The Causeway Club reports fossil-fuels savings of $8,000 in the first year of solar hot water pool heating.

Against the backdrop of gorgeous Acadia National Park is the historic The Causeway Club, which since 1920 has provided a low-key way to relax and recreate. One of its most popular attractions is its saltwater pool, which originally was unheated.

The first upgrade was in 1964, when the brisk Atlantic waters were heated with LP gas, which was further improved in 2008 when ReVision Energy installed a solar hot water system.

“I doubt any of your installations have produced as great a percentage savings,” says Larry Hudgens, General Manager, who reports that in the first year of service the system saved 80% of the prior year’s propane expenditure. The estimated value of that fuel is roughly $8,000. Two years later, Larry reports that the “solar pool heating system is operating as designed with a minimum of commissioning this spring.”

Harvest the Sunshine for Your Pool

Outdoor pool heating is an excellent application for solar hot water, and one that is common in sunny climates like Florida and California. Yet, Maine has ample sunshine to harvest for a pool, extending the duration of swimming season and dramatically reducing the cost of fossil-fuel based water heaters.

Pool heating can take advantage of the very simplest type of solar hot water collector, flat plate plastic collectors made by manufacturers like Heliocol. These collectors use an existing pool pump to direct pool water through a series of valves to the solar collectors. Pool water enters the solar collectors at the bottom and rises to the top through the individual tubes of the collectors, heated by sun the entire time. This warmed water is directed back to the pool, and the cycle continues until the pool is warmed.

More advanced systems can use regular flat plate solar hot water system to provide both domestic hot water and pool heating, which is a helpful dual purpose system (though they are ineligible for federal and state rebates).

Low Profile, High Performance

In addition to being an efficient way to heat a pool, the collectors are low-profile. So much so, that Larry tells us, “It is one of the more innocuous installations I have ever seen. We have a summer full of poolside members and I bet none of them even notice the collectors.”

But they do notice the warm salt water!

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ReVision recently worked with Cumberland County to install a 10.2kw solar electric system on a 9-11 communications center.

Enphase offers robust web-based data monitoring. Features include time lapse view of system performance, historical data performance download, and carbon-offset information such as equivalent # of cars not driven based on system performance.

ReVision recently worked with Cumberland County to install a 10.2kw solar electric system on a 9-11 communications center. The photovoltaic system, paid for in large part by a state grant, will offset energy use at this mission-critical facility in Southern Maine.

While the southern exposure of the building was perfect, the site did have one challenge – two large communication poles on the south side of the roof. These poles cast a shadow that tracks across the roof at different times during the day.

This is a problem for a solar array with a typical string inverter because this small amount of shading would bring down the production of the entire array, even though just a small portion of the roof is shaded.

To overcome this challenge, ReVision used Enphase micro-inverters. Enphase is a unique product which allows each module to in a sense act as its own individual array – so that shading of one module will not bring down the performance of others.

How String Inverters Work

Usually, all of the panels on an array are linked and wired so that the direct current (DC) that is generated is delivered to a single inverter that converts the DC into usable and familiar AC power. This inverter typically lives near the building’s regular electrical panel.

In the case of Enphase, each solar module acts as its own inverter – so AC is passed downstream from the array directly to the electrical panel. And when one solar panel is shaded, rather than compromising the production of the entire array, only the production of that affected solar panel is reduced.

Enphase also includes robust data monitoring software that generates a time lapse picture of the day’s solar performance. This information will be used by Cumberland County to better understand the performance of the system and its impact on their energy usage.

The 10.2 kw array will generate an estimated 14,000kw/hr each year, enough energy to power two ordinary homes, and offsetting nearly 10,000 lbs. of C02 emissions. So far, the system has displaced enough C02 to take 90 cars off the road for a day.

This 4.3KW solar array will offset roughly 7,700 lbs. of CO2 emissions annually.

ReVision recently completed the installation of a 4.3KW solar array onto the historic Hope General Store in Hope, Maine. A nice writeup of the project was featured in the The Herald Gazette.

A few things they had to say:

Andrew Stewart, owner of the Hope General Store … said the price for the panels was so good that he couldn’t pass it up. Besides the environmental benefits, one can also receive state and federal credits for using solar power, he said.

Stewart will still rely on Central Maine Power but expects to save 20 to 30 percent on his bill. He hopes to see a payback on his solar power venture in about eight years.

Besides record low prices for solar panels, there are a number of tax and credit incentives for businesses considering solar power. There remains an uncapped 30% federal tax credit for system costs, and businesses can choose to accelerate depreciation on solar installations for further tax benefits. There is also a $2,000 State of Maine rebate for solar electricity.

All told, incentives can come close to 50% of the system cost, dramatically reducing the payback time for a system that will last 25+ years.

Meanwhile, the solar system will offset roughly 7,700 lbs. of CO2 emissions annually, or the equivalent of taking 3-4 commuter vehicles off the road!

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The Beachmere Inn’s solar electric system generates 5-8% of the Inn’s power needs, and solar hot water has reduced oil use by more than a third!

The Maine Innkeepers Association highlighted The Beachmere Inn in Ogunquit, a certified Maine Environmental Leader in Hospitality, in their most recent newsletter.

The Innkeepers Association also recognized that the inn has been independently family owned and operated for the past 72 years.

We featured The Beachmere Inn last May, when we noted how Beachmere took their green initiatives to the next level by installing 3 active solar hot water systems and a 5 kilowatt solar electric system

In the first two months of service, the solar hot water systems reduced oil consumption by 34%. Their solar hot water systems supply hot water for a 32-room main building and generate domestic hot water in employee housing buildings

The 5kW solar electric system covers 5-8% of the Inn’s total demand. According to their website, by mid 2009 more than 7,800 KW kilowatt hours of clean electricity have been produced by the solar array, eliminating 13,100 lbs of CO2.

Here’s a summary of the energy saving measures that The Beachmere Inn reports on their website:

• Solar Panels have been installed for Thermal Hot water for over 32 rooms as well as in our employee housing building.
• Solar Photovoltaic Panels have been installed for production of 5 – 8% of our energy needs.
• As of June 24, 2009 over 7,800 KW has been produced by solar power a savings of 13,100 Lbs. of Co2.
• Compact Fluorescent bulbs will be in used in all lighting
• Cold water laundry processes are being used to save electricity by eliminating the need to heat hot water for the laundry systems through Ozone technology.
• Energy star appliances are chosen first for any appliance replacement
• High efficiency heating & cooling units were installed in 2008 for Beachmere West
• Additional insulation was installed in the exterior walls and ceiling for better building envelope efficiency in Beachmere West.
• In 2007 we installed efficient, timed irrigation for the lawn and drip irrigation for our planting beds, in 2008 that effort has continued.
• High efficiency Low E Eagle windows are installed in Beachmere West (2008) and were used for all the window & door replacement at Beachmere South (2008) and in the Victorian (2000 – on going).
• Since 2000 we have been replacing old inefficient oil burners with Buderus boilers in the Victorian, South and West buildings.

In addition to their commitment to reducing energy and using energy from clean, renewable sources, The Beachmere Inn has a host of green administrative, cleaning, and building practices.

The Maine Environmental Leader in Hospitality distinction recognizes all of these efforts, and in fact, The Beachmere Inn has “one of the highest totals in certification scoring points.”

Sarah Diment, owner at The Beachmere Inn, feels, “It’s important to take steps towards environmental efficiencies as a smart business move. We know by becoming ‘greener’ we have a direct impact on bettering our environment. Our guests appreciate our efforts and implement some of what they see here in their homes.”

Visit the Maine DEP website to learn more about Maine’s Environmental Leader program, or call 1-800-789-9802.

Congratulations again, Beachmere!

The 41kw grid tied photovoltaic system on Oakhurst Dairy’s Waterville distribution center will offset over 70,000 lbs of C02 emissions annually by generating more than 45,000 kWh of clean, renewable energy.

“10% of Profit for Kids & the Environment” is written on every Oakhurst Dairy milk jug, reminding consumers that we can benefit our community by choosing local products made by responsible companies.

Investing in the communities it serves has made Oakhurst one of the most successful family-owned businesses in the region. The company is also investing in the environmental sustainability of its operations.

Oakhurst contracted ReVision Energy to design and install a 41 kilowatt grid-tied photovoltaic system to reduce energy costs and CO2 emissions at its Waterville distribution center. ReVision designed Oakhurst’s system to provide maximum performance and longevity, at the lowest installed cost.

The system was installed in August 2009 by ReVision Energy’s in-house team of certified solar technicians. With no moving parts anywhere in the system and a 25-year panel warranty, Oakhurst can look forward to decades of maintenance-free, renewable energy production.

Below are some critical stats from the system:

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Flat plate solar hot water collectors, like the eight shown here atop the Camden Riverhouse Hotel, offer superior summertime performance compared to evacuated tubes. This feature makes flat plates a better choice for seasonal businesses like hotels and restaurants.

David Dickey, owner of the Camden Riverhouse, knows a good investment when he sees one. When he saw ReVision Energy’s financial analysis and projected returns on a solar hot water system, he decided to have us design and install a system that will produce roughly 60% of the hotel’s domestic hot water.

The recently installed system takes advantage of a 30% federal tax credit, accelerated depreciation, $1,000 state rebate and low interest financing from Efficiency Maine.

The end result is a solar investment that Dickey anticipates will be cash flow positive based on annual oil savings of roughly 750 gallons. As a nice bonus, the system will also reduce the hotel’s ‘carbon footprint,’ eliminating roughly 21,000 lbs. of CO2 emissions per year.

The system consists of eight Chromagen flat plate solar hot water collectors that heat two Stiebel Eltron super-insulated solar storage tanks. The tanks have 3″ of rigid foam insulation, reducing overnight heat losses to less than .5 degree F per hour. This means that there will be plenty of piping hot water available for the tourists’ morning showers!

ReVision Energy team securing one of the 21 Chromagen solar hot water flat plate collectors

53 Danforth Street, a Maine State Housing complex recently constructed in Portland, is utilizing the sun to preheat the domestic hot water for all of its 47 units.

21 Chromagen solar hot water collectors sit on the roof and heat an 820 gallon thermal storage tank. The preheat system design moves cold water into the thermal storage tank before it enters the existing indirect hot water tanks. The system, backed by natural gas, is designed to produce over 190 million Btu’s of clean, renewable energy each year.

The building’s owner and developer is The Szanton Company of Portland. Wright-Ryan Architects were the general contractors working on the construction of the building. The mechanical contractor, who we worked for on this project, is Southern Maine Plumbing and Heating.

Maine State Housing requires all their developers to at least consider solar thermal as an option for new construction. Maine State Housing Authority has been a leader in the adoption of renewable energy; in 2006 ReVision Energy installed a 10kW grid tied solar electric system on their office building in Augusta.

Maine State Housing Authority finances the installation of solar hot water applications in multifamily housing, such as this one, and is using the anticipated revenue from the sale of carbon emission reductions to subsidize the lower interest rate of the solar loan.

Maine State Housing also offers a residential loan for energy efficient upgrades including the installation of solar hot water or solar electric systems. Their low interest loan program is called the Home Energy Loan Program, or HELP loan. View their website to learn more. www.mainehousing.org

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Kristen from the Center for Wildlife poses with non-releasable education falcon, Freyja, before the new solar hot water system at CFW’s main building.

The Center for Wildlife, a wildlife rehabilitation center based in Cape Neddick, Maine installed solar hot water collectors on their roof to supply the domestic hot water load of their main office building.

Two Chromagen flat plate solar hot water collectors are working to heat water in a 52 gallon solar storage tank. This tank acts to preheat their existing hot water tank. An electric component acts as a back up heat source for times when the solar is not able to meet the tank’s setpoint temperature. This ensures a consistent supply of hot water at the tap.

On a good sunny day, the solar system will produce a 60-80 degree temperature rise in both tanks, producing more than 14 million BTUs of clean renewable heat energy. By reducing the amount of electricity the Center will consume to heat water, over 4200 lbs of CO2 emissions will be eliminated on an annual basis.

The Center for Wildlife’s staff and volunteers provide medical care, safe sanctuary and humane treatment for sick, injured and orphaned wildlife until they can be released back into the wild. The Center has been established for 23 years and focuses on educating the general public and provides school programs to raise awareness of the many wonderful wild species that live among us.

Learn more by visiting www.yorkcenterforwildlife.org.

More Photos of the Solar Hot Water Installation: