By Sarah Lozanova, Solar Energy Writer
Many homeowners want to install a solar electric system but don’t know if their roof gets enough sunshine. The return on investment from the solar panels and the positive environmental benefits are highly dependent on the energy production.
Here’s the essential information to determine if a house has ample solar potential.
Solar energy systems generate the most electricity when the panels are pointed south. If the orientation of the roof is slightly off from due south, it won’t have a dramatic impact on the total energy production.
If the solar panels face east, they will generate more energy in the morning. Conversely, if the panels face west, the system will have excellent afternoon production but little in the morning. It is not recommended to install panels on a north-facing roof (in the northern hemisphere).
To determine the energy loss due to orientation, go to the PVWatts website and edit the azimuth field.
Shade from Trees and Buildings
Although trees are wonderful, they can have a negative impact on solar production. Buildings and trees located east, west, and especially south can hinder electricity output. The most crucial window is the mid-day hours, between 9 am and 3 pm. Thus, obstructions on the south side of the home can have the biggest impact. If trees are an issue, trimming certain branches might be highly beneficial.
Evergreen trees can have the biggest impact on solar panels because they create shading throughout the year. Deciduous trees tend to not have leaves when the sun is lower in the sky during the cold weather months. When planting new trees, select shorter varieties or plant them on the north side of the home.
Image Credit: Sundog Solar
Do solar panels work on shaded roofs?
By Sarah Lozanova, Solar PV Writer
Residents are buying generators and battery storage systems in anticipation of outages.
Millions of California residents are bracing themselves for wildfire season’s peak. Bone-dry air and high winds are a recipe for disaster—one that brings catastrophic losses and sudden evacuations. Sadly, some of the most destructive fires in the state’s history were likely ignited by sparks from utility lines and exacerbated by heat and dryness.
Utility shut-offs to prevent wildfires affect millions
There are concerns that the state’s power grid was neither adequately designed nor maintained for this intensely dry season fueled by climate change. To help safeguard communities, utility companies have implemented massive preemptive power shut-offs when the risk of wildfires is highest. These preventive measures help avoid costly property damage and save lives. However, the power shut-offs are widely criticized because these disruptions affect the daily lives of millions. Though short outages are inconvenient, many of these pre-emptive shut-offs have lasted days—or even weeks.
Blackouts upend daily life
Lengthy power outages are severely disruptive. In many cases, residents and business owners were unaware that their power would be turned off and were left unprepared. Without electricity, many houses do not have functional telecommunications, internet, refrigeration, air conditioning, medical equipment, hot water, or cooking. Businesses were forced to shut their doors during the power outages, leaving the community without essential services.
Image Credit: James Brooks
Californians Look to Home Batteries as Backup - Solar Energy
By Sarah Lozanova, Solar PV Writer
There is now enough installed solar energy capacity in the U.S. to power 13.5 million homes, and this amount is expected to double in the next five years. The solar energy industry is part of a very dynamic market. Many factors — including government policies, fossil fuel costs, solar energy technology advances, commodity prices, and even public awareness of the climate crisis — impact solar energy deployment across the globe.
What’s in store for the year ahead? Let’s explore some trends in solar energy to better understand what is on tap for 2020.
Solar Battery Prices Are Falling
Solar energy is an intermittent energy source. This means that solar panels produce power when the sun is shining and not when it isn’t. Energy storage allows the solar system to supply power when the sun has set or in cloudy weather, expanding the capabilities of solar energy systems.
There are two main types of solar batteries: lead-acid batteries (like you have in your car) and lithium-ion batteries. The latter is far more advanced, longer-lasting, and requires less maintenance. Not surprising, lithium-ion batteries have a higher upfront cost, but the price has been decreasing significantly in recent years. The cost of lithium-ion battery storage fell 35 percent from the first half of 2018 to now (December 2019) and 76 percent since 2012. This downward price trend is good news for renewable solar energy in 2020 — and it’s likely to continue.
Natural gas plants are often used to meet peak energy loads because they can more easily be turned on and off than coal or nuclear power plants. Lower costs make it easier for intermittent renewable energy sources — such as wind and solar — to be cost-competitive with dispatchable fossil-fired power plants. Price decreases in utility-scale battery banks now make solar plus energy storage competitive in many areas on price alone. Battery banks can make it unnecessary to fire up power plants during times of peak demand, reducing fossil fuel consumption. The greater the capabilities of solar, the less attractive and financially viable these peaker power plants become.
On the residential side, more homeowners are relying on solar systems with battery storage for emergency power during grid outages than ever before. This is an especially attractive option in areas prone to extended power outages due to natural disasters or with inadequate utility infrastructure, like Puerto Rico.
Image Credit: Sundog Solar
Trends in Solar Energy - Clean Energy Writer
By Sarah Lozanova, Solar Panel Writer
The U.S. has more than 2 million solar installations. This means there are tens of millions of solar panels on roofs and racking systems. Solar energy is fantastic for reducing carbon emissions and promoting energy independence, but what happens at the end of the panel’s 30-year lifespan?
There is a looming waste management issue as solar systems age and will eventually be decommissioned. Is the U.S. prepared for large-scale solar panel recycling?
“Installations two decades ago are nearing their end of life, and that becomes a challenge for the waste industry,” says Garvin Heath, a senior scientist in the Strategic Energy Analysis Center of the National Renewable Energy Laboratory (NREL). “Because it takes a long time to develop technology and policy and solutions to dealing with end-of-life products, this is something we need to start to address today.”
According to Heath, solar panels could comprise more than 10 percent of global electronic waste by 2050.
Solar panel recycling presents an economic opportunity and can spawn new industries. A study by the International Renewable Agency (IRENA) estimates that by 2050, $15 billion could be recovered from recycling solar panels. There are also repair and reuse opportunities for solar panels that fail prematurely. These repaired solar panels are often sold at a discount, creating opportunities in new markets where affordability is an issue.
What Parts of the Solar Panel Can Be Recycled?
Glass, plastic, aluminum, and silicon comprise 99 percent of the silicon-based solar panels.
Image Credit: Nichole McClure
By Sarah Lozanova, Solar Energy Writer
This Maine family created a resilient home with a combination of solar power, battery storage, and energy efficiency.
When a windstorm last fall knocked down trees and caused 500,000 people in Maine to lose power, Eric and Alison Rector knew that their home had emergency power. Although neighboring farmhouses were without electricity for six days, the Rectors enjoyed many of their modern luxuries. Their 1,100 square foot high-performance home uses a dynamic combination of energy efficiency and solar energy with battery backup.
Maine has one of the least reliable electric grids in the U.S. Multiple day power outages are relatively common after a severe storm, and the state ranks #49 in grid reliability, according to the Department of Energy. Many rural properties with wells are also without running water during power outages because pumps needs electricity to operate. These factors helped motivate the Rectors to find solutions to make their household more resilient.
Hybrid Solar System Provides Emergency Power
The Rector’s 6-kilowatt solar PV array provided backup electricity throughout the record-breaking outage last fall. “One 48-volt battery bank gives us running hot and cold water, heat, ventilation, lights, and power for some appliances,” says Eric. “If our solar system didn’t have batteries, we would be stuck with no power during grid outages despite all our solar panels.”
The solar panel system was designed and installed by Sundog Solar and originally contained just 3-kilowatts of solar panels and the battery bank. Eric and Alison later upgraded the system and added 3 more kilowatts of generation capacity.
The Rector house was built by GOLogic to the Passive House Standard, a stringent German certification for energy efficiency, resulting in homes that use 80% less energy for heating and cooling than a code-minimum house. Because the solar was producing more electricity than they were consuming, Eric and Alison purchased a 2017 Chevy Volt to utilize the surplus. They can now drive to and from town with solar energy.
Eric has been very satisfied with the solar system’s inverter/charger because of the peace of mind that it offers. “I call the Conext XW 6048 ‘the magic box’ because it seamlessly transitions between being on grid and off grid,” says Eric. “The way Sundog Solar designed the system, the ‘magic box’ keeps the battery bank full at all times when there is grid power. During outages, there is no need to switch anything manually. All our critical systems stay powered, and the solar system charges the batteries until the grid power returns.”
By Sarah Lozanova, Freelance Solar Energy Copywriter
Last week, Elon Musk, CEO of Tesla Motors spoke before a crowd at the set of the TV show Desperate Housewives. “The interesting thing is that the houses you see around you are all solar houses,” said Musk. “Did you notice?” This news shocked the audience, as there wasn’t a solar panel in sight. Instead, the surrounding solar cells were camouflaged in glass roof tiles with styles like Tuscan and slate.
This is part of Musk’s vision to revolutionize clean energy generation. He unveiled plans by Tesla to produce solar roof tiles in a variety of colors and textures. His goal is to make solar roofs that look better than the typical roof, have an installed cost that is lower than a new roof plus the cost of electricity, last longer, and provide better insulation.
If he can pull this off, rooftops as we know them will not be the same. Could this be the leap necessary to make solar more appealing and widespread?
By Sarah Lozanova
The U.S. has enough installed solar energy capacity to power 4.6 million homes. Solar energy accounted for 32 percent of total new power generation in 2014, exceeding coal and wind energy but lagging behind natural gas. In just nine years, the installed cost of solar energy has fallen by more than 73 percent – setting up the industry for explosive growth.
TriplePundit spoke with Vikram Aggarwal, founder and CEO of EnergySage, the so-called “Expedia of solar,” about solar energy trends and what to expect for 2016 in the residential market.
1. Unprecedented boom continues
Last year, analysts predicted that solar would grow by 57.4 gigawatts in 2015. The recent five-year extension of the investment tax credit (ITC) in the U.S. for both residential and commercial installations further enhances the growth trend. Now that solar manufacturing capacity has expanded significantly, the price of solar equipment has plummeted – making solar energy cheaper than grid-supplied power in many markets.
“The residential solar market is a vibrant $7 billion industry, and on track to generate more revenue by year-end 2016 than Major League Baseball,” Aggarwal said. “The economics of solar are rapidly changing for solar shoppers, installers and financiers alike.”
Freelance clean energy writer