Archive | July, 2013

How will shade affect the performance of my Solar Panels?

19 Jul

It’s common knowledge that vampires can’t stand garlic, that the Joker is Batman’s nemesis and that oil and water simply don’t mix. The same can be said about solar panels and shade. They simply don’t work well together.

Solar panels installed by Eco Alternative Energy at a house in Ontario

Solar System installed by Eco Alternative Energy

Solar modules are designed to convert solar radiation (otherwise known as sunlight) into electricity which will then either be sold to your local Hydro Company in a grid tie scenario or used to charge batteries in an off-grid system. When a panel is blocked by a shadow (either by a cloud, a chimney, or tree branch, etc), it can reduce the performance of your system dramatically.

Without getting too complicated, imagine a standard solar panel on its side, in a landscape position. Now divide the solar panel in two with a top half and a bottom half. Each half is a circuit interconnected together in series (30 cells in each half for a total of 60 cells). When you shadow any of the cells in either of these two half’s, the voltage of the solar panel will drop in order for the panel to protect itself. Even if only one of the 30 cells in that section of the panel is covered,  it will have a dramatic effect on that half of the panel and potentially on the system as a whole depending on whether you decide to go with a string or micro-inverter (future blog coming soon).

Some common shade considerations you will need to look out for include chimneys, hydro wires, dormers, TV antennas, snow, neighbouring houses and of course tree branches (doesn’t really matter if its winter or summer as the shadows of branches in the winter alone can still have a significant impact on your system). Do shadows from these obstructions mean that you can’t add solar to these areas of your roof? Not necessarily.

Solar Pathfinder: Eco Alternative Energy

Solar Pathfinder: Eco Alternative Energy

Your solar installer should have the knowledge and expertise in choosing the best areas of your roof to add your panels that will maximize your return on investment. He or she may avoid certain areas due to constant shade obstructions but it’s important to keep in mind that some shadows may affect a panel in the morning however may not affect the same panel the rest of the day – resulting in overall good performance. That’s  because shadows move throughout the day as the earth moves (but I know you already knew that).  Solar installers should have the tools, like a Solar Pathfinder, that will allow them to make educated decisions on the best places for you to add your panels. With the Solar Pathfinder tool, they should be able to predict your solar systems performance based on any obstructions you may have on your roof. It doesn’t matter what time of year they do the analysis – the tool is smart enough to give results for the entire year with surprising accuracy.

We hope you found this article on shade helpful. If you would like to have a shade analysis done on your roof, drop us a message here or call 1-888-907-5848. We have three locations to service you (Toronto GTA, Sharbot Lake and Peterborough) and we would be happy to help you out. You can also find out about other posts to many of your common questions here on our blog.

If you are in Ontario, Canada and would like a free online evaluation of your property for solar, feel free to fill out the short form below and one of our experts will get in touch with you in 1 business day.

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Solar Systems: What could possibly go wrong?

17 Jul

So, you’re considering investing a rather large chunk of money to have a solar system installed at your home with the benefit of receiving a preferred rate for the electricity you generate that will be guaranteed to you for 20 years through Ontario’s MicroFIT program.

Now you’re wondering what could possibly go wrong in the coming years.  After all, it’s good to know about any problems that may arise now so that you’re going into this with your eyes wide open. By planning now for potential problems down the road, you can most likely prevent nasty service issues in future years.

The good news is that for most solar systems, there is very little that can go wrong. Solar panels have no moving parts which makes maintenance virtually non-existent.  As for cleaning the panels, here in Ontario, we typically get a good rainfall once a week which naturally cleans the panels of any dust or debris. Solar panels typically come with a 25 year warranty so you’re covered in that respect.  As for the inverter(s), they often come with a 10-25 year  warranty (term will depend on the inverter you choose, so choose wisely).

Squirrel damage to solar panel wiring

Squirrel damage to solar panel wiring

If there was one thing that could potentially go wrong with your system, I would hazard to guess that it would be our furry little friends, squirrels.  If your roof is near an area accessible to squirrels, they could decide to call your solar array home and set up a nice nest underneath your solar panels to protect them from local predators and the elements.  However, a bigger concern than the nesting is what they do when in their new digs.  You see, squirrels like many rodents like to chew and the wiring under your panels make a great snack for their little chompers.  The damage that these little critters cause to wiring can result in thousands of dollars worth of repairs as your solar installer will not only be required to remove the panels, but also replace all of the wiring affected by squirrel damage.  In the meantime, you’ll be losing production which also costs you money.  Now for the really bad news, most insurance companies do not cover rodent damage which means that you’ll be on the hook for this bill. The solar industry  has been experimenting with various  solutions to this problem (coating the wires with a nasty taste that squirrel’s will naturally want to keep away from and protective wiring) but to date they have not provided us with a cost effective solution.  So is all hope lost? – Nope.

Squirrel Guard installed around solar panels

Squirrel Guard installed around solar panels by Eco Alternative Energy

The good news is that some solar companies are now providing customers with a product called Squirrel Guard which in essence is a galvanized steel screen that is installed around your panels and acts as a deterrent so that squirrels (or birds for that matter) are unable to get under your solar system to wreak havoc.  The Squirrel Guard screen is made by welding and hot-dip galvanizing, followed by PVC coating (this ain’t no chicken wire).  This high quality screen stands up to the extremes of rooftops.  It combines just the right mix of strength and weight with workability and transparency for a quick, long-lasting, secure and inconspicuous installation.  Squirrel Guard is the most effective solution so far for squirrel damage to solar panels.

Be sure to ask your solar installer if they provide Squirrel Guard before you sign up especially if you know you could potentially have a squirrel issue either now or down the road.

We make it a point to inform our customers about Squirrel Guard before signing up.  If you would like to speak to a solar specialist for a high performance squirrel protected solar system, please Contact Us or call us at 416-907-5848.

Which Solar panel type is best: Monocrystalline or Polycrystalline?

11 Jul

There’s a great deal of interest about Mono-crystalline and Polycrystalline Solar Panels. As such, we decided to do a comparison from your point of view and we will try to avoid using any trade jargon to give you a better understanding of the difference between the two options: Mono and Poly solar panels.

Surface of Monocrystalline Solar Panels

Surface of Monocrystalline Solar Panels

Monocrystalline cells are made from a single crystal of ultra pure silicon. They are the original silicon solar cell and they are still the most efficient today. Mono cells are typically a little more expensive since they’re a little more difficult to manufacture. The benefit of mono cells is that they perform slightly better under low light conditions equating to better production on cloudy days versus polycrystalline panels. How much better? Well that is a topic for discussion as there has been little local data to prove this here in Ontario. Suffice to say, you may get up to about .5% better production per annum using mono cells versus using polycrystalline.

A Polycrystalline Solar Panel: by Eco Alternative Energy, Ontario

A Polycrystalline Solar Panel

Polycrystalline cells are made up of multiple crystals and are generally less expensive to manufacture than mono cells. The gap in performance has narrowed significantly over the years to the point where they are very close. Since Polycrystalline panels are made up of several crystals, this means that they also absorb less sunlight and produce slightly less than mono cells per metre squared.

Many Solar panel manufacturers here in Ontario offer both mono or poly options. Ask your installer what they recommend for your roof and maybe have them quote on both. If you are in Ontario, Canada and you’d like to drop us a message you can do so here or call us at 1-888-907-5848.

In short, both are good technologies. It’s simply a matter of personal preference and budget. In case you wanted to find out how much a solar system installation typically costs, please read our post on How much does it cost to install solar panels in Ontario? We hope you find it helpful! For any questions feel free to drop us a comment below.

If you are in Ontario, Canada and would like a free online evaluation of your property for solar, feel free to fill out the short form below and one of our experts will get in touch with you in 1 business day.

Solar System Installation: Is it better to do the install yourself? Professional vs DIY

4 Jul

Whether you choose a professional to install your solar system or decide to do it yourself, kudos to you for choosing to go solar and thank you for helping us make Ontario greener!

Professional Solar Panel Installation by Eco Alternative Energy, Toronto

Why choosing a professional solar installer is better: Grid Tied Solar Systems Ontario

A lot of hobbyists jump at the idea of a DIY project but hold on, before you put your tool belt on and start climbing up the ladder onto your roof you need to ask yourself; “which option is better for such a significant project”?

If you’re planning to install a Grid Tied Solar System, we recommend you take a look here at what a Professional Solar Installation company offers you vs a DIY project:

  1. Professional Expertise: The first advantage of using a professional company to install solar panels on the roof of your home is that they employ professional electricians, installers and solar specialists to do the job right. This means that everyone involved in your solar installation is an expert in their field as opposed to a hobbyist trying to figure things out for the first time. If you’re planning on doing a small home project that does not tie into the grid, then the Do It Yourselfer (providing he or she is handy in this regard) may be a better option.
  2. Making the best recommendations: A professional Solar company will be able to make the best choices for your solar system. They will know exactly which system design will be the most lucrative, which inverters to use, which racking to go with and all this faster than you can type “Photovoltaic” on your browser. It is unlikely that hobbyists will know the best configurations of a system and still be able to maximize production, since they probably don’t account for factors such as shading, preferred azimuth, pitch, etc.
  3. Time Savings and Faster Earnings: When you start a DIY project for the first time on your own, you will evidently go through the many panel brochures, inverter info and engineering specs and eventually find a simple flowchart of steps required to install Solar that you may use as a template for your installation. It is unlikely that you’ll finish your project without running into a few roadblocks which could potentially take a while to figure out. When using a professional solar installation company, you’ll be dealing with professionals who have been through the process several times and understand their way around any roadblocks they encounter. As a result, they should be much faster (a 10 kW system should be installed by professionals in about 5 days) and your system will start producing sooner which in turn equates to you earning money faster.
  4. Trying to save money: Keep this in mind, the cost of your average solar system is primarily made up in the panels, inverter(s), rails and electrical. Labour is a very small percentage of the overall price tag.
  5. Paper work made easy: Are you fond of provincial red tape? Like the rest of us, probably not – especially when you don’t do it on a regular basis. Filing for your OPA (Ontario Power Authority) application to get approved is the first step to installing a solar system and a service that many solar companies are happy to provide. Then comes the LDC paperwork, single line diagrams and in many cases engineering and a building permit. Having your solar installer take care of this for you will save you the headache and time of shuffling through what some describe as an endless sea of paperwork. Similarly, solar companies take care of the majority of other paperwork required in the process so you don’t have to worry. If you are taking up this project as Do It Yourselfer the paperwork will slow you down, not to mention the unnecessary stress associated with it.
  6. After service care: It’s a great relief to know that someone will be around to look into any trouble that your system runs into long after your installation is complete as opposed to getting up on the roof every time something goes wrong and making sure you are around to fix it. Most solar companies will be available to provide you with some form of after service care on your system. Many solar installers offer a 24-36 month warranty on their installation.

So at first glance, it might look cheaper to install a Grid Tied Solar System on your own or have a friend do it but in the long run it could turn out to be more of a headache than it’s worth. To make solar a truly rewarding and wonderful experience we suggest you choose a professional solar installer for your home. And if you’re considering looking into choosing a solar company in your area, please read our post on How to choose the right solar installer: a checklist for some great tips! Like always, our solar experts will be happy to answer any questions you have, so be sure to drop us a message here or call us on 1-888-907-5848 .

If you are in Ontario, Canada and would like a free online evaluation of your property for solar, feel free to fill out the short form below and one of our experts will get in touch with you in 1 business day.