Winter is Coming! 5 Ways the Changing Seasons Impact Renewable Energy Systems
In many parts of the northern hemisphere, the leaves are falling, temperatures are dropping, and winter is just around the corner. Many people pay attention to the turning of the seasons because it means they need a new coat -- but for those who utilize solar and wind energy, it’s even more important to understand how this change affects PV and wind energy systems.
1. Renewable energy is site specific
Unlike coal or natural gas power plants, which basically function the same way no matter the location, both solar and wind systems are inherently dependent on their location and the time of year. Renewable energy system designers plan for these changes, utilizing weather data, insolation maps, anemometers, and modeling software to ensure the system is reliable and efficient all year round. Often this means designing a system based on the historically least sunny and windy day of the year.
For example, near the equator, insolation is almost constant year-round, whereas polar regions have very little sun during the winter months. Because this is so site specific, renewable energy systems are most productive and cost effective when they are customized to their unique environment.
2. Solar panels are more efficient in cold temperatures -- but winter days are shorter
Panels capture energy from photovoltaic light -- not from the sun’s heat. In fact, heat actually reduces the efficiency of solar panels, but during colder months, their energy production can increase by up to 15%. Despite this benefit of cold weather, winter days have fewer daylight hours, so the net change of amount of energy produced will be lower than during other times of the year.
3. Winter in most regions brings stronger winds
One way to make up for this loss of solar panel efficiency is to incorporate wind, creating a hybrid renewable energy system. Winters in most regions tend to bring stronger winds, which help offset the loss of production seen from PV. This same balanced system design can also be applied to differences between day and night, where solar panels produce energy from light during the day and wind turbines take advantage of nighttime winds.
4. Battery chemistry varies with temperature
Batteries often have reduced efficiency at extreme temperatures. In order to account for this loss, renewable energy system designers must assess the energy needs and the site resources. In some extreme climates, it may be advised that electronics and batteries are housed in a temperature controlled enclosure.
5. Snow falling on solar panels: Preparing for winter storms
Snow and ice can cause added load on solar panels, so this possibility should be factored into structural design as well as energy production estimates for the winter season.
The good news? While winter weather often brings increased power outages, renewable energy systems designed for off-grid use can provide uninterrupted electricity, even when power lines go down. Microgrids, as well as backup storage, are becoming increasingly popular for the added resiliency and energy security they provide.
Conor Trujillo is a senior system design engineer at UGE, a leading developer of distributed renewable energy solutions for business and government, with projects in over 90 countries, including several for Fortune 1,000 companies.
Toyota unveils electric van and Volvo opens fuel cell lab
Toyota is launching its first zero emission battery electric vehicle, the Proace Electric medium-duty panel van, across Europe.
The model, which offers a choice of 50 or 75kWh lithium-ion batteries with range of up to 205 miles, is being rolled out in the UK, Denmark, Finland, France, Germany, Italy, Spain and Sweden.
At present, alternative fuel vehicles (AFVs, including battery electric vehicles) account for only a fraction – around 1.8 per cent – of new light commercial van sales in the UK, but a number of factors are accelerating demand for practical alternatives to vans with conventional internal combustion engines.
Low and zero emission zones are coming into force to reduce local pollution and improve air quality in urban centres, at the same time as rapid growth in ecommerce is generating more day-to-day delivery traffic.
Meanwhile the opening of Volvo's first dedicated fuel cell test lab in Volvo Group, marks a significant milestone in the manufacturer’s ambition to be fossil-free by 2040.
Fuel cells work by combining hydrogen with oxygen, with the resulting chemical reaction producing electricity. The process is completely emission-free, with water vapour being the only by-product.
Toni Hagelberg, Head of Sustainable Power at Volvo CE, says fuel cell technology is a key enabler of sustainable solutions for heavier construction machines, and this investment provides another vital tool in its work to reach targets.
"The lab will also serve Volvo Group globally, as it’s the first to offer this kind of advanced testing," he said.
The Fuel Cell Test Lab is a demonstration of the same dedication to hydrogen fuel cell technology, as the recent launch of cell centric, a joint venture by Volvo Group and Daimler Truck to accelerate the development, production and commercialization of fuel cell solutions within long-haul trucking and beyond. Both form a key part of the Group’s overall ambition to be 100% fossil free by 2040.