Instructables

How does a green power generator (i.e. wind turbine) hook up to house hold power.

I know the electricity from the windmill gets converted to 120V AC but doesn't there need to be some sort of phase matching with the home AC? The home is still hooked up to the utility grid and the windmill is just meant to offset what is taken from the grid.

110100101105 years ago
to connect it like that you have to use inverter (the thing that converts from batteries dc to 120 V ac) that matches its phase with that of the line a standard inverter does not do that. if you connect the output of standard inverter to other ac source you can get shut down breakers and sometimes blasted inverter you can use a standard inverter if you dont connect it to the mains ac. just hook some of your home to the inverter and some to the external electricity - without connection between the parts
iPodGuy5 years ago
If it was off grid, then the windmill would be charging a battery station. Windmills tied to the grid act just like my solar panel system - the power that comes from them go to my inverters and gets changed to useable power and all of that gets shot back into the grid. What keeps track of how much is used or made is the house's electrical meter.
alchemistdagger (author)  iPodGuy5 years ago
thanks, but I know all that, what I am trying to understand is this: the home/grid AC is running at 60 Hz. if a windmill produces power, has it converted to 120 V 60 Hz AC, doesn't it have to phase match the 60 Hz from the home in order to add the two power supplies together. I would think that if the electrical frequency from the inverter (from windmill) was out of phase from the home, that there would be some sort of frequency cancellation. or am I wrong on this view.
A grid tied inverter is also a power controller and changes the frequency and volts to a range accepted by the grid.

Off grid homes use a separate power controller to pulse power to the batteries at a specified voltage to keep batteries from being overcharged and prevent sulfuring.

Hope this helps!


There are two ways to use solar and wind power to power a home:

One is a grid tied system where the home is still attached to the grid and the power from solar and wind is fed back to the grid using a grid tied inverter.

This requires notifying the power company for permission and installing it according to their directions.

The grid tied systems are popular because if the sun doesn't shine or the wind doesn't blow you still have grid power to rely on and it is possible to run your power meter backwards and either owe no power bill or have the excess credited to your account. Not all utility companies do this!

The second way is an off-grid system that uses batteries to store the power for use in the home.

Solar panels and wind turbines produce DC direct current and it is passed through a power controller and stored in a deep cycle battery bank.

The power can be used directly from the batteries to run dc 12 volt appliances but to run AC appliances you connect an inverter to the batteries that converts the power to AC from DC with a small power loss.

I live off-grid and use both solar and wind power. I have a 350 watt system that cost under $3000 and runs my water pump, lights, TVs, laptop and gadgets.

I use propane for fridge, stove, furnace and OD water heater. Most off grid homes use propane or NG for major appliances so they do not need a large solar and wind system- it saves money!

For more ideas on off-grid solar and wind I have videos and complete plans:

http://www.simplesolarhomesteading.com









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j9sjam35 years ago
You would need a qualified electrician to do this. It costs a lot to do and its not worth playing with the mains yourself, unless you know exactly what your doing.