Tag Archives: solar panel installation

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.

Choosing a Solar Installer: Checklist for choosing a Solar Company in Ontario

28 Jun

Choosing your solar installer can be a big decision and we understand it’s not the simplest one either. With infinite options available just with a simple Google search, the question quickly becomes how do you choose the best one? How do you know if they’re good and how do you know if they’ll do the best job for your home?

Ontario's most trusted solar company, Eco Alternative Energy

Choosing the right solar company for your home: Ontario

In order to help you out, we decided to create a simple checklist to help you make this decision. It’s a list of short questions that you can ask any solar company or installer you are considering to see if they are the right one for you.

1. Licenses and Insurance: Ask your solar company if they have the appropriate licenses and insurance; especially for the workers involved in your installation. It’s a wise thing to do so that you do not end up with a potential liability claim. And if they are reluctant to disclose whether or not they have it, you’re probably better off with another company.

2. How long have you been installing solar?: The last thing you want is an installer working out of his basement or installing solar on the side. You need a reliable company that has been around for 5 or more years and installing solar needs to be their primary business, not a roofer who sometimes installs solar or an electrician who does it on the side. You want to ensure that they have a place of business that you can actually walk into and see a solar panel for yourself.

3. Are the installers actually employees or subcontractors?: Sometimes, solar companies subcontract their services to reduce labour costs. The trouble with choosing a company that uses subcontractors for their installations is that you might know and trust the solar company but you know squat about the subcontractors – this can create quite a dilemma and one that you want to avoid. There’s also the off chance that they won’t follow “company procedure” during an install. Always choose a solar company with in-house installers and like CanSIA (Canadian Solar Industries Association) says ‘reduce your risk’.

4. How realistic are the ROI (return on investment) projections?: This is one of my biggest pet peeves! Some solar companies (not all) tend to present over inflated ROI projections to customers to get you to sign up. Since they show your return to be higher than what it will actually be, your system purchase looks that much more attractive as they will come out with unrealistic expectations saying you’ll earn 12 to 17% return on your money when in fact, you will actually earn closer to 10%. Once they have sold you, it will take a few months before you realize that you’re not meeting their projections and by that point you’ll have no recourse to take when your monthly cheques don’t match what they suggested when you made the purchase.

Instead, ask them how they calculated the ROI, and whether or not they accounted for shading, snow etc. You can also ask for past records of solar projections and hydro payments of some of their previous customers – WITH contact information. Please have them review with you how they got to their performance projections and ensure that you understand! They should be able to go through their process with you so you have a clear understanding.

5. What does their price include?: Since you are not a solar professional you’ll probably not be as familiar with the all the details involved with your installation (building permits, engineering, connection costs, squirrel guard, etc). Ensure your solar installer clearly states what’s included in the price and more importantly what their cost does not include. No one wants surprises at the end of the day that they were not counting on.

6. Who files the microFIT / FIT application?: It’s a good thing to ask your solar company if they’ll file your application or will you have to do it, because you do not want to be struggling with paperwork – especially something that’s key to your installation. Besides, the biggest plus about a Solar professional filing your application on your behalf is that they are familiar with the process and know the intricacies involved.

7. Warranties and References: Like for any purchase; always, always, always ask what the warranties cover and for a few references. It’s the first thing that should pop in our head when we make a purchase – especially something that requires a big investment, so don’t be shy about asking for warranty information and some references you can talk to.

Feel free to print this list off and have it by your side when you speak / meet with solar companies you are corresponding with. Go over these questions with any potential solar installer one by one. At Eco Alternative Energy we adhere to all the above standards because we believe customer satisfaction comes first. And in case you are wondering what should be included in the cost of your solar system, here’s a great post that lists it for you: How much does it cost to install solar panels? For any questions that you have regarding choosing the right installer or solar don’t hesitate to drop us a message or call us at 1-888-907-5848.

And remember don’t sign up with a solar company just because they seem to be offering the best price – like they say, if it’s too good to be true, that’s because it probably is!

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.