Powering a Home with Batteries

July 02, 2020

By: Lee LeFever

I write books and run a company called Common Craft. I recently moved from Seattle to a rural island. Here, I write about online business, book publishing, modern home construction, and occasionally, dumb jokes.

We live on Orcas Island in Washington State, which is serviced by ferries and has about 3,000 year round residents. For most of the time it’s been developed, the power infrastructure has been fragile. It’s a densely wooded place and trees often fall on overhead power lines during winter storms. Our neighbors tell stories about power going out over a dozen times in the winter and sometimes staying off for a week or two. For this reason, many houses have built-in generators that run on propane. As soon as the power goes out, the generator kicks on and powers essential things like the refrigerators, water pumps, and lights.

When we started planning our house on Orcas Island, people often asked about our plans for a generator assuming we’d need one. For a while, we had the same assumption. Before starting the construction project, we lived on the island for about 18 months and saw that power outages were becoming more rare. Power lines were moving underground and the power company (a co-op) was fixing problems quickly. The power still went out a few times a year, but for hours and not days.

We also started looking into alternatives to propane generators. Along with using fossil fuel, they are expensive and painful to maintain. We wanted to build a house with smarter, more sustainable options that had the potential to save us money over the long term.

From the beginning of the project, we planned to use solar panels on our roof. Right now, we’re working with an electrician to be sure the house has the proper “rough-in” for making solar installation easy when we can afford it. One of the traditional problems of solar energy is storage. For many years, the energy from solar panels was either used at the moment or sold back to the grid. There wasn’t a good way to store the energy produced during the day and use it once the sun goes down, or during power outages.

In these discussions with the electricians, we took a closer look at batteries designed to store energy that can be used by the home. Like the solar panels, we wanted to be sure the house is being built with the right connections in place for the future. Once the drywall goes up, these things become more difficult.

Tesla, the same company that creates vehicles, created a product called the Powerwall that earned a lot of attention because it made home-based energy storage an option. Today, multiple companies offer similar products. They’re essentially a battery pack that is connected to your house, the grid, the internet, and often, solar panels. The batteries remain at least 80% full and when your house loses power from the grid, batteries keep appliances running instead of a generator. The batteries are expandable, but don’t necessarily power a full house or offer more than a day of energy in a blackout.

Learning about these products changed how we thought about backups for our house. Instead of a generator, we plan to have a battery in our garage that is programmed to bridge us through short-term power outages. Once we install solar panels, the goal is to keep it charged with sunlight. This way, sun during the day can charge batteries that work overnight or during outages.

The battery storage companies we’ve looked at so far are:

If you have any experience with these products, I’d love to talk to you.

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