Month: February 2021

2003. The ‘Strawberry Hill’ fire is raging just on the edge of Kamloops BC. The air was so hot it felt like it was searing my lungs while I worked outside in the heat and smoke. I was working feverishly to get renovation waste wood out of my yard, in case the fire spread to town. And I was thinking and planning. I was planning on studying and training to promote and be involved in building as much grid-tied renewable energy possible. I was frustrated by the lack of local and national action on climate change. I was also tired of being sensitive to all the toxins and crap in my conventional home and realizing it would be very difficult to rebuild it ‘clean’.

Women designers and builders

In the back of my mind I had always thought I might one day build a log home or cabin, like the log home my father built that I grew up in and like another solo woman before me, Chris Czajkowski had built in the Chilcotin wilderness of BC. Her independence and strength in building her own remote log home by hand in the wilderness had been inspiring me since my youth when I read an article in a magazine about her work.

But logs burn. Locally, the symptoms of climate change were erupting rapidly. The Ponderosa pine trees that were a significant part of our local landscape were dying in large numbers, attacked by beetles that were no longer restricted by cold winters. The fires and the changes in the forest and grassland ecosystem that I loved so much was driving me to do more. This fire made me remember the straw bale homes I’d also read about over the years. Perhaps, I thought, they would be more fire resilient due to their plastered surfaces?

Fast forward a year. I am studying renewable energy and sustainable building in Colorado and I learned even more reasons to build with straw and clay: in addition to fire resiliency and being toxin free, I learned more about total embodied energy and carbon footprint; the values of reduced use of cement and building for longevity so that the high energy cost of construction is spread over as many years as possible. We sequester the carbon of the wood and straw in the building as well, another plus.

Ideally, building one less new building at all would be best for the planet. For me, my health concerns and desire to be farming, were driving a plan that I could justify my creation of the home of my dreams on a larger piece of land than my small city lot. A low-embodied energy, clean and fire resilient, truly sustainable home. You don’t need plastics, synthetic materials and expensive materials to build a healthy, cosy home. In addition, it turns out, a natural home, does not have to be a rough, simple hut as many people imagine, they can be quite luxurious and beautiful. The downside: A lot of labour.

I grew up on a farm and have always been physically strong, familiar with hard physical work and good with handling tools, with experience in construction, engineering and landscape construction, as well as having learned some basic building science from my older architect brother. I thought I could do it. If Chris could do what she did far in the wilderness, I could do this near a major city like Kamloops.

Natural Builders

In my studies looking for what sustainable systems really worked, I also had learned of and later had the privilege to meet some of the strong, industrious women and men working in natural building and natural plasters, like Athena Swentzell-Steen, Bill Steen, Craig Hillman, Sukita Crimmel and Tracy Theriot. I visited many straw bale homes while traveling to study renewables and natural building in both Colorado and BC and worked on several as well.

Living Buildings

The Living Building Challenge (LBC) had recently begun its program to encourage truly sustainable building; they had established a system that was the highest certification system in the world to guide more sustainable construction. I pored over the requirements and studied the materials Redlist. I visited the Eco-sense home, the first LBC-certified residential home and conveniently a few hours from me on Vancouver Island. I was duly impressed by the innovative seismic design of their home done by engineer Tim Krahn, which supplied a crucial missing link for me as I discovered I needed a structural engineer with natural materials experience. Turns out, most engineers have no idea how these materials work.

In my work as an Energy Advisor, I had heard stories of some straw bale and alternative built homes that were built poorly, with problems like mould and excessive air leakage. I wanted to ensure I didn’t make any mistakes, as that leads to slower adoption of alternatives, giving building professionals a poor impression of these homes. I wanted to create a healthy and sound home that building inspectors would be happy with, to aid in the understanding and acceptance of these materials.

My property search took a couple of years. I was looking for arable land, good water and a site with a quite wide-open solar resource. If one is installing solar electricity, you need a ‘good’ solar resource, with at least several hours of sun per day for at least a good part of the year (depending on your needs or investment requirement). For using solar for heat as I was planning, ideally I needed the most solar I could get: the most hours for as much of the year as I could find. Oh, and it needed to be reasonably near to town (ideally reasonable cycling distance), have roads maintenance – and be very affordable (alot of asks!).

Once I had a property, I got to work on many hours of research on materials and the search for suppliers and contractors who either were familiar with what I needed or at least were willing to learn and work with them (not as easy as you might think). I began my basic design and started sourcing materials and contractors.…

One of the most essential things about sustainable and natural building is to ensure that the overall design from the very beginning, is based on its sustainability. Many problems in buildings happen when green items are simply added to a conventional design. Many of these materials behave differently than standard materials, so many of the systems used to create both sustainable and natural buildings may not follow convention. The building needs to function as a system with all its parts integrated according to their properties and functions.

More about living buildings, sustainable and natural building materials and design soon.~

We are in a transitional time. Sometimes issues are addressed only belatedly as a governing body encounters them. When I took my first solar course, we were told a story. Apparently, when incentive programs for solar PV first began in sunny California, they were paid according to Watts installed. After a time, it was realized that this led to a significant number of installations that didn’t actually produce very much power, with PV even being placed on north-facing walls. The state wasn’t getting very much for it’s investment! The program was later changed so that the incentive was paid according to energy actually produced (Watt-hours). California now also has regulations governing acceptable site assessment tools to ensure solar access (avoiding shading).

Technical Safety BC provides regulatory safety for solar PV installations in BC via the electrical permit system and its licensing of electricians. Permits and licensing are there for several reasons. Safety – to prevent electrocution injuries and fires; damage to equipment and to ensure that your installation is safe for the next home or building owner. If as a customer, you want to add any new equipment, solar or otherwise, expect that some updating of your old system or equipment may be required before you can invest in your additional new equipment. An electrician will make up some part of your installation team, even if your PV supplier is not one. Be prepared and plan for this when planning spending.

What about cheaper solar equipment on line?

The equipment or system looking cheaper online may not contain all the required parts to make it work or meet local code or its parts may not all be compatible and work properly. Please do not think you can order your panels online cheaper than your local installer. Or, rather – you can, but who is going to ensure the whole thing works? You may even find a contractor willing to install the stuff you order – but they are not going to work for free when it doesn’t install as expected, needs parts, needs troubleshooting or doesn’t pass inspection. In the end, this route might not be more affordable.

Please look for a responsible and reputable installer and pay them for the equipment they know and trust. Your installer will (ideally) have taken time and money to learn how to install solar equipment properly. Taking time from work to learn best practice and pay for tuition costs them money. Support the local installer that is doing quality work; invest in your community. Having said that, if you need to look further afield to find an installer that is able to answer all your questions and provide the best service, that can be more affordable than going with one who has not taken the time to learn best practice. You are not looking for the installer that tells you what you want to hear, but the one that tells you the truth.

Should I wait for newer, better PV before I invest?

There’s no need to wait. Tech is always changing and improving, but the essential PV panels and equipment is well established and won’t likely change too much in the very near future.

What about maintenance?

Most maintenance and renovation work in renewable energy systems is prevented altogether with accurate and thoughtful design in the first place. The correct use of solar siting tools during site assessment will avoid current (and hopefully future) shading from vegetation growth or power lines and other objects. The use of established, reputable, quality equipment will reduce (although not necessarily avoid) equipment issues. If you have chosen both a reliable installer and reliable equipment, issues should be resolved fairly rapidly. If they cannot be resolved with the installer, talk to the manufacturer. As a last resort, which unfortunately does happen, you may need to find another installer to remedy your situation. This, unfortunately happens in all industries. The prevention is doing your homework and choosing wisely.

Off-grid, ground mount designs need to plan for snowpack and animal and human access (access is now covered by the BC electrical code). Panel maintenance will include an occasional gentle hosing off of dust or brushing off of snow that will improve production.

Problems with solar can develop. Cracking of lenses, loose electrical connections or loose panels and growth of nearby vegetation causing shading can occur. Modern electronic solar equipment like optimizers, mini-inverters and larger inverters perform system management that was barely conceivable only a few years ago. They are quite amazing and most of the time work extremely well, but failures do happen, even in quality brands; quality means it is less likely and will be easily sorted out when it happens.

Both grid-tied and off-grid owners should be aware of your actual, normal and estimated monthly production and be on alert for any unexplained inconsistencies, which can be investigated. Other than that, a visual inspection done semi-annually of all parts to correct any detected issues (like loose connections or panels) should keep your system in good repair and running trouble-free. For off-grid folks with pole arrays, your semi-annual visual inspection can be when you go out and change your array angle for summer and winter.

Battery types and brands vary in maintenance requirements, so follow your installer’s and manufacturer’s instructions and ensure that your equipment is charging at the expected frequency and getting the expected results and/or have that included in a maintenance contract.

About Mechanical Trackers

Trackers were used for off-grid pole mount installations in the old days before LED lighting and high-wattage PV panels, when life off-grid was pretty limited, electrically-speaking. They allowed the PV array to change its angle to the sun (making it more direct or closer to perpendicular) in one or two planes (single and dual axis) to physically track the sun over the course of the day to maximize production. Today they are often used in grid-tied installations in some jurisdictions as they can be quite cost-effective, if the price being paid by the utility for your production is high enough. Currently, in BC, our main utilities do not pay high prices for small power producers. BC Hydro is currently paying approximately 10 cents per kWhr.

For either off-grid or grid-tied installations, a cost benefit comparison should be made to evaluate if a tracker is a reasonable investment. The production value of the tracker must be compared to the total cost of the tracker: its installation, plus maintenance costs and lost income during its downtimes, which will most definitely happen. Crunch the numbers if you are considering this, but I have yet to see one for a small producer (grid-tied or off-grid) in BC that is justified. In most circumstances, if you want more production and have the space and solar access, it is more economically effective to simply add more panels.

About Racking

Ground Mounts

Now, you know from my website here that I am all about appropriate materials and decreasing cement and metals use. But there are places for these materials and your power production racking is one of them. In most cases, over the lifetime of the installation, using these higher embodied energy structural materials will still cost the environment less than a wood frame racking that has to be replaced one or more times during the equipment’s lifetime.

Wood racking is completely acceptable for small installations but ideally will be made with larger timbers, not small dimensional lumber. Ultimately, even a well-made wood frame will deteriorate before the life of that PV array, so why not just build the frame to match and not risk those conductors to a shifting frame in the future? Install racking that will hold up to the lifetime of the equipment and weather our Canadian climate that includes exposure to snow, wind, rain, sun and repeated freeze-thaw cycles.

Roof Mounts

Reputable installers will have roof racking and installation procedures for preventing water penetration for all roof types. If you are building new, standing seam steel roofs provide a surface for solar clamp attachment that gives excellent structural support and avoids roof penetrations altogether. If you have a shingle roof that is in need of replacement soon you will most likely want to wait until it is replaced to install your PV system but you can check in with your roofer and PV supplier about your plans to help you decide when to proceed.