Should you get solar now, or wait?

Here is a great review of the efficiency of solar panels in today’s market. It will probably help you if you are on the verge of deciding whether or not to install solar panels.

By George Musser

Dec 8, 2009 12:00 PM in Energy & Sustainability

“Editor’s Note: Scientific American’s George Musser will be chronicling his experiences installing solar panels in Solar at Home (formerly 60-Second Solar). Read his introduction here and see all posts here.

It’s the eternal question: Buy now or wait? Assuming you want to install solar panels on your roof, should you go for it or hold off for better technology or lower prices? I don’t have a definitive answer, but let me offer a few thoughts that might inform your decision.

Obviously, solar installers want you to jump in forthwith. Even leaving aside their self-interest, they do make some good points. There’s really no need to wait for technology to improve. In terms of how fast they become obsolete, solar arrays are more like cars than computers. Although photovoltaic cells and auxiliary equipment such as inverters are getting better, progress is slow.

For computers, technological improvements make the difference between Pong and Left 4 Dead. But as long as a solar panel produces a kilowatt of power, it doesn’t really matter how swanky it is. Arrays of the future will produce more power, but existing ones are not about to become an embarrassment. And it’s not as though technological progress will pass you by. Few arrays take up every last inch of roof space, largely because of the limitations of current inverters. You’ll be able to add more advanced panels with built-in inverters to fill in the gaps.

A more important issue is cost. Solar panels have gotten cheaper over the past couple of years, not because of technological breakthroughs but because of mundane factors such as increased manufacturing capacity in China. Installation, too, is coming down in price as contractors get the hang of it.

These trends hasten the day when solar will achieve parity with fossil fuels, but have less impact on a homeowner’s bottom line, because states are scaling back their subsidies at the same time. New Jersey, for example, is set to reduce its cash grant from $1.75 per watt to $1.55 per watt.

I think the best argument for holding off is that contractors, inspectors, and regulators are still climbing up the learning curve. Right now, you need a good deal of patience and fortitude to install solar panels. The way around this is a power-purchase agreement or leasing arrangement from a company such as SunRun or SolarCity, if they offer one if your area. In addition, large installers such as Acro Energy are working to speed up the installation process.

Another argument for delay is that conservation measures such as insulation or adjustments to your heating system might give you more buck for the buck. A fellow solar blogger, Osha Gray Davidson in Phoenix, Ariz., told me how he reached this conclusion:

We decided to take your advice and concentrate on negawatts (conservation) first. We’re getting bids to replace our aging roof with an energy-efficient one and coordinate it with installing solar panels. 1BOG just entered the Phoenix market and they’re preparing a bid for our house. We also cut back on air-conditioning this summer by installing an energy-efficient single-room ductless air conditioner by Fujitsu. Mounted on my home office wall and with the compressor outside, I keep my office comfortable and quiet during the day without cooling the entire (empty) house with central air. Our power usage was 11% less in July ’09 compared to July ’08 (July being the month with the highest power usage).

We’ve cut way back on driving as well, partly thanks to the coming of light rail to our city. We use it all the time and love it. And my wife bikes to work now that the day-time temperature has dropped below 100. We still don’t have solar panels on the roof, and I’m looking forward to that day. The larger work to reduce our carbon footprint is going well — and continues.

I highly recommend getting a home-energy audit and studying the auditor’s cost-benefit analysis of specific steps you could take. Some things that seem like good ideas, such as installing new windows, have surprisingly long payback periods, and solar panels are actually a better use of your money.

Solar panels on George’s roof, courtesy of his brother Bret Musser”

Roofing Companies: 4 Roofing Projects to Leave to the Pros

With so many building and home repair companies out there it’s hard to know who does what. Read on to find out what roofing companies do and what they can do for you.

Roofing Companies Install New Roofs

From residential roofing to commercial projects, roofing companies install new roofs. When there is new construction or a remodel, the roofing company will come in and install the entire roof. This can include everything from installing the trusses to framing the roof to laying the tar paper and installing the shingles. Though not many individuals have the need for complete roof installation, roofing companies that have the experience and knowledge to do so may be ones to look at when the time comes to research roofing companies for your own use.

Roofing Companies Repair Roofs

Roof repair is something all roofing companies do. Roof material will sometimes become worn or weathered, including warping, leaking, and missing shingles, and will require repair. Some contractors don’t like to do repairs. Many think that there is often the chance for continued decay or failure in a roof that requires repair in one place. For this reason some roofing companies may recommend replacement over repair. However, many residential roofing customers prefer repair over replacement for reasons of cost and expense. Good roofing companies can evaluate a roof to determine the damage and if repair or replacement is the best strategy.

Roofing Companies Replace Roofs

Roof replacement is the primary job of roofing companies. They spend most of their time replacing roof material on mainly residential roofing. They have many roof material options including a variety of shingles, tiles such as slate or ceramic, and even metal roofing. Because a roof is basically the umbrella that protects a home it is one of the most important parts of a house. Due to natural occurrences, such as hail, wind, and snow, and the debris that can pile up as a result of any of those, roof replacement is a common occurrence. Roofing companies also do roof replacement due to aging and wear and tear on average residential roofs. Damage from nature and age can cause leaks, and leaks can cause extensive interior damage and roof replacement is key to preventing them. Having a good and reliable roofing company evaluate your roof by doing a visual examination can help you decide if roof replacement is necessary in your situation.

Roofing Companies Can Install Solar Panels

Something relatively new to roofing companies is solar panel installation. Due to the recent concern for the environmental impact of conventional heating and energy sources, many people are turning to solar power for their homes. Roofing companies can install solar roof panels to residential roofing projects that can help generate enough energy to power an entire home. Though this type of project used to be done primarily by specialists, many roofing companies are now able to include solar panel installation into a residential roofing project plan.