Malaysians know heat. So do solar panels. But while sunlight is essential for solar power generation, too much heat can quietly sabotage efficiency.
Solar panels operate best at around 25 degrees Celsius. Go past that and for every degree higher, performance drops by 0.34 to 0.5 percent. In real numbers, your system could be running up to 7 percent below optimal during one of Malaysia’s 37 to 40 degree afternoons.
Take the UK’s 2022 record-breaking heatwave as an example. Temperatures hit 40.3 degrees and solar panels still made a decent dent in the national power supply. But on an individual level, those panels were working about 5 percent below their peak.
Malaysia’s blazing sun offers year-round generation potential, but those gains flatten out during extreme heat. Proper ventilation, high-quality inverters, and strategic installation help mitigate thermal stress, but they do not eliminate it.
Still, the long-term benefits are hard to argue with. Panels last up to 30 years and depending on system size, roof angle, and usage habits, most homeowners see returns within five to 13 years. The more electricity tariffs rise, the quicker that break-even point comes.
If you are wondering whether installing solar is still worth it in a tropical climate, the answer is yes. Just remember that while solar power loves the sun, even it has its limits. Heatwaves do not supercharge your panels. If anything, they make them sweat a little too.
