5 Partially Solar-Powered Cars You Can Buy

                        Video Credit: DPC cars & Youtube.com

The creation of a solar-powered car is an ambitious project that many enthusiasts were trying to bring to reality. Unfortunately, so far are created only partially solar-powered cars, and in this post, I’m going to describe 5 of them you can buy.

1. Lightyear One is a long-rage, solar-powered electric car that has five square meters of small solar tiles, which cover the whole futuristic vehicle, from front to back, across a curved roof. The solar car has a 60kWh battery and charges at a rate of 12 km (7.5 miles) per hour while driving. It can also use electric vehicle charging stations, which provide up to 725 km (450 miles) of range on a single charge. The solar cells are 20 percent more efficient than traditional models and can add 50 - 65 km (30 - 40 miles) of range per day. The solar cells are encased in safety glass to protect them from damage. The company says that the Lightyear One is the most aerodynamic car in the world, with a drag coefficient below 0.20, although it is still in the prototype stage. 

Lightyear is the Dutch car company founded in 2016 by ex-members of Solar Team Eindhoven (STE), a team of engineering students who won the solar-powered World Solar Challenge race in 2013, 2015, and 2017. The Lightyear One car is expected to cost about €150,000 when it goes on sale in 2021.

2. A German full electric car Sono Sion developed by Sono Motors is another example of a partially solar-powered car. Thanks to its battery charge it can run 155 miles (250km). The car also has 248 solar cells spread across its body, which provide it an additional 21 miles (34km) of solar range. With a completely new manufacturing process, the solar modules are perfectly adapted to the shape of the vehicle. You can find it on the market at 25,500 EUR. The Sono Sion uses a bidirectional onboard-charger to share its power to recharge other electric vehicles.

3. The Korean car manufacture Hyundai also created a partially solar-powered car. A new version of its hybrid car Sonata (gas-electric sedan) offers built-in solar panels on its roof. The solar roof gives the car an extra 2 miles (about 3.5 km) of driving range per day, charging a car’s battery for 6 hours - both while driving and when parked in the sun. They say that between 30 and 60 percent of the car’s battery can be recharged by its solar panels. Hyundai underlines that its solar roof has a “supporting role" to its hybrid engine but for a year, it can add up to around 700 miles (1,300 km) of driving range from solar power.

The 2020 Hyundai Sonata Hybrid Limited is the first of its kind available in the United States. The Toyota Prius Prime has a solar roof available in some overseas markets, but not in the U.S. The as-tested price of the Hyundai Sonata Hybrid Limited comes to $36,430, which includes Hyundai’s 10-year warranty.

4. Toyota was the first major car manufacturer to offer the option with a solar roof incorporated in its Prius hybrid plug-in model in 2010. It generates about 50 watts of power, which is enough to provide energy to a fan which cools the cabin of the Prius when the engine is off. Later, in 2017 Panasonic has developed a solar photovoltaic car roof for the Prius PHEV, upping the wattage from 50 W to 180 W. 

Now Toyota developed their latest model Prius with solar panels, in cooperation with Sharp and NEDO (New Energy and Industrial Technology Development Organization of Japan). It uses such technology that lets the car’s battery charged while in the motion, not just when it is parked in a sunny place. The companies are working on attaching to the car's surface 0.03 mm thick solar cells. They can be attached to curved areas on cars like the roof, the hood, or the hatchback. 

The new model is still in the testing period, but it promises 860W at 34 percent efficiency, 44.5km on a full charge, and 56.3km if it's recharging while driving. The companies are hoping that by using the best solar panels and the most efficient batteries available on the market, besides experience with car-manufacturing, they can create a vehicle that might run forever. "The solar car's advantage is that, while it can't drive for a long-range, it's independent of charging facilities," said project manager at Toyota, Koji Makino.

5. California’s company Aptera Motors developed the first solar-powered electric (3-wheel, 2-passenger) vehicle that will never require charging. Besides, the car has an option to drive autonomous. The solar panels integrated into the car’s body harness the sun’s rays and provide owners with a substantial amount of free solar power. You can drive 43 miles of range per day of free solar power with a total 700W: 3 square meter/180 solar cell array. This is in addition to a 1,000-mile range battery pack, which you can charge at any time. And if there is excess power you can run electrical appliances in your home. Another option that Aptera includes is to upgrade and replace the existing solar panels on the vehicle.

The Aptera solar-powered car will cost roughly between $34,000-$59,000. The Aptera is still in the prototype stage but the company claims 10,000 vehicles will be made by 2022, and they will soon be open to taking pre-orders.

Finally, out of the list, because it is not for sale, I’m going to present an impressive model of a partially solar-powered car - Stella Era.

The Stella Era is a solar-powered, autonomous 5-person family car, developed by the Solar Team Eindhoven (STE), a multidisciplinary group of students from the Technical University Eindhoven in the Netherlands. The Stella Era has a range of 1200 km (including 300 km solar) and the ability to autonomously drive to a sunny parking spot when it is parked in the parking lot. The team also says that the Stella Era isn't just a solar-powered car, it is "a charging station on wheels”. Thankfully the innovations in charging (specifically bidirectional charging), the car can store energy and transfer it to other cars, to the grid, and into battery packs in self-sustainable homes.

So, although there is no entirely solar-powered car yet, the partially solar-powered, eco-friendly models above show that the key steps have been made and the sunny futuristic future is already here :)

Sources: cnn.com, sonomotors.com, losaltosonline.com, 

whatsorb.com (Toyota), whatsorb.com (Aptera)

Read also an old post: Solar-Powered Electric BlueCar soon in Europe | Solar Energy - Green Lifestyle for You

Solar Morrocan Village - the First Village Powered by the Sun in Africa

Image credit: Cluster Solaire

Thirty-two solar photovoltaic panels were installed to harness the sunlight and power the small village of Id Mjahdi, in Morocco. The village is situated on the sunny Atlantic coast, near the coastal city of Essaouira (around 190km to the west of Marrakesh), and it became the first entirely solar-powered village in Africa.

This news was reported by CNN in December last year but I found this inspiring and decided to write a post about it now. I think that solar energy can help millions of people in Africa to get access to cheap and reliable electricity and to improve their lives in all aspects.

According to the International Energy Agency, solar power may become one of Africa's top energy sources. Of all solar power that is used globally, less than 1% currently comes from the continent Africa. Morocco already has 35 percent of its electricity needs from renewable energy sources (solar, wind, and hydroelectric power), and its goal is to increase the use of renewable energy to 52 percent by 2030, according to the International Renewable Energy Agency (IRENA). "Morocco is unquestionably a leader in sustainable energy," says Francesco La Camera, director-general of IRENA.

Marocco already has the world's largest solar concentrated farm, the Noor-Ouarzazate complex. The solar farm is built on an area of more than 3,000 hectares. The size of the farm corresponds to 3,500 football fields and produces enough electricity to power a city such as Prague, or twice the size of Marrakesh.

And now, Id Mjahdi was chosen for this pilot solar project to demonstrate how remote villages, which are expensive to connect to the power grid of the National Office for Electricity, could be powered with solar energy. The author of this project is Moroccan solar power company Cleanergy. Their idea was to electrify remote communities, and Id Mjahdi was chosen because they needed everything, according to the company's founder, Mohamed Lasry.

The people in Id Mjahdi relied on candles for light, and they usually used them only around an hour for working or studying in the evenings. They used tree bark for heating and cooking, and Id Mjahdi did not even have a nearby source of water. The girls often missed school days to walk several miles to a well. It’s hard to believe that in the 21st century still have such places.

The first step of the project was to build a water tower for the community. The next step was to install 32 solar photovoltaic panels, which generate 8.32 kilowatts of electricity for distribution via a mini-grid. Around 20 homes in the village are connected to the solar mini-grid, serving more than 50 people. Each family was given a water heater, fridge, television, and oven. Each house was provided with an outlet to charge electric appliances. The solar network has also a battery, to store electricity for later use at night. The street lights in the village are also solar. 

The solar project was supported financially by the Moroccan ministry of energy, Moroccan Agency for Sustainable Energy (MASEN), Essaouira’s local authorities, Moroccan non-profit group Cluster Solaire, the French supermarket chain Intermarché, and the soaps company Le Petit Olivier. The cost of the entire project was $188,000.

In October 2019, Cleanergy opened several solar-powered buildings - a hammam (public baths), a workshop providing jobs for women to produce argan oil, and an educational center for children between the ages of three to six, which gives the opportunity their mothers to work. The chance to have a job is another major benefit for the community. 

The educational center comprises two classrooms, a sports field, and a playground. For adults are offered also, basic literacy classes. 

At the village was created an association like a cooperative, and it owns the whole production. The association takes a small fee from the argan oil sales to maintain the solar network. Cleanergy trained the men and women in the village how to manage it.

Now Cluster Solaire is seeking funding to build more solar villages. There are 800 villages without electricity in Morocco alone, and the World Bank estimates that 840 million people lack access to electricity worldwide. 

Id Mjahdi could be a model for other remote community which still lack access to electricity. Around 650 million people will lack access to electricity in 2030, according to the World Bank. It says that mini-grids could be the most cost-effective solution for remote areas, and have the potential to provide electricity to as many as 500 million people by 2030. With about $220 billion of investment, it is possible to build around 210,000 mini-grids. And they also help to save our planet: 210,000 solar mini-grids would help avoid 1.5 billion tons of CO2 emissions globally.

Sources: CNN.com & Internet

Foldable Solar Roof For Parking Lots

A foldable solar roof for parking lots is something new in solar technologies.

Today, solar energy is used all over the world. There are many improvements in already existing solar technologies. Entirely new technologies and innovative solar devices are emerging. More and more people have solar-powered homes. Back in 1956, the cost of solar used to cost around $300 per watt. Now, in the US, you can get rooftop solar for $1.49/watt from Tesla and a similar price from others.

According to the latest news, a company in Switzerland and its partner, Kronberg and St. Gallish-Appenzellische Kraftwerke (SAK), have created something unique in the field of the solar technologies - a foldable solar roof, that comes out only when the sun is shining. It is not a typical roof designed for residential use. This solar roof is meant for parking lots and generates power for on-site consumption, including for electric vehicles charging (there are two charging stations). It also provides shadow to keep vehicles cooled when the weather is hot.
         

                            Image credit: cleantechnica.com

The companies started this project back in the spring of 2020 when they built the foldable photovoltaic system on the Kronbergbahn’s parking lot. When the sun rises, the solar roof unfolds and soaks up the rays to generate solar power, then when it’s cloudy, raining, or during night time, it folds up. The foldable photovoltaic roof is named Horizon, its size is 43,056 ft2 (4,000 square meters), has a 420 kW generation capacity, and it covers the parking lot for 152 cars. The cost of the entire project is about 1.5 million Swiss francs.   

The foldable solar roof  was manufactured at DHP Technology headquarters in Zizers. It uses mono and polycrystalline solar cells and glass-free laminate tech. “The folding sunroof is lightweight because we use glass-free solar module technology,” said the DHP representative. “The installation is simple and is based on the plug-and-play approach.”

The parking lot has 1,320 solar panels and produces 350,000 kWh per year. Right now, the companies are looking for investors who are interested in sponsoring a system. There are 660 panels available and expected to be licensed soon to interested clients. The license agreement is for 15 years. 330 panels are already used by SAK and Kronbergbahn AG.

Investors will receive five different experience vouchers during their 15-year right of use - the vouchers vary depending on the investment. If you are interested in investing in a panel, you have two options. You can invest in a whole panel or by the quarter:

1. Entire Panel CHF 800 ($852)
2. Quarter Panel CHF 200 ($213)

The sources of this news are cleantechnica.com (you can see a video on their website), pv-magazine.com, and interestingengineering.com. 

Topher White Saves Rainforests with Solar-Powered Used Smartphones

Image credit : The New York Times

As we all know the forests (including rainforests) are essential for our planet. Millions of people depend on them for their livelihoods and they can help combat climate change by absorbing carbon dioxide. Unfortunately, poachers and illegal loggers do not interested in it. So, how to save them? Topher White, a physicist, and engineer have a brilliant idea of how to save the rainforests with the help of solar-powered used smartphones and advanced AI training platform (Google technology called TensorFlow).

The idea came to him in 2011 during a trip to Borneo, Indonesia. He was visiting a gibbon reserve in the heart of the rainforest when he stumbled upon logger illegally cutting a tree. Most surprising for him was that the man was working only a few hundred meters from the rangers' cabin. Covered by the usual noises in the forest as the chirps of birds, the buzz of cicadas, the banter of gibbons, the sound of chainsaws went unnoticed.

After returning to the United States, Topher White developed a solar-powered device and later founded San Francisco-based non-profit Rainforest Connection. The device consists of an old Android smartphone equipped with highly sensitive microphones that record the sounds up to three square kilometers around. When the sound of a chainsaw is detected, the phone sends a real-time alert to the cloud server that sends a notification to the rangers, who can then get the logging stopped. Detecting the sounds is possible thanks to the AI system that can be trained to identify all kinds of sounds, from mechanical sounds like chainsaws to the sounds of specific animal species.

A homemade solar panel system, also made from recycled materials, power the listening device despite the shades in the rainforest. And surprisingly, even in remote forests, you can often get decent cell reception that makes sending the alert possible.

At first, White had an intention to use commercial solar panels, but he hadn’t considered that the diminished sunlight under a canopy of trees could be a problem. Doing research, he found some papers from the 1950s and 1960s that mentioned sunflecks - transient spots of direct sunlight. “It turns out that 80 or 90 percent of the solar radiation that makes it through the canopy comes in the form of sunflecks,” White says.

D2solar, a solar-module prototyping firm in San Jose, Calif., helped White to design special flower-like structure, with the phone in the middle, and small solar panels sprouting as petals. These solar panels generate enough power for the phones, even under the forest canopy. They use discarded strips of monocrystalline panels and cut them into petal-shaped patterns. Each petal consists of three 0.5-volt cells, wired in series, and seven petals are then wired to each device in parallel.

“The idea was to space the petals based on the average diameter of the sunfleck and to distribute them as widely as possible around the device so that at any given time there was a high probability that the sun would be striking all the cells on a petal,” White explains.

“I was surprised that it worked,” says Michael Rowell, who was working at D2solar as an R&D engineer at the time. “If you stick a normal solar panel in the jungle, it won’t work no matter how big it is.” White’s solar flowers generate 1.5 V, which he boosts to 5 V using a simple circuit. And finally, his rainforest protective solar-powered devices were ready to be placed high up in the tree where they will be invisible.

Between 15 and 30 percent of wood traded on the global market is harvested illegally, according to the United Nations Environmental Programme and Interpol. In key tropical countries, illegal logging accounts for 50 to 90 percent of all forestry products on the market. White says that deforestation is a bigger contributor to the greenhouse gas emissions than all the world’s vehicles combined - cars, trucks, trains, ships, and planes.

White overcame many obstacles and complications to bring to the reality his simple solution. He now spends nine months out of the year installing and troubleshooting the “forest guardians”. Today, listening solar-powered devices are saving trees in Indonesia, Brazil, Cameroon, Ecuador, Peru, Bolivia, and Nicaragua. White won the support of the non-profit organizations, tribes, and local communities. And something very important, he’s won the support of environmentalists and forest law-enforcement groups. Randy Hayes, the founder of the Rainforest Action Network, calls White’s system “a powerful tool that could do a lot of good on the planet.”

Sources: spectrum.ieee.org & thejakartapost.com

Gel Makes Solar Panels “Sweat” to Cool Themselves

Image credit: pixabay.com

Last month I read something interesting in the news concerning solar panels and I decided to write a post about it in my blog. It is something new in solar power technology - gel-like material makes standard solar panels “sweet” to cool themselves. Liangbing Hu, a materials scientist at the University of Maryland, College Park says: “it’s a simple, elegant, and effective way to retrofit existing solar cell panels for an instant efficiency boost.”

Typical silicon solar panels convert approximately 20% of the sun’s light into electricity. Much of the rest turns into heat, which can warm the solar panels by as much as 40°C/104°F. As we know, the heating of the panels is one of the most serious problems - solar panels are much less efficient when overheated. In fact, with every degree of temperature above 25°C/77°F, the efficiency of the solar panel drops. 

In recent years, researchers have devised materials that can suck water vapor from the air and condense it into liquid water for drinking. Among them are researchers at the University of Texas who have created a new gel-like material. Initially, the gel was created to produce clean drinking water. It proves its effectiveness and has the potential to provide a clean, sustainable water source for millions.

The gel-like material is a mix of carbon nanotubes in polymers with a water-attracting calcium chloride salt. This substance absorbs water vapor at night when the air is cold, and humidity is high. Then it causes the water vapor to condense into droplets that the gel holds. When the heat rises during the day, the gel releases water vapor. If covered by clear plastic, the released vapor is trapped, condenses back into liquid water, and flows into a storage container.

Peng Wang, an environmental engineer at Hong Kong Polytechnic University, and his colleagues figure out another use for the condensed water: coolant for solar panels. So, the researchers applied a 1-centimeter thick sheet of the gel against the underside of a standard silicon solar panel. Their idea was that during the day, the gel would pull the heat from the solar panel. It initiates an evaporation process for the water it pulled out of the air the previous night, releasing it through the bottom of the gel layer. Thus the gel-like material can make solar panels “sweat" and cool - just like sweating cools the human body. The amount of gel needed per panel depends on its size and the temperature and humidity in your location. In a desert environment with 35% humidity, a 1-square-meter solar panel required 1 kilogram of gel to cool it. In a muggy area with 80% humidity, only 0.3 kg of the gel is needed per square meter solar panel.

The temperature of these solar panels can drop to 10°C/50°F, and the electricity output of the panels can increase by 15% to 19%. In the area of solar technology, this is considerable. “In a field where engineers struggle for every 0.1% boost in power conversion efficiency, even a 1% gain would be an economic boom,” says Jun Zhou, a materials scientist at Huazhong University of Science and Technology.

One disadvantage of this solution is that rain could dissolve the calcium chloride salt in the gel, sapping its water-attracting performance. Peng Wang acknowledged this as a possible problem, despite the hydrogel sitting beneath the solar panel, and being somewhat shielded from the rain. He said he and his colleagues were working on a second-generation gel that would not degrade, even when wet.

The team is also looking at another design option that could trap and re-condense water after it had evaporated from the gel - and potentially using the collected water to clean solar panels from the dust.

Currently, over 600 gigawatts of solar power exist worldwide, providing 3% of global electricity demand. This number may increase by about five times over the next decade.

Source: sciencemag.org