Guest Post: Colin Derhammer, Partner at JCD Solar Consulting (operating as Melink Solar Development), a leading expert in pre-construction solar development, draws on over two decades of engineering experience to provide insights into the longevity of commercial solar panels. With a deep understanding of the technical, financial, and environmental factors that shape solar energy systems, Colin helps businesses navigate the complexities of renewable energy to maximize their return on investment. In this Q&A, he explores the factors that influence the lifespan of solar panels and offers expert guidance for ensuring your commercial solar array performs optimally for years to come.
When it comes to investing in commercial solar energy, one of the most common questions business owners ask is, "How long will my solar panels last?" The answer is crucial for making a sound investment and planning for long-term energy savings.
Catalyst Power: What factors influence the lifespan of commercial solar panels?
Colin: Environmental factors generally impact PV modules. Dirt and debris can cause premature soiling, and without proper maintenance, they can reduce the output of your solar array. Proper installation is key, so you want a reputable company to install your array.
(Editor’s note: Catalyst Power-owned systems are operated and maintained at our cost.)
Catalyst Power: Do environmental conditions affect how long solar panels last, and is the weather in the Northeast particularly harsh or friendly for solar panels?
Colin: It may seem counterintuitive, but voltage actually flows better in colder weather climates like that of the northeast. At colder temperatures, atoms are packed tighter, creating less resistance for electrons to flow.
Catalyst Power: Does panel quality or construction impact longevity?
Colin: Absolutely; we advise using only Tier 1 modules, which are considered to be the most reliable and highest quality. Highly bankable manufacturers make these modules; they have typically been around for several years and use reliable, automated manufacturing techniques.
Catalyst Power: How much do commercial solar panels degrade each year?
Colin: Almost all Tier 1 modules are warranted for 30 years. They will slowly degrade during that time, but most are guaranteed to lose less than 1% to 2% in the first year and 0.4% to 0.6% or less each additional year.
Catalyst Power: What is the expected efficiency of solar panels after 10, 20, or 30 years? In other words, will my panels generate the same amount of energy 10 or 20 years from now?
Colin: After 10 years, most bankable modules will generate 92-95% of their rated output; after 30 years, this number would be about 85%-87%. In other words, a 500W module could still generate up to 475W after 10 years and 435W after 30 years.
Catalyst Power: What common issues can reduce the longevity of solar panels?
Colin: Common issues are accidents, improper maintenance, or other acts of God. Outside of that, PV modules have no moving parts, so once installed properly and regularly maintained, there are very few issues.
Catalyst Power: Are commercial solar panels designed to withstand extreme weather? E.g., hurricanes, hail, blizzards, etc.
Colin: Like any other building or infrastructure, solar arrays are designed to withstand the elements. Industry standards are tested and certified by UL to pass tests for performance, salt mist corrosion, ammonia corrosion, dynamic mechanical load (hail), and more.
Catalyst Power: What is the typical warranty period for commercial solar panels?
Colin: 30 years.
Catalyst Power: What happens when solar panels reach the end of their warranty?
Colin: Most continue to operate unless they get upgraded or replaced.
Catalyst Power: How often do inverters or other system components need to be replaced compared to panels?
Colin: The inverter is the only other component needing replacing before the PV panels. Most carry a 5- or 10-year warranty, sometimes with the option for longer. A savvy project owner will assume the cost of replacing the inverter(s) around year 15.
(Editor’s note: Catalyst Power-owned systems are operated and maintained at our cost.)
Catalyst Power: What happens to commercial solar panels at the end of their lifespan?
Colin: At the end of its lifespan, it is recommended that PV modules be recycled, as most components can be broken down and reused.
Catalyst Power: Are commercial solar panels recyclable?
Colin: Yes, they are, and you can find a reputable recycling option through the Department of Energy Solar Technologies office or the Solar Energy Industries Association (SEIA).
