Tesla Powerwall installed for customer's home in Maine

Tesla Powerwall installed for customer’s home in Maine

The next generation of battery storage has arrived, giving solar customers clean, reliable, and efficient backup power that also lessens their daily dependence on the power grid.

Grid-tied solar electric systems are a great way to save money using free power from the sun. However, most grid-tied solar arrays are designed to shut down when they lose grid connection. When you pair solar electricity with battery storage, you can supply critical loads in your home, or even function as a grid independent “energy island.”

ReVision Energy is a Tesla Powerwall Certified Installer, which means we offer a customized solar-plus-battery solution that enables you to access the free, abundant power of the sun at your home and reduces your reliance on fossil fuels. We have Tesla Powerwall available now across our geographic region of MaineNew Hampshire, Massachusetts, and parts of Vermont.

How Battery Backup + Solar Power Works

Battery or Generator – Which is better when the power goes out?

Home standby generators tend to be the norm in New England for backup power in utility outages, but with ease of operation, and the ability to be recharged by solar, a battery pack is an increasingly attractive option:

Advanced battery energy storage system Fossil Fuel-Powered Home Standby Generator
Maximum peak power (kW) 4.5 – 21 kW  7-10 kW
Energy Storage 10.6 – 40.5 kWhr  Depends on tank size
Duration Forever, if solar is available  Until the fuel runs out
Backup the whole house Possible but usually we design critical loads only for longer run-times  Yes
Backup critical loads forever Yes – just add sun!  No, limited by fuel tank
Noise Quiet – (as loud as refrigerator)  Loud – (as loud as a city street)
Service required None Annual service: oil change and filters
Warranty 10 years  0-2 years
Internet-enabled Yes, included in cost  No
Future smart home ready Yes  No
Future smart grid ready Yes  No
Provides protection against solar regulatory changes Yes¹  No
Requires weekly ‘exercise’ to be available No  Yes
Net Installed Cost $10,000 – $25,000+² $7,000
Plus gas install N/A  $500
Annual service cost (est) None  $200
Annual fuel cost (est) None  $300³
Expected system life 15  12
Total cost for 10 years $10,000 – $25,000+² $18,250

¹ Installing energy storage provides some mitigation of risk associated with future Net Metering uncertainty and other rate design risk by allowing a customer to maximize self-consumption, minimize demand charges or optimize energy use patterns for a possible Time of Use rate.
² Net Cost: Assumes storage is charged by a solar energy system and so is eligible for the 26% federal tax credit. Multiple units will be required for extended runtime or higher capabilities so price range will vary accordingly. Not shown here are state incentives which exist in some areas.
³ Assumes 100 G a year at $3/G propane

While there are some limits to its power output capabilities, the battery pack is infinitely cleaner, can run indefinitely under proper design circumstances, has no recurring maintenance needs, and offers a range of capabilities—such as “self-consumption” of solar power and grid support services—not offered by generators. As technological evolution and fierce competition push down the sticker price of battery backup units, we expect the next 3-5 years will show a seismic acceleration in the adoption of residential battery systems.

What Customers Say

With the Powerwall you can store solar energy generated during the day for use at any time. During the day, the sun shines on your solar panels, charging your battery. At night, your home draws electricity from your battery, powering your home with clean, sustainable energy 24/7.

Installing a Powerwall with ReVision Energy is easy. We take care of everything from system design to permitting, installation, financing, and ongoing customer service.

Powerwall consists of a 14 kWh lithium-ion battery pack, liquid thermal control system, an integrated inverter and software that intelligently dispatches electricity when it’s needed most. The unit mounts seamlessly on a wall or on the ground, indoors or outdoors, and is connected to the grid to export excess energy, maximizing your opportunity for economic benefit.

Kristen and Josh of Rochester, NH had a Powerwall installed and wrote us to say:

Going solar had been a dream for us since we bought our house 10 years ago, but we really wanted to store our energy, too. With the Tesla battery, and our panels, we were able to make that dream a reality! We love that we are able to teach our daughter about alternative energy while providing a cleaner, greener future for her!”

We also spoke with Kate Olson and Matt Cheney who paired a Powerwall with their solar array at their 1870 farmhouse in Freeport, Maine:

“We live in a relatively rural area where there are power outages. A lot of people get generators for backup, but we’ve never wanted to do that.

Unlike a generator, the Powerwall is completely silent and powers on in a fraction of a second during a grid outage.

For us, we’re excited about capturing energy and creating electricity in general but then there is something nice about feeling like you’re actually using the solar energy you are producing rather than throwing it out to the grid.”

Learn more: https://www.tesla.com/powerwall or Download the Tesla Powerwall Brochure (PDF)

Future-Proof Solar Investments

An image of solar panelsReVision Energy has been following the developments in home battery backup technologies for years. In the early days, the only kind of solar energy systems were off-grid (battery-only) systems, and then with the advent of grid-tied inverters, the obvious benefits of tying up to the grid became clear.

Now, technology has come full-circle, and a grid-tied solar customer can enjoy the benefits of being tied to the grid, with the resilience and independence of having battery support.

Customers who want to maximize the financial savings of their solar investment can start with a straight grid-tied array for maximum savings and lowest upfront cost, then invest later in a home battery backup solution when they are ready. While there is great battery technology on the market already, we expect that this segment of solar technology will rapidly improve over the next 5-10 years.

Learn More About Home Battery Backup & Energy Storage

ReVision Energy strives to stay at the top of all trends in renewable energy, and solar backup power is one of the hottest topics right now. Our engineers worked with our editorial team extensively for an in-depth, three-part series on the state of battery backup storage and its implications for the homeowner, and the grid, writ large. Though originally published in 2016, the history of the development of battery capabilities and analysis of the core technology of modern battery storage remains fresh:

Part 1:

Solar + Batteries: Is Tesla’s PowerWall the iPhone of Battery Storage?

Part 2:

Solar + Batteries: The Right Thing to Power my Home?

Part 3:

Solar + Batteries: Technologies on the Bleeding Edge

Battery Backup Photo Gallery