solar power

I have been trying to find a good mobile solar power trailer for awhile now... most of the companies just don't build a trailer that will produce and store the kind of power I've been looking for in a mobile package. However I've fallen in love with GreenTow. A solar trailer company that has actualy built a usable, powerful trailer! I will be recommending this new unit to all who inquire about mobile solar options!

     Green building now offers so many material and design alternatives sometimes it can be overwhelming. Today I would like to run through some of the competing benefits of installing a solar vs a living roof. This would seem to be fairly simple and straight forward but actually many factors are involved. Let's stick with the purely environmental benefits.

-The idea with solar power is that the power you produce on your roof doesn't have to be produced at a coal fired plant or by some other harmful means somewhere.

-The idea with a living roof is little more nuanced- in that you are recovering the space for flora (carbon reduction) which has been displaced by your residence, improving your insulation, cooling your roof, all while mitigating the urban heat island effect.

     So what is actually more beneficial for the environment? Guess what- It is somewhat a matter of perception and is very involved if one is trying to quantify. It comes down to a complicated equation. (doesn't it always?)
First you have to figure out how much power your hypothetical solar roof will create over the course of it's lifetime. Then you figure out how many emissions would be produced if that power was created via conventional means. This is how many emissions aren't being created because you aren't consuming the power that would have necessitated their creation. However the production and disposal (or recycling) of solar panels (and the energy required to do so) creates it's own set of emissions which must be subtracted from that original total-emissions-avoided number. So what your left with is the total amount of carbon emissions which aren't being created due to the total lifespan of your solar panels. This emission reduction is the environmental benefit of your hypothetical solar roof.
     On the green roofs side you must calculate the entirety of carbon emissions and pollution which are being breathed and processed by your rooftop plants in the course of your roofs 40 to 80 year lifespan and ad to that the carbon emissions avoided from the energy savings reaped from your insulatory and roof cooling benefits. The complexity of variables such as plant type and energy-use-avoided are staggering.
That is why I pose the conclusion that it simply isn't generally feasible to quantify/compare the 'exact benefit' of these two alternatives because there are so many ancillary factors involved. There are a few definite things to consider though when making your choice;

•  A living roof is going to be more beneficial in an urban setting in the sense that it provides a place for plants where there is none. This is also where the "urban heat island" exists. (not to mention storm water mitigation, air quality improvement and aesthetic value)

•  Foot per foot over equal time periods the emission reduction/avoidance is probably greater from a solar roof when you consider how that energy might otherwise be produced in the current social environment. (see next bullet) On the other hand theoretically this energy can also be produced elsewhere or by other renewable means whereas the flora that is able to grow on a living roof in a city would otherwise have nowhere to grow.

• So many little factors are involved that you really need to consider how optimal your location is for either or both. If your in a sunny rural area (with high energy prices)solar may be the way to go. If your in a predominantly cloudy urban setting then your a great candidate for certain living roofs. One thing to consider is that if your just going to be using much of that solar energy on extra power for air conditioning or heating, then a living roof might be just as good in terms of 'cutting out the middle man' and naturally keeping your house a little cooler, and/or better insulated.

I hope this was helpful and as I am not an environmental engineer or scientist I have much to learn about this overall issue as well. Please don't hesitate to comment.

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Green Open House Tour: Green Retro-fit: Built in 1818 and renovated with a grant from the state, one home on the Green Open House Tour now features modern green building systems.

The NESEA (Northeast Sustainable Energy Association) is hosting an open house on Saturday, October 4, from 10 am to 4 pm. The organization has coordinated with home owners and facility managers to provide access to numerous green buildings. Visit the site to see if there is an open house in your area and drop in to ask questions and see the installations that make new and remodeled homes more energy efficient. Just click on the map search, enter your zip code, and click GO. You can also search for projects that involve a specific type of green feature, like a geothermal heat pump, grey-water collection, or LEED rating in the drop down menu at left. I’m going to visit a home built in 1818 in Andover, MA that exhibits grid-tied Photovoltaics, a geothermal heat pump, a tankless water heater, and an alternative fuel vehicle for daily use.

This post was submitted by ThinkDwell. Visit Our Blog.

Still dreaming of a solar powered house but think you can't afford it? Even with State and Federal assistance, installing a full solar system on your house can run you upwards of $10,000, depending on your location.

A new collection of companies are taking a lesson from the auto industry and are renting solar panels to consumers. Based out of San Francisco, Sun Run is one of the key companies in this new solar trend.

But just how does it work? Sun Run's solution is the first all-inclusive residential solar electricity package, offered for less than your current electric bill. You will lock in a below-market rate for the electricity the panels generate on your roof, and you can relax knowing that Sun Run will optimize, monitor, and maintain the system they install at no extra cost.

Such a sustainable and affordable option was one we couldn't resist investigating. Sun Run President Nat Kreamer was nice enough to take some time to chat with Building Green TV about his unique company and everything they offer for customers. Keep reading for details about Sun Run's beginnings, actual customer savings, expansion plans, and solar misconceptions. This is one interview you won't want to miss!

Preparing to install your first set of solar panels? Wondering if you are harnessing all the sun's energy that you possibly can? A new device from California-based Solmetric stands to help both residential and commercial solar power users get the most from their investment.

Also useful when designing the layout of new construction or remodeling projects, the Solmetric SunEye is a "hand held electronic device that allows users to instantly assess total potential solar energy given the shading of a particular site. Identifying the shading pattern early in the process reduces the expense of system and home design and improves the efficiency of the final system or house," according to the Solmetric website.

Release just last year, the SunEye was recently chosen as one of BuildingGreen's Top 10 Products for 2007. Chosen from over 200 products being reviewed by the website, the SunEye joins fellow BGTV favorite LED light from LLF Inc.

An easy-to-use interface and USB connection for data transfer to your computer makes the SunEye simple for all users. What else does this swank little device do? Here are a few more of its efficient features:

+ Integrated electronics plot solar exposure at that location.

+ Users can edit images, simulating the removal of obstructions such as trees or structures.

+ Shading percentages in monthly, seasonal, annual, and multi-skyline averages can be determined in the field or uploaded to a personal computer via USB data cable for further analysis, reporting, and printing.

+ The Solmetric SunEye automatically generates reports for sales quotes and solar rebate applications.

We posted about the Solar Decathlon last week, and now we're back with the winners (which were just announced at 2pm EST)!

So, with no further adieu -- first place goes to: Germany's own Technische Universität Darmstadt!

The team scored big by developing working relationships with other German companies, such as Bosch, and integrating those technologies into their solar experiment. The house will now return to Germany where it will serve as a solar power plant as part of the university's "Solare Lichtwiese" (or, Solar Campus project).

Read all about the house here.

Meanwhile, second place went to the University of Maryland, and third to Santa Clara University.

Read up on all the amazing entries at the 2007 Solar Decathlon web site and view photos of all the homes here.

Image via Jim Tetro, Solar Decathlon

When we talk about green building and green living, we often talk about materials that we can buy or practices that we can adopt in our home -- and that's because we truly believe that every little bit helps and that every person who decides to green their home in a responsible way makes a difference.

We don't talk about legislation very much; however, just this morning we received an email from iPower (no it's not a Mac product; it's a renewable energy corporation ) about the Vote Solar Initiative.

Long story short, Vote Solar's goal is to bring solar energy into the mainstream through policy. They're currently, and rightfully, all riled up because there is a federal solar bill in the works. The goal of the bill is, ostensibly, to make solar power more affordable to more people by extending federal tax credits, and lifting the limits on current solar tax credits. And Vote Solar wants to make sure that Congress gets it right.

You can learn all about the Vote Solar Initiative here and in this piece written by Adam Browning, cofounder and executive director of Vote Solar, for Grist.

Cross-posted from our site:

This week we talk about solar powered domestic hot water systems and the release of the third part of our interview with Dr. Kesik, a leading Canadian building science researcher. Please click below to view:

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