How to Remove Snow from Solar Panels

Yesterday marked the official start of winter.  That means snowy weather in Massachusetts is imminent – actually as I look out my window, I can assure you that it’s here.  If you’ve invested in solar power, you want to make certain your photovoltaic (PV) system will continue to produce power throughout the cold season.  In New England, other than the shorter days, the biggest hindrance to solar energy production in the winter is snow.   I’m going to tell you a few ways to keep the snow off of your investment.

First off, I don’t think it is necessary to clean your solar panels after every single snowfall, or any snowfall for that matter.  The roof of most homes is not easily accessible and it is not worth putting yourself in a dangerous situation to clean off the panels.  If your roof is easy to get to and you have the time and energy to clean your panels, then clearing the snow will help with solar energy generation, especially after a good storm.

Your best options to remove snow from solar panels include:

  1. Wait it out.  Your home’s roof is most likely pitched.  The steeper the pitch, the quicker the snow will run off.  Your solar panels are made of a slippery glass.  When a corner of the panel is exposed, it heats up the rest of the module and snow will easily slide away.   In the case of heavy accumulation, this could take more than one day to melt.
  2. Hose it down.  A lot of homeowners choose to spray their array down with a pressurized hose.  This may quickly take care of snow accumulation, but be aware that this may backfire if temperatures are below freezing.  I wouldn’t recommend replacing a sheet of snow with a sheet of ice.
  3. Rock salt, RainX, or car wax.  No thanks.  I have heard of people using rock salt to melt snow from solar panels, but I don’t think this is a smart move.  Salt can cause damage to your roof shingles and stain your siding.  I’ve never tried RainX or car wax, but I wouldn’t suggest either.  Your solar panels have a warranty and using a foreign substance on them may void that agreement. The risk just isn’t worth the reward. 
  4. Play some football.  I’ve seen some discussion forums mention using a nerf football to shed snow from your roof.  The logic is once you have the smallest portion of the panel exposed, it will heat up the rest of the module and the snow will skim off.
  5. Retrofit a roof rake.  You can find a roof rake at most hardware and department stores in New England for about $50  It typically has an aluminum blade use to remove snow from the roof and prevent ice dams.  The conventional roof rake can damage to roof shingles and solar panels so it is important you add a squeegee type device to the blade to protect your equipment.
  6. Buy a telescoping soft roof rake.  Roofrake.com sells a 24 Foot Telescoping Extra Soft Snow Pro for $65.  Its telescoping capabilities allow you to reach areas of your roof from the ground and its durable foam head ensures that your PV panels will be free of damage.

I would love to hear other ways people are making sure their solar array is clear of snow so please include any other suggestions.  If you’re interested in solar panels for your home or business in Massachusetts, Brightstar Solar offers a complimentary solar evaluation and free estimate.   During our appointment, we would be happy to answer any questions you have about the installation or associated maintenance required.