SanJoseGreenHome.com

Solar Panel Supply Will Far Exceed Demand Beyond 2012 – Forbes Mag

The cost of a residential solar system has come down 33% since 2008 improving financial payback¹.  However, have you ever asked yourself about the energy payback of the solar panels?  Energy payback refers to the length of time it takes a solar system to produce, or payback, the same amount of energy required for its manufacture, transport and installation.  A 2011 study² found that it took about one year for a solar system to generate the same amount of energy required to manufacture, transport and install that solar system.  Seven years earlier, in 2004, the US National Renewable Energy Lab³determined that it took three to four years for energy payback.  In just seven years the energy payback is significantly faster.

We can expect the future energy payback time to be even better.  For example, recent manufacturing breakthroughs could reduce the amount of pure silicon used in a solar panel by up to 90%.  Creating pure silicon is an energy-intensive part of making a solar cell, so reducing the amount of silicon used results in a faster energy payback. 

The energy payback calculation also depends on the location of the installed solar system.  In the 2011 study, the PV system was assumed to be in a climate similar to the Midwest or East Coast.  In the Bay Area a solar installation with little shade can be expected to generate about 20% more energy per year.  So the energy payback for a solar system in the Bay Area would be closer to 10 months.

The useful life of a solar PV system is (more…)

If you had to imagine the greenest home in California, what images would spring to mind?  Would it be some clay, dome shaped structure perfectly exposed to solar angles, or maybe an ultra chic, boxy looking modern beauty with massive windows facing a valley?  What if I told you that this home sits on a pretty standard residential street in Santa Clara and an untrained eye wouldn’t even notice any “greenness” about it if they drove by?

Meet the “Bluebird” residence.  This Earth Bound Home’s show house  is also the personal residence of founder David Edwards.  Rated as the Greenest Home in California by Build it Green organization, the original 1400 sq. ft. ranch style home was added to and remodeled, creating a 3100 sq. ft. 4 bedroom, 3 bath home with an office and workout room.   Awards range from Acterra’s Business Environmental Awards Built Environment Award to Build It Green’s South Bay Best New Home award for the 1996 Green Home Tour. Come with us on a video tour to explore all the ingenuity, design and careful choice of materials that went into this project.  (Also see a list of “green” features below the video.)

This home’s many green features include:

• Small 2.7 kw Photovoltaic solar electric panels provide all of houses electrical needs
• Solar thermal renewable energy systems
• An inexpensive and no maintenance Grey water system waters the only plants in the entire landscaping that require water, the clumping Bamboo.
• A 1400 gallon underground rainwater cistern collects rainwater every winter
• All FSC wood framing and FSC certified Brazilian Cherry Flooring
• Home built with Structural Insulated Panels(SIPs)
• 65% more efficient than Californias’ Title-24 Energy Efficiency requirements
• $155/year gas bill, $4/year electric bill, $132/year water bill
• 93%  recycling and reuse of building demolition debris
• Half of all windows were purchased from salvage yards, saving over $10,000 over new windows
• All doors on the first floor were salvaged, saving $3,000.
• All trim throughout the house was salvaged from old redwood decks, fences and the siding on old houses. It was milled on site and the shavings used as mulch on the landscaping.
• New One Lawn Synthetic Lawn contains no heavy metals and requires no maintenance or water. None of the landscape requires supplemental water and saves approx. 50,000 gallons of water a year.
• House uses 31,285 gallons of water a year, for 5 people. This is approx 84% less. than the average household uses(~110 gallons per person/day- including irrigation)

Photo and home description courtesy of Earth Bound Homes

When most people think “green” homes they imagine solar panels and fancy energy saving gadgets.  It doesn’t have to be this way.  We invite you to explore with us a passive solar home in Saratoga (Bay Area) designed by a local architect Hari Sripadanna.  The home has achieved a LEED Gold rating and truly stands as a model for sustainability in our community.  After all, Hari bought parts of his house on Craigslist! 

Obviously, we could not cover all the fascinating details in the video so if you want to learn more, please read Hari’s comments and see design plans right below the video.  Enjoy.

by Hari Saripadanna (parts of the article was originally posted on the GAB Report):

With increasing popularity of green building and passive solar design, it is important to understand that sustainable design is more than a collection of credits. The key is to create synergy between building systems and practices that multiply each other’s benefit. One can create more value simply by choosing two or more complimentary sustainable design elements that play off of each other. The combined effect is more than the benefit when these design elements or systems are used alone. 

I would like to share with you some synergistic concepts used in the design of my house and show you how (more…)

So do green homes cost more? When comparing construction costs of green homes there seem to be all sorts of figures floating around.  Some builders say it does not cost much more to build sustainably, and some say it could cost anywhere from 5-20% more to build a truly green home.  Much of those added costs however, can be recouped via numerous rebates and long term operational costs as in the case of this newly build home in Menlo Park.  Come with me on a tour and meet Bill Lacs from Lacs Design and Construction and see this newly constructed property that boasts many elements of sustainable design and technology.  Perhaps you will be surprised why this home owner decided to spend a “few” extra bucks at the end…

This was fun.  A beautiful day on a roof of an Eichler home in San Jose (off Meridian and Curtner).  I met up with my friend Jarom Ferriante and learned a few cool things about solar panels and foam roofs.  This is a home of a crafty clay artist – Harriet, who’s art is shortly featured in the video as well.  Hope you enjoy!

Jarom can be found on: www.dura-foam.com
More of Harriet’s art is featured on her website: www.AcrylicAndClay.com

Here is a great example how one can take an older home and make it more energy efficient with an element of smart design.  These home owners in San Jose could have built this sun room addition in an old fashion way but instead, they decided to incorporate a passive solar element that not only made their home more comfortable but also chipped off a few bucks off of their energy bills.  You will also learn a few more benefits of a cool roof and see a couple of them in action.

The technical info is fun and educational, however, your favorite part might just be the very end, where Sigmond shares a message with us all from his heart.  Enjoy.

If you have any questions for Sigmond feel free to leave a comment here or give him a call direct at 408-353-6727.

In a market where hardly anyone is building green in San Jose, this newly constructed house in Milpitas area stands as a monument of energy efficiency and inspiration.  

It is about 35% more energy efficient than a standard home and prides itself on green elements like engineered lumber, radiant barrier roof, solar water heater, energy star furnace, extra thick insulation, excellent indoor air quality and much more.  

Come with us on a video tour and discover for yourself what makes this property truly unique.

This beauty is a five year project by Green Earth Construction, a Milpitas based and family run company.  Sylvia Leung and her husband had a vision to go green 15 years ago and are finally able to marvel at the fruits of their labor.  In addition to what you’ve seen on the video, keep in mind that the home is wired for solar and if one decided to invest into solar panels, one’s utility bills for the most part of the year could be virtually zero.  Now that’s a good number, isn’t it? 

Building green normally commands higher costs so perhaps the most pleasant detail about this home is that when considering a dollar per square foot basis, the home is priced comparably to a 25 year old home.  If you like more details, you can find all the info under Featured Listings on http://GreenHomeParter.com.  Feel free to contact me directly with any questions. 

A small PETE device made with cesium-coated gallium nitride glows while being tested inside an ultra-high vacuum chamber. The tests proved that the process simultaneously converted light and heat energy into electrical current. Credit: Photo courtesy of Nick Melosh, Stanford University.

Solar energy, more commonly defined by the energy geeks as “radiant light and heat from the sun”, continues to be harnessed for energy production. As you may be aware, most accountable renewable energy invokes the following:

• Solar Radiation
• Wind Power
• Wave Power
• Hydroelectricity
• Biomass

The problem is, only a fraction of the radiation gathered from the sun is really used.

Scientists have always used both light and heat from the sun to produce energy, however, they hadn’t yet discovered a way to efficiently utilize both simultaneously – Until now!  A device out of Stanford University is promising not just one production of the solar energy but two by being able to harness the power of both light and heat.

A Photon Enhanced Thermionic Emission device, or PETE device, is not only a state of the art technology but could potentially reduce the costs for the production of solar power to the point of where it could be a real competitor against oil as a source of energy. This is great for two reasons: 1) the environmental aspect of having solar power being a big player in the energy game is huge considering that it’s a renewable and clean energy source and 2) therein lies a real competitor to the oil industry. This is not to mention it also could open the door to (more…)

OK you tech geeks out there who like to build your own stuff, you must have considered building your own or shopping for used solar panels by now…. Why buy used solar panels?  If you are trying to save money on your residential solar electricity project, used solar panels may be a good investment.  Not only can they keep your initial cost low, but you will also be decreasing the waste at your local landfill by recycling.  But not all used solar panels can be effectively reused, so here are some tips to keep in mind before you buy.

What to look for when buying used solar panels

The ideal used solar panel can look almost new.  The glass will be clear, dry and intact with no cracks or holes.  The frame will be square and sturdy, and the solar cell connections will be securely soldered.  Older panels will typically be larger and heavier than the newer models that output the same amount of electricity.  But if the used panels are in good shape, the lower price will offset any size or weight disadvantage.

Check the electrical output from used solar panels

Don’t rely on the electrical output printed on the factory label.  Instead, use a multimeter and check the panel in direct sunlight to find out what its real output is.  The capacity for solar panels that have spent their lifespan in direct sunlight tends to degrade over the years.  But the decrease in output may not be significant.  A panel that is rated at 22 watts might only produce 18 watts after 20 years in the sun.  But if the price is right and the capacity is enough for your project, it could still be a good deal.

Where to find used solar panels

The best source of used solar panels will be one that is close enough that you can visit in person to inspect the panels for damage and electrical output (dig through Craigslist).  Also, try (more…)

These are the tips that keep coming up from a few solar pros in the community.  They can be common sense but tend to be overlooked by most folks who are pondering installing a solar panel system:

1. You can save money by learning about solar energy yourself

Now that solar panel parts are readily available for purchase on the internet, it really is possible to save money by building your own solar panels.  Build a few to power small battery powered electronics equipment like your laptop and cell phone.  Use those project to learn about how solar energy works, and to find out if you enjoy the process enough to tackle building them on a larger scale.  If you find you enjoy building solar panels, design a system for larger scale solar energy applications. 

2. Solar energy systems are scalable 

Many people think that in order to use solar power in their homes that they have to build and install a complete solar electric system that will supply all of the electricity that they now use.  But that’s simply not true.  You can start off by using smaller solar panels to power outdoor lighting or to light the inside of your garage.  Or you can install a small grid-tied solar panel system to offset part of the electricity that your family uses on a daily basis to cut your energy costs and reduce your carbon footprint.  Later you can add more solar panels and eventually generate enough solar electricity to be energy independent or even sell electricity back to your local utility company. 

3. Do an energy audit before you (more…)