Solar Power Generation Winter vs Summer
Shorter days, cooler temperatures, and a lower angle of the sun can significantly impact your motorhome’s solar efficiency. If you’re travelling to the South Island, you’ll face even fewer daylight hours. But even those staying in the North Island will see reduced solar production over winter. Being prepared now means enjoying a comfortable, hassle-free trip—no matter where you roam.
Why Winter Sunlight is Different for Winter Solar Production
In winter, the sun sits lower in the sky. This change in angle reduces the intensity of sunlight hitting your panels, affecting solar panel performance, so you collect fewer total watt-hours each day. Your motorhome’s battery may not recharge as quickly, leading to days where you run out of power and shorten the overall life of the battery
Sun Angle:
During winter, solar panels can receive up to 30% less direct sunlight compared to summer.
Daylight Hours
In some parts of New Zealand, winter daylight hours can be 2–3 hours fewer than in peak summer months.
The Role of Temperature and Temperature Coefficients
Solar panels are more efficient in cooler temperatures, which is great news for winter travelers. When temperatures drop below 25°C, the efficiency of solar panels can increase by up to 0.5% per degree. This means that in cooler climates, your solar panels can produce more electricity, making them ideal for regions with mild winters.
However, it’s important to note that extreme heat can have the opposite effect. High temperatures can reduce solar panel efficiency and limit power production. While solar panels are designed to withstand high temperatures, prolonged exposure to heatwaves can impact their performance. So, if you’re traveling to warmer areas, keep an eye on your solar panel output and consider additional cooling measures if necessary.
5 Ways to Boost Your Winter Solar Panel Efficiency
Swap out PWM for MPPT
MPPT (Maximum Power Point Tracking) controllers can provide up to 50% more energy capture compared to basic PWM controllers, especially in low-sun conditions. MPPT controllers can significantly enhance solar panel energy production.
Angle Your Panels More Steeply (if possible)
By adjusting your panel angle to face the lower winter sun, you increase the amount of direct sunlight that reaches the cells, helping your panels generate electricity more efficiently.
Keep Panels Clean
With shorter daylight hours, every ray counts. Regularly remove dirt, leaves, or snow.
Check Your Batteries & 12V System
Cold weather can reduce battery efficiency. Ensure connections are secure, and the battery itself is in good condition.
Use a Diesel Heater
A diesel heater is an efficient way to stay warm without draining your electrical system.
Energy Storage Solutions for Solar Energy
Energy storage solutions, such as batteries, are a game-changer for solar energy systems. These systems allow you to store excess energy generated by your solar panels during the day for use at night or during power outages. This not only maximizes your energy independence but also reduces your reliance on the grid.
By storing excess energy, you can significantly lower your energy bills and increase your overall energy efficiency. Energy storage systems also help stabilize the grid by providing a buffer against sudden changes in energy demand. This means that even during periods of low sunlight or at night, your solar energy system can provide a reliable and sustainable source of energy.
Investing in energy storage solutions ensures that you have a consistent power supply, no matter the weather conditions. Whether you’re on a short trip or a long journey, having a robust energy storage system in place will keep your motorhome powered and your travels worry-free.
Next Steps
Preparing your motorhome for winter means understanding how the sun’s lower angle affects your solar yield, and taking steps to maximise efficiency. Understanding how the sun’s lower angle affects your solar energy production is key to maximizing efficiency. By swapping to MPPT, angling panels, maintaining your 12V system, and even integrating a diesel heater, you’ll stay warm and powered—whether you’re heading south or sticking closer to home.
Don’t miss out on our April Special: Book your assessment now, accept your quote within seven days, and claim your 10% discount. A little planning now ensures a worry-free winter on the road with optimized energy production.
FAQs
How long does an upgrade take?
Typically, an assessment and installation can be completed within a few days, depending on parts availability.
What if I’m not travelling far this winter?
Even short trips can be impacted by reduced solar yield. An efficient system ensures you’re comfortable wherever you go.