Considerations When Mounting Solar Panels
After you purchase your solar panels, you will be faced with some decisions about their installation. How will your solar panels be mounted? What pa...
After you purchase your solar panels, you will be faced with some decisions about their installation. How will your solar panels be mounted? What parts will you need? If you are like me, then no matter which direction you choose the system should be reliable and secure.
A popular method is to mount one’s solar panels on top of their roof. It is a simple and convenient solution, and so most folks attach their solar panels this way. Most often these mounting parts can be purchased right off the shelf.
We would like to point out a couple issues with mounting solar panels on the roof, however. They are things to keep in mind for folks who live in northern climates, or who desire more optimal performance.
The first issue we encountered was dealing with snow. Snow storms are common in my neck of the woods, and sometimes there is snow pack all Winter long. Whenever there is the slightest amount of snow fall, the solar panels must be cleaned. Snow covered glass will severely inhibit their ability to produce electricity.
In the mountains of Washington and Colorado, we have been working on a solution. We are designers and craftsman who desire convenience and performance with our own home based solar power systems. And like everyone else, we don’t want to spend an arm and a leg. We call this solution the Rotek system.
In a Rotek installation, the solar panels are mounted on a ground based structure instead of the roof. This provides the clearances for adjustability, so that we can rotate the solar panels in any way. With this in place we can make seasonal adjustments to match the Sun.
In the Winter is when this adjustability can be a big help. The solar panels can be pitched more steeply or rotated toward the ground (negative tilt) to keep the snow off the surface. It is also good for giving the glass an occasional cleaning.
Whether for one snow storm or for a period of weeks, as long as there is snow on the ground you can leave your solar panels at negative tilt. As we have all witnessed, snow pack is highly reflective. Your system will continue to receive lots of beam radiation despite this abnormal tracking angle.
The second big issue to consider is heat. As our roofs accumulate heat, they will increase the operating temperature of a roof mounted solar panel. Performance tests have shown that higher operating temperatures will reduce the solar panel’s discharge current. This lost current output can be as high as 2 or 3 amps depending on the unit, which correlates to better than 20% energy lost against baseline operation.
Remotely mounted solar panels with Rotek system will dissipate heat, run cooler, and give you better performance. This is because of fresh air circulating on the back end, instead of a warm insulated roof. This reduced operating temperature will also decrease wear and tear and help increase the longevity of your system.
So now that the decision is made to install your solar panel system, you must choose a mounting configuration. The roof mounted options are simple and in many cases a good choice. For those who want a little more performance and design flexibility, the Rotek system is a reliable and inexpensive alternative worthy of consideration.
Walter Hull is a mechanical engineer with expertise in solar power systems. For a limited time you can get his free report to from your own yard.