below the design speed causes a much reduced output. So a 10 kW unit will produce an average power of 2 kW. But it could be less, depending on location.

1500 kW-hour per month is a average rate of 1500/720 = 2 kW. Given the utilization factor above, you would need a 10 kW unit for the summer. But you have to pick the power. You can get by with less if you are willing to pay for power if needed.

one configuration is to change your power meter and use a special inverter so you can do a grid tie hookup. Then you sell excess power to the power company and pay them for power when there is no wind. That saves on the cost of batteries (which can add up to a lot). And also handles any high peaks of power.

2. Mike1942f says:

3. Christian says:

Take the 1500 KWH a month and devide by the hours in the month and you get an average power consumption of about 2 kw. this is the average. if you installed a 2 kw generator you should expect to have enough power about half the time.

What you really need to design for is your max power usage. you may be able to find your max power usage by turning everything on in your house and then go watch your meter run.

alternetly, you could probably get away with a generator smaller then your max power usage with the use of batteries.

4. Entang Suratman says:

KWH/month is electrical usage of yours. It can be converted into average KW to specify your wind generator. But you miss peak usage when you use most of your home appliances. The peak usage commonly happens after the sunset (TV., A lot of light, AC and may be you ironing and washing.) You can record the KWH meter during the peak hour for one hour, and that is the generator capacity you have to provide. KWH/H = KW.

5. Ray;mond says:

Power your house without the help of the electric company, will likely cost you double or more what you pay the electric company. Unless strong steady wind is the norm on your property, you should likely forget doing wind generator. Your low winter usage suggest that the house is vacant about 27 days per month in winter? What happens in the spring and fall? You are likely paying a minimum charge, during the very low usage months, so you could disconnect for those months, if the reconnect charge is moderate. With a 1, 2 or 3 KW wind generator, a large battery bank would recharge between visits to the house. A 5 kw inverter would do, except a surge may shut off your inverter, if a lot of other power is being used for other things = only mildly inconvenient = shut off the high power things and retry the inverter. You can then turn on all the stuff that you want except items that need a big starting surge.
When you reconnect the power company; use your inverter only for a few items plus at least one device used daily in the daytime that needs a big starting surge. This tests your system and uses most of the power your wind turbine produces. If the power company is blacked out for an hour or more, you can switch off the main circuit breaker and run your house as you would if the power company was not connected. Do not discharge your batteries below about 12.2 volts as that reduces battery life expectancy drastically. Neil

6. Tech Geek says:

You will need approximately a 2.5kw wind generator. I based this off of 9100kWh for the year with a grid tie inverter efficiency of 90% and wind for 12 hours a day. That should get rid of your electric bill. I say use grid tie as this will save you money not buying batteries and also be able to have power for any surges.

If you wanted to get rid of electric company all together you could get a ton of batteries to create a battery bank and have no electric company at all. Doing this you will have to buy a lot of expensive batteries to store electric your not using at the time. Then when you have a device that creates a surge the batteries will have enough juice to power the surge.

I don’t know your peak current draw, but a 6,000watt inverter will probably work well for you. You can pick them up on amazon. Just be sure to use 0 gauge wire or larger to connect batteries together as well as batteries to your inverter, or you will not be able to handle surges of an AC unit.

I’d recommend about 40 12VDC 105AH batteries, which will give you enough power to provide you with about 12hours of electric with no wind. If you don’t go that long without wind then you can use less batteries.