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Solar electrical systems?

Discussion in 'Environmental Discussion' started by pyccku, Jun 12, 2008.

  1. skruse

    skruse Senior Member

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    1. First do an energy audit of your home. What is your energy demand?
    2. Understand it is always more cost effective to hold onto what you already have vs. "go get more." Conservation and efficiency are the most cost effective.
    3. Look into "Time of Use Metering" that uses a high kWh rate from 12 noon to 7:00 p.m., then shift your electricity use to off peak, 7:00 p.m. to 12 noon.
    4. You can start small, then add more panels as your budget permits.
    5. Act with confidence and knowledge knowing you are part of a "Distributed Power" supply system (vs. a mega centralized power plant) that is climate appropriate.
    6. Look forward to the 2010+ Toyota PHEV Prius. A Liter of electrons is cheaper than a Liter of gasoline and is taxed less.
     
  2. pyccku

    pyccku Happy Prius Driver

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    1. First do an energy audit of your home. What is your energy demand?

    We range from a low of 612kWh in April to 2851kWh in September. That was during a big heat wave; hopefully this year will be better. By far, the largest part of our consumption is a/c. We try to keep it to a minimum - thermostat on 82, ceiling fans running when we are in the room - but sometimes there's not much you can do.

    2. Understand it is always more cost effective to hold onto what you already have vs. "go get more." Conservation and efficiency are the most cost effective.

    Yep, I've started looking into ways we can cut down on our demand so that we'll save energy in the first place, but also so that if we do go solar we'll be able to meet a higher percentage of our needs with a smaller system. Knowing that last year we used 16K kWh and the system we were quoted on makes 10K kWh - the closer we can get to using 10K, the better off we are. I've replaced all of our lightbulbs with the energy-efficient ones, and we just got back from buying a new refrigerator that will use less than half of the electricty that the old one did. We never liked that fridge, but cutting 500kWh from our annual demand is a pretty big thing - almost a month's worth of power!

    3. Look into "Time of Use Metering" that uses a high kWh rate from 12 noon to 7:00 p.m., then shift your electricity use to off peak, 7:00 p.m. to 12 noon.

    We already have it. Ours is 9pm to 9am. We do all of the laundry, dishwashing, etc. in off-peak hours. But a/c and refrigerator have to work during the on-peak hours, unfortunately.

    4. You can start small, then add more panels as your budget permits.

    That's something I'm going to discuss with the guy. The system he told us was for 6K. If I can go slightly bigger with the inverter and then add panels down the road, that might work for us.

    5. Act with confidence and knowledge knowing you are part of a "Distributed Power" supply system (vs. a mega centralized power plant) that is climate appropriate.

    Do I sound confident? I'm trying! :p

    6. Look forward to the 2010+ Toyota PHEV Prius. A Liter of electrons is cheaper than a Liter of gasoline and is taxed less.

    Yeah, I look forward to it but dang, I really love Louise! She's the first car I actually cared about enough to be sad if I had to say good-bye. Maybe when the time comes, we'll ditch my hubby's xB and get the new Prius.


    Oh, and the swamp cooler thing...I would love to have a swamp cooler, but we don't have a good place to put it. We looked into it last summer; we can't put it on the side of the house and the HOA won't let us put it on the roof. Bummer, if we did have one we'd only need the a/c 1-2 months out of the year. We had one on our first house and it was great.
     
  3. tripp

    tripp Which it's a 'ybrid, ain't it?

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    perhaps you could jump a lot more insulation into your house and do the low E window thing. AC alone seems to be bloating out your needs and costing you a lot of money. Finding ways to mitigating that (get creative to circumvent the HOA if you have to) see like they'd be very worthwhile.
     
  4. PriusSport

    PriusSport senior member

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    Good for you. You drive around LA out in the desert, and you see all those windmills--you don't see that in the East--yet. Have had a heat pump for 25 years with electric backup. The electric backup is now cheaper than oil or propane backup.
    Solar conversion is difficult because of cost. Better for new construction.

    We will need more electric power in the future. I don't see how they can avoid increasing nuclear, which has been used safely in Europe for decades. Strict regulation and safeguards are necessary.
     
  5. Nords

    Nords Member

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    Wow, that's an excellent price. For that quote I'd fly a crew over here and pay for their hotel rooms too.

    You might want to talk to local PV users-- contact your local utility or re-post these questions to a local discussion board (or your Sierra Club or Prius Club or wherever you're going to find a number of PV owners). Nothing wrong with that price but there are always references and "wish we had" comments from current owners. You also specifically want to know if their systems are actually producing the KWHrs they were promised by the installer. The installer is probably not lying (and usually not stupid) but they can't do much about the sunshine, clouds, & shadows.

    You might also want to take a look at the credits for doing the installation over two years, even if it's just October & March. IIRC some federal credits may expire at the end of this year or you may have state/utility credits that are different from ours. Most installers are very busy in Nov/Dec as homeowners try to get the credits before it's too late.

    DSIRE: Incentives by State: Incentives in Federal

    I don't know anything about air conditioning but I know about sunshine. Radiant foil insulation on our attic rafters, reflective roof paint, and radiant foil in our walls has made our place a lot cooler. It's the only insulation we have (and really even need), although for A/C you'll probably want something that also reduces external airflow through your house...
     
  6. Tadashi

    Tadashi Member

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    I have had a 3.6 kw system with a 80-gal solar water heater in our house in TX for the last 8 months. If you want I have a spread sheet that will calculate the return on your investment (I attached it to this post I think):p. BTW if you have the roof space you can save a bunch of money on panels that did not meet top standards. ie 180 w panels that only produce 155 w would be sold as 150 w panels and so forth for 160, and 170.

    Edit: The Solar file has an ROI tab. You will have to enter the information for your area and expected system parameters. I also have my data in there for the past 8 months so you can get an idea of what predicted vs actual may look like.
     

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