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  1. #391
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    Default Re: Grid-tied solar

    Quote Originally Posted by Redneck in training View Post
    I just read few days back that US solar market increased 76% last year.
    I was shopping for a solar panel for my RV and was shocked at how much the price has dropped on panels - some now less than a $1 a watt. I guess it is the Chinese flooding the market.

  2. #392
    Elite Member Redneck in training's Avatar
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    TYM 330 HST with FEL

    Default Re: Grid-tied solar

    I think all of them are for less than $1/W. I think the solar revolution just started. Panels with efficiency over 20% just hit the market. Higher efficiency means even lower cost/W and less space for installation.
    The biggest issue is that sun doesn't shine at night so storage or transformation of energy to another media (H2) is the next hurdle to overcome.
    Ladia

  3. #393
    Super Member dave1949's Avatar
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    Default Re: Grid-tied solar

    Quote Originally Posted by Redneck in training View Post
    I think all of them are for less than $1/W. I think the solar revolution just started. Panels with efficiency over 20% just hit the market. Higher efficiency means even lower cost/W and less space for installation.
    The biggest issue is that sun doesn't shine at night so storage or transformation of energy to another media (H2) is the next hurdle to overcome.
    There is a lot of research currently in improved lithium batteries. If a battery capable of powering a typical residence overnight could be about the size of a refrigerator, sit quietly in a corner somewhere, and not cost a fortune, that would be pretty attractive.

    Hydrogen would be good for commercial-scale systems, but maybe too complex for residential use? It could feed a hydrogen fuel cell and produce electricity I suppose if the cost of fuel cells became reasonable.
    "Those were the days my friend, we thought they'd never end ..."

  4. #394
    Elite Member Redneck in training's Avatar
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    Default Re: Grid-tied solar

    There are other more or less mechanical ways to store energy. In example by pumping water to high elevation and let it run down trough a turbine powering a generator. There are quite few of those in operation in the USA (Blue Mesa, CO comes to mind), pumping compressed air underground and use it as combustion air for a gas turbine without a compressor etc. One of those is under construction in Iowa. Heating or chilling larger amount of liquid and then use it at night for heating or cooling etc.
    Ladia

  5. #395
    Veteran Member yelbike's Avatar
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    Default Re: Grid-tied solar

    Quote Originally Posted by Redneck in training View Post
    There are other more or less mechanical ways to store energy. In example by pumping water to high elevation and let it run down trough a turbine powering a generator. There are quite few of those in operation in the USA (Blue Mesa, CO comes to mind), pumping compressed air underground and use it as combustion air for a gas turbine without a compressor etc. One of those is under construction in Iowa. Heating or chilling larger amount of liquid and then use it at night for heating or cooling etc.
    Although your right, the examples you present have been around for many years, they still remain very inefficient. A lithium ion battery is much more efficient and would be a very interesting method of storing the days sunshine for use off peak.
    Carefull what you aim for, Aim for nothing and you will achieve it with amazing accuracy.

  6. #396
    Elite Member Redneck in training's Avatar
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    Default Re: Grid-tied solar

    It is not always about efficiency it is about storing large amount of energy instead of wasting it or shutting down the source. Water pumping systems can absorb powers in range up to hundreds MW and can be started in minutes. I don't know the efficiency but it is better than battery charging for sure. It is around for long time so it is proven. That is the beauty of it.
    Batteries are OK for home use or local smaller scale power storage.
    Ladia

  7. #397
    Super Member dave1949's Avatar
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    Default Re: Grid-tied solar

    Today the system hit the model prediction for April, yahoo. Whatever it generates for the remaining six days of this month will help make up for Feb. and Mar.

    I am glad to see the output is within reason of the model prediction.
    "Those were the days my friend, we thought they'd never end ..."

  8. #398
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    Default

    Quote Originally Posted by dave1949 View Post

    I am glad to see the output is within reason of the model prediction.
    It inspires confidence in the entire project.
    Which is bigger?: a) $100 per month since the Big Bang or b) the US National Debt.

  9. #399
    Super Member dave1949's Avatar
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    Default Re: Grid-tied solar

    Quote Originally Posted by EE_Bota View Post
    It inspires confidence in the entire project.
    Yep. Basically, if that model prediction is wrong, it's garbage in, garbage out for the whole thing.
    "Those were the days my friend, we thought they'd never end ..."

  10. #400
    Elite Member Redneck in training's Avatar
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    Default Re: Grid-tied solar

    America now has more solar energy workers than coal miners : TreeHugger

    Interesting statistic. No black lungs either.
    Ladia

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