Posts Tagged ‘solar panels’
By Susan Carpenter, Los Angeles TimesOctober 16, 2010
It started with gray water, then escalated to chickens, composting toilets and rain barrels. I’m talking about the two years I’ve spent transforming my humble California bungalow into a test case for sustainable living — an experience that’s cost me hundreds of hours of my time and thousands of dollars, an endeavor that has tested the limits of not only my checkbook but also my sanity — and my DIY skills.
When I launched the Realist Idealist column, the idea was to look at environmentally promising home improvement projects through the eyes of a budget-minded consumer. I had seen so much media coverage that heaped praise on newly constructed eco-manses or expensive retrofit products, but the stories didn’t answer my biggest question: For the green-minded person writing the checks, are the improvements worth the time, effort and expense?
Although everything I retrofitted seemed wise at the time I did it, hindsight tells a different story. Over time, I occasionally questioned the wisdom of some actions.
The idealist in me finds value in every improvement, but the realist can’t deny that some have been far better in terms of payback — if not financially, at least morally. The systems that easily fold in to my busy life are the ones I’ve enjoyed most.
What’s been worth the money and effort, and what hasn’t? I’ve divided the projects into two categories: “Worth It” and “Second Thoughts.”
Gray water, 1st place
Gray water is the waste generated from faucets, showers and laundry machines — water that accounts for 54.2% of all water used inside a home, according to the U.S. Environmental Protection Agency. With California deep into a drought, in August 2008 I retrofitted the plumbing on my laundry machine to send its gray water onto my landscape. Over the last two years, that simple switch has sent 9,720 gallons to passion fruit vines instead of the sewer, and it required only one change to my usual routine. I had to swap laundry detergents because my usual brand, like many, contained salt and other ingredients that kill plants.
When I first installed a gray-water system, it wasn’t legal. Making it legal would have required a permit, extensive filtering apparatus and lots of cash. But in August 2009, these laundry-to-landscape systems were legalized in California, as long as homeowners followed 12 guidelines.
I’ve been so pleased with this low-cost, high-impact system that I hired a plumber to expand it in January, tying the wastewater from my bathtub, shower and bathroom sink into the same gravity-fed plumbing line that handles my laundry water. This so-called simple system also was legalized in California in 2009. Its legal status has since been rescinded, so once again I’ve gone rogue. I estimate my additional savings to be roughly 1,120 gallons per month.
Financially, this system is paying for itself, just slowly. The Los Angeles Department of Water and Power charges me less than half a penny per gallon, so technically, gray water has saved me only $95 in water costs so far. But it’s also reduced my sewer charge by about one-third, saving me an extra $3.30 per month. In drought-prone Southern California, gray water feels like the right thing to do. It’s been the easiest, most sensible, hassle-free, sustainable system I’ve put in place at my house.
Cost: $1,988 ($312 for the laundry-to-landscape plumbing, $1,676 for bathtub and bathroom sink tie-in)
Resources: Greywater Action, http://www.greywateraction.org; Oasis Design, oasisdesign.net
Solar power, 2nd place
Photovoltaic systems pay off most quickly for consumers who use a lot of energy because tiered rates impose a penalty for heavy use, but solar electric still makes sense for low-energy users such as myself.
So much of Americans’ carbon footprint results from buildings — about 43%, according to the U.S. Department of Energy. I’m a household of 1.5 (mom and 7-year-old), and we use only about 4 kilowatt hours of electricity per day, something we’ve managed through behavioral changes, such as turning off the lights in rooms after we’ve exited, and through in-home efficiencies, such as swapping out incandescent light bulbs for compact fluorescents and using power strips that can turn off DVD players, coffee makers and other energy vampires.
Using less electricity means I can get by with a smaller, less expensive photovoltaic system that not only covers my use but also produces a credit on my power bill. Going solar also meant my house was upgraded with a time-of-use meter. This type of meter allows me to receive credit for the electricity I generate during peak hours when electricity costs the most, but pay the least for the electricity during off-peak hours, when I recharge my cellphone and laptop and perform other tasks requiring power.
The downsides are that I am tied in to the grid and still susceptible to power outages, and I now have panels that need to be cleaned. It’s a subject of debate, but my installer, REC Solar, said dirty panels decrease energy production by 6% to 8%. Many panel manufacturers recommend cleaning panels at least once during the summer. I wash mine whenever they look dirty or dotted with bird droppings, which is about every other week.
I think $6,000 is a small price to pay, not only for panels that should generate my next 20 years of electricity, but also for the greenhouse-gases I’m not creating.
Cost: $5,939 ($11,564, minus a $3,898 DWP rebate and a $1,727 federal tax credit)
Rain barrels, 3rd place
I was a rain barrel skeptic before I joined L.A.’s rainwater harvesting pilot program last fall and received a 55-gallon pickle barrel. Though rainwater holds such enormous potential for supplementing Southern California’s dwindling reserves of imported water, rain barrels seem like such thimbles. During a normal L.A. winter, my 1,500-square-foot roof generates 13,500 gallons of water — a tidal wave compared to what a little barrel can handle.
Having lived with rain barrels for a year, I’ve learned that their small size makes them manageable and affordable. The water they catch isn’t stored only for summer use. It can be drained in between rains to water nearby plants. An added perk: reducing storm-water runoff to the ocean.
I have three rain barrels — one from the city and two that I purchased separately. They’re along the edge of my house, at the halfway point in a row of kiwi vines and berries. The 175 gallons they hold were a lot more useful than I’d expected for feeding my exceptionally thirsty fruit plants. The water they held lasted about a month into the summer.
I never had mosquitoes. I did, however, have some algae growing in the plastic tubes connecting my rain barrels, but it wasn’t significant enough to reduce flow. Water pressure was problematic only for the last few gallons of each barrel.
I still think larger rain catchment systems are preferable. Alas, larger systems frequently need electric pumps and are far more expensive. In this economy, affordability rules. And it’s affordability that could lead to mainstream adoption and significant water savings for our parched city.
Cost: $500 ($300 for rain barrels, $200 for installation and parts)
Resources: L.A. Rainwater Harvesting, http://www.larainwaterharvesting.org; Rain Bud, http://www.rainbud.com
Earth works, 4th place
Rainwater isn’t only a resource. It’s also a potential pollutant if it runs off property onto pavement, picking up fertilizers and automotive fluids that are washed, unfiltered, into the ocean.
To prevent my home’s contributions to runoff, which could be as much as 10,000 gallons per year, according to L.A.’s Bureau of Sanitation, I’ve sculpted my landscape to retain as much rainwater as possible.
The parkway between the sidewalk and the curb is concave and mulched. My backyard is home to a 15-foot-wide hole in the ground that is fed with gutters from my roof. During the rainy season, this infiltration pit can hold as many as 500 gallons at a time, allowing it to gradually replenish groundwater. During the dry season, it’s been doing double duty as a skateboard pit.
Cost: Not easy to determine because it was part of a larger landscape project, but for DIYers, potentially free
Resources: Rainwater harvesting books by Brad Lancaster, http://www.harvestingrainwater.com
The Waterwall is an Australian product that is exactly what its name implies: It’s a wall that catches and stores water. Water channeled from the roof and gutter drains into a tank shaped like a thick concrete-block wall. It operates similarly to a rain barrel but holds six times as much water and is better looking. It’s also modular, allowing water to flow freely from one wall into another in series.
The Waterwall was expensive, and installation was a nightmare. It’s an excellent idea that simply wasn’t worth the money for a person of my means. If California’s drought persists and water prices start going through the roof, I’m likely to change my attitude. But so far, the $4,078 I’ve spent to store 634 gallons of water I could have bought from the city for about $3 is an embarrassment, particularly with so many ways to conserve.
Even worse, it’s been annoying to use. I put my Waterwall near a trio of stone-fruit trees that would happily drink in the water. Unfortunately, the water pressure drops along with the level of water in the wall, and running the water through a relatively short, 15-foot length of hose or even lifting the hose above the spigot decreases its flow rate.
I love the Waterwall in theory, and I still think I would’ve ringed my backyard with Waterwalls if I’d known about them 10 years ago, when I installed an appallingly expensive redwood fence.
Cost: $4,078 ($2,300 for two walls, plus $944 for shipping and taxes, plus $834 for installation)
If I had to do it over again: I’d go with a cistern or a large, agricultural above-ground tank.
When the economy was freefalling two years ago, I couldn’t shake the fear that the American infrastructure was about to crumble and that I should start growing my own food. Thus began an incredibly long, expensive and back-breaking journey. Not only did I have soil that was high in lead, but I also had critters that liked to dig and destroy. Then there’s the water issue. It takes a lot of the wet stuff to grow most fruit and vegetables.
Having transitioned my low-water ornamental landscape to edibles, I’d say this is a project for people with time, money and a love of gardening and cooking. It isn’t a job for single mothers with high-stress jobs who’d rather not spend their precious down time watering, pulling weeds and bringing in their harvest.
I’ve resigned myself to the fact that I won’t likely learn as much as I should to maximize my yields. At this point, I’m just hoping this whole project won’t end up being a high-cost intellectual exercise that bears little fruit. Passion fruit and tomatoes have had the biggest payoff so far. Beans, corn and kale? Not so much. It’s so easy to get high-quality produce from a CSA, or community supported agriculture group, which is what I’ve been doing for the last year: spending $18 a week for organic, locally grown produce conveniently delivered to my son’s school.
If I had to do it over again: I would install one or two planter boxes. I’d buy the rest of my produce from a community-supported agriculture group such as Equitable Roots.
Water is a precious resource, and we flush an awful lot if it away. At my house, my low-flow toilet uses 1.6 gallons per flush. If it’s flushed 10 times a day, that’s 16 gallons of imported drinking water that’s pooh-poohed and sent 23 miles to a wastewater treatment plant that uses precious electricity to process it, then has to dispose of leftovers.
The final frontier of green living, the composting toilet is a low-tech option. There are a surprising number of commercial composting toilets on the market that look nice, cost a fortune and can’t handle heavy use, which is why I went with something called a Separett. Developed in Sweden, it’s a piece of plastic foam that looks like a toilet seat except it’s outfitted with two holes — yes, No. 1 and No. 2. Each empties into its own 5-gallon bucket I access through a trap door on the side of my house.
I’ll admit, as committed as I am to living green, this is not a system I use all the time. In fact, I use it rarely, and only for No. 1
As much as I support the premise of a composting toilet, I’m more devoted to the traditional porcelain god. I just try to flush less.
Cost: $627 ($127 for Separett, $500 for construction labor and materials to convert built-in cabinet to toilet)
If I had to do it over again: I might need more clearance under my house, but I’d go with a commercial composting toilet from Clivus Multrum.
This is one of the projects I was most excited about and one that’s turned out to be among my biggest failures. After buying a chicken coop, feed and hens procured through L.A. Animal Services, I got only four eggs.
L.A. may be a sprawling metropolis, but it isn’t devoid of wild animals. Some people have coyotes. I’ve got possums and raccoons, which breached my coop and gobbled down my ladies.
A forensic investigation revealed the intruder had dug under its edges, so I fixed the problem by driving stakes deep into the ground and nailing pieces of wood to other possible areas of entry. Although I wasn’t 100% confident that these beady-eyed villains wouldn’t return to the scene of the crime, I nevertheless journeyed back to the animal shelter to purchase two more chicks, only to be woken up at 1 in the morning to the sound of distress. Running outside, I found a lady bird dangling from the mouth of a shiny-eyed raccoon. The other chicken was missing.
I’ve been buying eggs at the store ever since, but I was hipped to my local egg underground. Last week, I got my first dozen eggs from a neighbor who’s more game than I for the challenge of raising chickens.
Cost: $530 for coop, feed and chickens
If I had to do it over again: I would skip the coop and find a local alternative.
SIDEBAR: EASIER FIXES
Green home improvement doesn’t have to mean elaborate new systems or expensive construction projects. Some small steps for a greener life:
Laundry line: Clothes dryers account for 5% to 10% of a home’s energy use. I have one, but I use it only if I’m desperate. My laundry line is strung unobtrusively across my backyard deck, and the sun dries clothes in mere hours. For me, the low-tech laundry line is about the easiest and simplest thing I can do to reduce energy use and greenhouse gas emissions. Cost: about $50 for equipment.
Diet: My home improvement retrofits have convinced me that more environmental savings could be obtained by eating less meat and dairy. The cattle business creates more greenhouse gases than the transportation industry, according to a 2006 United Nations report. So, although I love burgers and can’t give them up entirely, I eat fewer, and I’m mostly substituting almond and soy milk for dairy.
Composting: About 26% of the U.S. municipal solid waste stream is yard and food waste, according to the Environmental Protection Agency. Composting that waste is how I produce only a small grocery bag’s worth of trash every other week. It’s one of my greatest achievements. About a quarter of my trash savings comes from composting food scraps. Cost: $20 for a bin through a city of Los Angeles composting workshop.
Recycling: The other three-quarters of my trash savings comes from recycling, for which I have an almost-religious fervor. About 80% of what Americans throw away is recyclable, yet only 28% actually is recycled. Cost: nothing but the time it takes to throw something in the blue bin.
Researchers have developed technology for large-scale solar power installations to self-clean.
BOSTON, Aug. 22, 2010 — Find dusting those tables and dressers a chore or a bore? Dread washing the windows? Imagine keeping dust and grime off objects spread out over an area of 25 to 50 football fields. That’s the problem facing companies that deploy large-scale solar power installations, and scientists today presented the development of one solution — self-dusting solar panels ― based on technology developed for space missions to Mars.
In a report at the 240th National Meeting of the American Chemical Society (ACS), they described how a self-cleaning coating on the surface of solar cells could increase the efficiency of producing electricity from sunlight and reduce maintenance costs for large-scale solar installations.
“We think our self-cleaning panels used in areas of high dust and particulate pollutant concentrations will highly benefit the systems’ solar energy output,” study leader Malay K. Mazumder, Ph.D. said. “Our technology can be used in both small- and large-scale photovoltaic systems. To our knowledge, this is the only technology for automatic dust cleaning that doesn’t require water or mechanical movement.”
Mazumder, who is with Boston University, said the need for that technology is growing with the popularity of solar energy. Use of solar, or photovoltaic, panels increased by 50 percent from 2003 to 2008, and forecasts suggest a growth rate of at least 25 percent annually into the future. Fostering the growth, he said, is emphasis on alternative energy sources and society-wide concerns about sustainability (using resources today in ways that do not jeopardize the ability of future generations to meet their needs).
Large-scale solar installations already exist in the United States, Spain, Germany, the Middle East, Australia, and India. These installations usually are located in sun-drenched desert areas where dry weather and winds sweep dust into the air and deposit it onto the surface of solar panel. Just like grime on a household window, that dust reduces the amount of light that can enter the business part of the solar panel, decreasing the amount of electricity produced. Clean water tends to be scarce in these areas, making it expensive to clean the solar panels.
“A dust layer of one-seventh of an ounce per square yard decreases solar power conversion by 40 percent,” Mazumder explains. “In Arizona, dust is deposited each month at about 4 times that amount. Deposition rates are even higher in the Middle East, Australia, and India.”
Working with NASA, Mazumder and colleagues initially developed the self-cleaning solar panel technology for use in lunar and Mars missions. “Mars of course is a dusty and dry environment,” Mazumder said, “and solar panels powering rovers and future manned and robotic missions must not succumb to dust deposition. But neither should the solar panels here on Earth.”
The self-cleaning technology involves deposition of a transparent, electrically sensitive material deposited on glass or a transparent plastic sheet covering the panels. Sensors monitor dust levels on the surface of the panel and energize the material when dust concentration reaches a critical level. The electric charge sends a dust-repelling wave cascading over the surface of the material, lifting away the dust and transporting it off of the screen’s edges.
Mazumder said that within two minutes, the process removes about 90 percent of the dust deposited on a solar panel and requires only a small amount of the electricity generated by the panel for cleaning operations.
The current market size for solar panels is about $24 billion, Mazumder said. “Less than 0.04 percent of global energy production is derived from solar panels, but if only four percent of the world’s deserts were dedicated to solar power harvesting, our energy needs could be completely met worldwide. This self-cleaning technology can play an important role.”
» posted on Tuesday, June 15th, 2010 at 2:37 pm by Woody Wilson viewed 748 times
If you appreciate the occasional DIY project, then this one is perfect for you. With a proper set of tools and the right materials like plywood, glass sheets, and photovoltaic cells, you will be able to start building your own solar energy panels. You probably already have most of the necessary tools at home, and the other materials are easily available in stores or on the Internet.
Where to Install your Homemade Solar Panels
The rooftop is generally the best place to install solar energy panels, as this is the area that usually receives the most direct sunlight. If this is not the case, the panels can also be placed in the backyard, in a spot where the sunlight is not obstructed.
Homemade solar panels are easy to install as long as you have an instructional guide handy. You will find a number of affordable resources available on the Internet that you can use.
Taking it One Step at a Time
The best way to start your project would be to first build a small solar panel. This way, you can familiarize yourself with the process of building the panels more easily. Once you have completed the first panel, you can then start building more until you reach the number required for your home. If you wish, you can even build enough solar panels to provide for all of your home energy needs, making your home completely independent of the regular power grid!
Solar energy panels also require very little effort to maintain, making this a favorable DIY project for many homeowners. If you are willing to put in the effort to make this DIY project work, you will find that building homemade solar panels will save you large amounts of money on your electricity bills.
By: George Moss
About the Author:
TVA looks at how to cut power needs
By Anne Paine • THE TENNESSEAN • May 3, 2010
Refrigerator doors open and close. Dishwashers and showers run from time to time. Lights click off and on.
It’s a bit ghostly because no one’s home in the three almost identical houses in the Campbell Creek subdivision of Knoxville.
But the robotics-driven houses have wildly varying electric bills, from close to $7 a day down to $1. That’s because of how they were built.
The activities inside the houses are part of a research project by the Tennessee Valley Authority and others to develop the most cost-effective and easy-to-use home energy efficiency technologies for consumers and builders.
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“You buy a house, it’s got hardwood floors and granite countertops so it must be a good house, you think,” said David Dinse, project manager for TVA.
“These three houses don’t look any different from each other, but one uses less than a third of the energy.”
The public power producer is trying to figure out the best ways to cut electricity demand. That lessens the need for costly new power plants that rack up debt for ratepayers.
The work fits in, too, with a nationwide interest in increasing energy independence and reducing pollution.
Buildings are one of the country’s greatest energy wasters, and federal data shows Tennesseans in a recent year used more residential electricity per person than any other state except Alabama.
What amounts to a TVA science experiment involved building three 2,400-square-foot, look-alike houses — each with a different level of energy efficiency.
A company constructed the base home for $244,800 with standard techniques. The second house was built the same, but afterward workers retrofitted it with energy efficiency features that resulted in about a
40 percent drop in electricity use.
The standard house costs almost $7 a day in electric utilities, while the bill for the retrofit house runs around $4 a day.
The third house — built with cutting-edge features and solar panels — is a near zero energy house, with an electric utility bill of about $1 a day.
The largest savings of the retrofit house over the first came from having the heating and air conditioning ducts and system inside the house. Otherwise, the system spends electricity fighting the extremes of cold and heat.
“We should just make it illegal in new homes to put heating and cooling systems anywhere outside the envelope,” said John Christian, building researcher with Oak Ridge National Laboratory, a partner in the project along with the U.S. Department of Energy.
“Why would we waste 35-45 percent of the energy?”
Putting in fluorescent bulbs brought a 21 percent savings over the base home.
The homeowner would actually save money — $35 a year — from the beginning if the retrofit project money were borrowed at 6 percent interest over 10 years and TVA incentives were used. The amount saved jumps to $1,000 a year after that.
Readings on energy use are taken automatically every 15 minutes in the two-story houses where simulations of family life take place, right down to running the washers and dryers.
Hundreds of monitors collect data on energy performance, as well as on temperature and humidity to gauge comfort.
The stainless steel refrigerators have a sign that warns “Caution: Refrigerator doors open automatically.”
Yellow-coated posts like giant arms hold the doors, ready to swing them open at those times when a member of a family of three might do so.
John Kerr, who built the three traditional-style, all-electric houses, called the project and its results “eye-opening.”
“Every house built today has insulation installed, but it only takes a little gap in the insulation and it’s like a window’s open all the time,” said Kerr with Michael Rhodes Construction.
Christian, the scientist who selected the technologies and oversaw their installation on the second two buildings, made the sites almost like a classroom.
“I had a pretty good knowledge of building homes inside and out,” said Kerr, a builder for 30 years. “After working with Jeff, I found out there are things constantly evolving in the energy field.”
Rather than having regular clashes with a “laboratory geek,” Kerr discovered he and his crews enjoyed learning new ways to build that don’t necessarily add costs, but increase energy efficiency.
While the retrofit home received about $9,000 in changes, $6,000 was for attic work that included insulating the top and sides of that area where the heating and air conditioning system is located. Putting the system inside the house’s heating and cooling envelope was a built-in feature with the third home.
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“Even if you build in a conventional method without trying to add these energy efficiency features, the most important thing about building today is caulking and installing your insulation properly and making sure you control air infiltration,” Kerr said.
Kerr framed the third house differently from the first two, and the added features — including about $13,000 in solar panels — contributed a total of about $30,000 to the cost. The extra cost, if paid for with a 30-year loan at 7 percent interest, would be about $35 a month for those years.
One would have a more comfortable house climate-wise and something of an energy insurance policy, Christian said. It’s likely that electric prices will rise in the future, bringing that extra $35 a month down.
Project to last until 2012
Different techniques will be tried in the houses TVA is leasing through at least 2012.
“We’re learning as we go with what we’ve installed and using that learning to guide further retrofits,” Christian said.
The houses will be sold when the project is over.
In the meantime, what’s it like to have houses with phantom activity nearby?
“They’re no bother,” said Bruce Loftis, who invited Christian to the July 4 neighborhood block party like he was one of them.
“The lawns get mowed,” he added.
Contact Anne Paine at 615-259-8071 or firstname.lastname@example.org.