Solar Power

Archive for November, 2009

Hello! I have been looking into an off the grid plan, but not using any batteries.
I am planning to use micro hydro, wind, solar and instead of batteries I will be using flywheel storage technology. Flywheel storage technology is connecting a motor/generator to a flywheel, to recharge you turn on the motor, and then to use the energy you use the inertia of the flywheel.

Basically we need to synchronize the AC power from the generator in the micro hydro system, the generator in the wind turbine, and the generators in the flywheels, and the power from the inverter that’s connected to the solar panels. Is it possible to use 1-phase generators, since this will be a home system and I will only need 1 phase, or should I use 3-phase, and how would I split those three phases.

What are asynchronous generators and how do they work?

P.S. Does it make a difference of what frequency I am using, besides the fact that some stuff won’t work on one frequency or the other? If yes, what would be the difference between a 60 hertz and a 50 hertz system.

Thank you very much for your time.

Please do not comment on my decision or anything, I just want an answer.
Also, the wind turbine is not necessary, and if possible, I would like to not use rectifiers and inverters.
There probably will be a small biogas generator operating too. It will run at a constant speed. I can regulate the water flow.
I will start up the entire system at the proper frequency with a small generator (from the store) and then let it go on it’s own. Will that work, instead of connecting to the grid?

You can have a single phase power system. As a matter of fact it would be better when you have a dc solar and inverter system.

To synchronize a power system you have to match frequency, sequence, voltage and phase, slowly.

Asynchronous generatros are induction motors which are driven past their synchronous speed and start developing a braking torque and supplying power into the grid. They need to be excited by the grid, but difficult to run off the grid.

50 or 60 hz choice: I would pick the one that is cheaper.

From the level of your questions I take it you have NO CLUE of what you are getting into. Nothing of what you are trying to do is easy, nor simple, nor cheap, or necessarily feasible.
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The more systems you have, i.e., biogas, solar, diesel, batteries, and so on, the more maintenance tweaking and tuning you wil have to do. Even a simple diesel generator has its quirks. It will be a full time job.

Then, you have to make them work together. On the grid! It can be done, but it is a very tall order. In the end, you will kick the whole pile of junk sky high and get an of-the-shelf system.

Of all the options, I prefer wind, with batteries and single phase inverter. Wind ain´t cheap, and it is noisy, but it is cheaper and simpler than other options, and you can connect to the grid.

"Micro hydro" (not sure how big that would be) will still require some kind of a dam. Not easy to operate either.

Use biogas just for heating and cooking.

Even so, you will have your hands full.
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Im just curious as to if this is even possible. How much total power is used on average by the US? How much would it cost to make this many solar panels or other systems to make electricity from the sun? Im trying to figure out an estimate of how much it would cost to get all the electricity used in the us from Solar Power.

15Watt 38in x 13in = 494sqIn Scale this up by a factor of 1 million

15Mega Watt = 494,000,000 sqin

494 000 000 square inch = 78.75 acre

Sofar 15Mega Watts from 1,000,000 panels needs 78.75 acres lets scale this up to equal SqMiles (640 acres = 1 sqMile) Note the area doesn’t consider additional room between the panels. You will need additional space so you can walk between them so as to be able to service them etc.

15 * (640/78.75)= 121.9 MegaWatts / SqMile
1000000 * (640/78.75) = 8126985 * $100each = $812,698,400

So far that is over $812 Billion and you have enough wattage to replace one nuclear power plant.

Your going to need more land than 1 sq mil, you will need additional hard ware to mount the panels.
So you can easily quadruple the cost and area requirements to $3.248 trillion(not counting the purchase of the land) on 4 square miles with 32,507,940 (32.5 million) solar panels

Why quadruple the cost? Remember that the panels are only exposed to 1/2 day worth of light so you need at least twice the capacity to store half of what you generate in batteries for night time use. And this is being generous in assuming that you get 100% efficiency and no cloudy days. The additional cost of batteries, wire , solar trackers etc are only partially covered in this estimate. Then you will have maintenance costs to keep the panels operating at peak performance and replace damage. (imagine what a hail storm would do)

And all of this to replace a single 120 mega watt power plant.

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