Archive for the ‘Wind Turbine’ Category
May 25, 2008 – Skystream Summary
Doesn’t she look good up in the air? I’ll try to use this post to summarize some of the most-commonly asked questions about the Skystream. It is on a 70 foot tower (although they are commonly mounted on 35 foot towers in more crowded locations).
The machine is connected to the utility grid so excess power goes back to the grid (for example, on a windy night when our home load is low). The grid intertie leads to a couple of things people don’t immediately think about – when the grid goes down (when power goes off) so does the turbine. Like a generator, you don’t want current going back down the lines when linemen may be out repairing the lines. Nor does this unit have batteries. If you were in a remote location, far from the grid, that may be an option, but the batteries add substantially to the cost and only last about 10 years, so that configuration is not nearly as “green” as the straight grid intertie.
The unit recently had a software upgrade that changed the top speed before automatic shoutdown from 27 mph in the old one to 30 mph in the new one. It may seem like a small difference, but each time a gust goes above the upper limit, it turns off for 15 minutes before retesting the wind. So, if there’s a 25 mph wind blowing, a 29 mph gust won’t stop it and there is so much more power in the higher wind speeds that the latest upgrade has improved some installations by 20%
There’s also an optional RF USB device that you can plug into your computer and get a read-out of all the data coming out of the turbine. Eventually, the company would like to get this info via an internet connection where they could troubleshoot many potential problems without lowering the tower. Those units have recently been upgraded and the installer wants to wait a bit before I consider getting one to make sure all the bugs are out first. I do find myself going out quite often to look at it and the last few days have been very windy and it has been too windy numerous times.
One thing that struck me is that in a strange way it makes me much more conscious of my energy use – It’s fun those times the household load is lower than the turbine production and electricity goes out into the grid. Like the Prius drivers in the mpg drive challenges, it makes you look closer at the electricity you do use. And it is a treat to know that sometimes the computer is being powered by 100% clean and quiet wind power!
So in a way, I do get more enjoyment than the simple economic payback the turbine provides. I like that what used to be a monthly hole (paying the electric bill) now goes towards paying for a capital asset. Anytime you can convert a monthly payment into building equity (in this case, future “free energy”) it’s good for the long term.
I like the way it looks when you drive up the road to the farm. Like may things, I imagine the first few that go up, people think you might be a bit crazy – but after 5, 10, or 15 go up, then people start wonder what they are missing out on! We’re the third one in our county, so we’re on the way.
Today’s drudge job was piling the excavated soil back on top of the trench. Anytime you move wet soil by hand, it isn’t a fun thing, but in today’s heat and humidity (85 degrees, dew point in the low 70′s) it was less fun, but since there is a tornado watch and flood watch out for tonight, I thought it would never be easier or better than now.
May 21, 2008 – Final Connections for Skystream
Nothing nearly as exciting as yesterday’s tower raising tody.
Making the trench to run the underground wire from the tower to the utility pole.
The trench from the utility pole and along the shed.
The other half of the trench. I’m including these more for my own records so years from now I won’t have to say “Now where did that underground wire go when there is more building or trenching on the farm?”
Unrolling the wire along the path.
Todd’s working on the prep work for the connections at the base of the tower.
Local master electrician installing the connections on the utility pole.
A new meter reading 0!
one year ago…”Walkin’ the Dogs Down a Country Road”
May 20, 2008 – Up, Up and Away!
Today was day two of the wind turbine installation.
Here’s Linda a GJ checking out the turbine blades just out of the package.
Everyone want to get in on touching the blades that will be spinning high in the sky in a few minutes.
This is the main unit of the wind turbine. This is the “magic box” where the energy from the wind gets transferred into electricity.
Here the pieces of the tower are clamped together with a collar.
Lining up the layout of the tower.
This picture shows it all – the blades and generator in the foreground and tower and gin pole behind them.
Mounting the skystream to the tower. The green rubbery things are noise dampers to help decrease vibration noise from the appliance (the wind turbine itself is a UL listed appliance, making grid connection almost like plugging in a refrigerator).
There’s lots of rigging to do to attach the tower to the cement foundation tie-downs.
Here a ladder is being used as a gin pole to raise the gin pole. The gin pole is used to help raise the tower by providing a leverage point.
Pulling the gin pole into place.
The gin pole up and in position. This pole is half as tall as the tower and as the tower swings up, the gin pole will swing down, creating a “flying L.”
Here’s the fun part, installing the blades on the tower.
The blades get installed by turning them backwards onto the turbine.
Everyone’s excited as the tower begins to lift off the ground. It just so happened that everyone was home when the tower went up!
Here you can see the gin pole to the left going down and the tower to the right going up.
The tower about 1/3 of the way up.
Check out all the rigging as the gin pole and tower continue the climb towards the sky.
The tower almost in position!
Ta-Da! The tower is up and in place. Tomorrow the trenching and wiring take place to make the connections to the house and grid.
one year ago…”Raccoons Make Poor Electricians”
May 19, 2008 – Wind Turbine Assembly Day 1
Today, the wind turbine tower assembly began!
Here’s the automatic pipe cutter doing its job on cutting a pipe to length. Last week five 21 foot long pipes were dropped off at the end of the driveway and I moved them closer to the turbine with the tractor. The pipes are heavy – about 375 pounds each!
Applying paint to the pipes.
Cutting the guy wires for the towers.
There’s lots of drilling in the pipes for brackets and various other connecting pieces.
Moving the pipes that will be part of the tower assembly into place. I thought this was an easy and clever way to move a very heavy piece of tower.
Working on the assembly of the tower to one of the footings. Tomorrow, there will be more to report!
one year ago…”Trees All Tucked In”
April 30, 2008 – Wind Turbine Foundation Poured!
After the 3rd scheduled attempt, today was finally dry enough to get a cement truck with 5 yards of cement back to the wind turbine site without sinking out of sight.
Todd and James set the layout for the tower and four guy wire supports. A perfectly flat site is ideal, but hard to find, even in Iowa.
Setting the auger in the appointed location to dig out the first footing.
Great fertile, black Iowa soil coming up from the deep.
Setting and leveling the form for the footing.
Martin takes a peek down into the ground.
All five holes are laid out and dug out, waiting for the cement truck to arrive.
The bottom 1/4 or so of the hole is filled with cement.
The rebar form is set into the hole.
Cement is tamped in as the hole fills up.
Final finishing and troweling of the top of the footing.
The tie-down bolt for one of the guy wires is set into the footing.
The finished footing. Now we wait for 30 days or so for the footing to cure before arranging a time for the tower to go up.
It was a bit of a symbolic day to install the wind turbine footings as it was also the day the Iowa Utility Board approved the construction of a coal-burning power plant 15 miles away from us. The permit did come with some aggressive conditions, including 10% biomass fuel in the plant, and a 25% renewable portfolio for the power company by 2028 and 10% before the plant is built.
one year ago…”Blossoms at Sunset”
April 2, 2008 – Old Silver Maple Makes Way for Wind Turbine
I got a call a few days ago from the wind turbine guy saying that dependent on weather, April 11 was the day to pour the foundation for the wind turbine. Amazing as it may seem for an Iowa farm, we had a difficult time siting the turbine on our property because of all the tall trees, the 70 foot buffer from the edge of the property, and needing it reasonably close to the house. We eventually chose a site with a full northern and eastern exposure, good western exposure and poor southern exposure. I later found out that the most common wind direction is from the south, although the N-NW quadrant is the most common quadrant. In order help out the southern winds, we opted to take out one old silver maple tree and to place the turbine in the path of the hole in the trees.
Here Martin plays on the trunks of the recently felled tree. I called in a professional to cut the tree down as one main trunk was leaning towards a building and I imagined three possible outcomes (presented in most likely order of possibility). 1) tree falls wrong way 2) chain saw gets stuck in tree 3) tree falls right way.
This shows the view of the tree before it was cut.
The view of the sky after the tree falls. Now it is my job to cut it up into firewood and haul the branches to a bonfire pile.
