Satellite imagery of our property was used to determine the best way to install solar panels on our house. Daniel from Skyfire ran some analysis based on current electrical rates (this system involves selling all excess electricity to the utility company, so no batteries are involved.) With solar cells on our roof, we would be able to generate 6750 kWh per year. The cost would be almost $18,000. It would pay for itself in 15 years, with a return on investment of about 2.5%. After 25 years, we would have made $13,000. (2.5% return on investment does not seem like a lot, but right now there are 10-year GICs going for just over 2%.)
We asked about the maximum potential of power generation for our property, and for about $25,000 (using our garage roof as well as the house), we could generate more power than we consumed last year. The total estimated potential for us was 11,800 kWh (we consumed about 9900 kWh last year). This would reduce our overall carbon footprint by 40%.
The price tag is not yet economically viable for us. We’re hoping for federal or provincial support for the switch. And we’ll wait to see if prices drop further (there’s been a massive drop in price so far.) The Guardian: Solar panel costs predicted to fall 10% a year
More math: we consumed about 9900 kWh last year. With this year’s project, we’re hoping for about a 20% drop in consumption – to 7920. Panels on the roof would produce about 6750. That leaves us about 15% short. So perhaps the plan could be to wait for a government subsidy and perhaps a price drop, install panels on the roof, continue reducing our energy consumption (nail that 15%), and produce all our own power. Then add panels on the garage roof when we get an electric car.
In the meantime, we researched other options:
We could invest in a solar project. We made a small donation to The Alberta Solar Co-op.
We’re also watching wind power – inventors are working on bladeless silent small turbines. Green Energy Jubilation: Silent Rooftop Turbine
There’s also microbial power to keep an eye on. MudWatt Microbial Fuel Cell Kit
There’s also interest in thermal heating. CBC news: Geothermal Pitched as Next Big Energy Source
We’re watching development of solar windows. We have the perfect candidate – a large, south facing garage window that we’d be happy to replace. PlanetSave: Solar Windows Ready for Production
However, none of these are in our price range yet and many are not yet commercially available.
In the meantime, we looked at solar toys. The best seem to be for off-grid living, more than for city life. We want more. Maureen has a solar calculator she bought in the 1980s that’s still going strong. The only maintenance it’s had in 30 years is the occasional cleaning of the solar strip across the top.
We did buy a new toy – a string of copper wire fairy lights for the garden. That, the solar calculator and a radiometer is the extent of solar at our house right now.
We want more! So much more is possible, like this totally solar Hutterite egg barn. CBC News: Net Zero Egg Barn. For now, we wait for technology, for government programs, and for further price drops. We’re poised to jump when the time is right. Our dream? In the next five years we’d love to have solar panels, a wind turbine on the north west corner of the garage roof, and a big solar garage window. Plus a battery in the garage, and excess power to sell back to the grid.
Next month we’ll focus on odds and bits, catching up on the repairs we still need to complete, news on small tweaks we’re trying, and a look at whether our consumption numbers are dropping yet.