Tesla Powerwall Maine | Solar Panels Maine | Maine Solar



Tesla Certified Installer

Whether you experience frequent grid outages or are looking for greater energy independence, Tesla Powerwall can be a great solution to accomplish your energy goals. As your local Maine-based Certified Tesla Powerwall Installer, we can help find a solution that’s right for you.

Why Would I Want Grid-Tied Solar + Tesla Powerwall?

Grid-tied solar electric systems do not require batteries to work. Thanks to the net metering policy, you can get the full value of all of the electricity your system produces without relying on batteries. However, it is important to understand that a grid-tied solar electric system will not provide backup power during a power outage. If you would like to leverage your investment in a solar electric system to have a rechargeable backup source of power during a power outage, you need to add a battery backup system like the Tesla Powerwall

What Is The Tesla Powerwall?

Tesla Powerwall

The Tesla Powerwall is a 13.5 kWh rechargeable lithium-ion battery primarily intended for home storage and is commonly paired with solar panels. Like any other battery storage option, a Tesla Powerwall captures and holds the energy to provide backup power in the event of a power outage and can help you achieve a more independent energy lifestyle as well as peace of mind.

What Are The Benefits Of The Tesla Powerwall?

What makes the Telsa Powerwall different from other battery storage options currently on the market is its capacity to support larger loads. That means you have the freedom to power up more of what you need. It is designed for self-consumption, Time-of-Use control, and short-term backup power. The Telsa Powerwall has a user-friendly customer interface and has an excellent dollar per kWh value. 

Tesla Powerwall Instillation

Solar Day and Night

Most homes use a fraction of the solar energy they produce. Instead of sending it back to the grid, Powerwall stores it for later use.

Backup your home

Powerwall acts as a backup system during a power outage, keeping your lights, Wi-Fi, and refrigerator running.

Energy Independence

You will not even notice when the backup mode is on as Powerwall will seamlessly switch to this mode for you.

How Does A Tesla Powerwall Battery Work?

The Tesla Powerwall connects to the electrical system in your home and has a stored energy bank that can power your loads. On its own, a Powerwall will automatically keep your home powered when the power goes out  When combined with a solar array, the Powerwall can be recharged during an extended power outage.  It can also be used to “Self-Consume” more energy, storing power from your solar array during the day and then using battery power at night without drawing any energy from the utility.  

What Can You Power With A Tesla Powerwall?

A single Powerwall can provide up to 5 kW of continuous backup power. You can back up any number of appliances so long as their combined power usage does not exceed 5 kW per Powerwall battery. A single Powerwall can provide up to 13.5 kWh of stored backup energy. On average, getting your critical loads down to an oil, propane, or wood heat source, lights, fridge, freezer, well pump, internet, and device charging should be about 5 kWh per day. A larger home or more occupants may require more energy.  Larger appliances may require more power.  Either reason would require additional Powerwall batteries. When designing your energy storage system, it is essential we find a balance between the total capacity of the Powerwall(s) with the demand for everything you need to power up.

How Long Does A Tesla Powerwall Battery Last On One Charge?

It depends on your home’s energy use and how you manage your loads during a power outage.  A Powerwall should be able to supply about two days of lighting, refrigeration, communication, and basic home needs.

If it is sunny when you lose power, the sun will recharge your Powerwall. But we cannot make any promises this will occur. Most outages in Maine occur during the wintertime, which means if it’s a snowstorm, your solar panels might not be producing energy to keep your Powerwall charged. Energy conservation during battery backup is essential for the best performance of any system.

Can You Set Tesla Powerwall Charging Priorities?

There are various consumption modes that set priorities for charging and consuming that you can program your Powerwall to from the app.

Tesla Powerwall Mobile Control

Backup Only

All the energy in your Powerwall is saved for those rainy days when you need emergency backup power.


Power your home with energy stored in your solar system after the sun sets.  You can set a “reserve” of power left in the battery at all times, in case the power goes out unexpectedly.


Power your home or charge the Powerwall based on a set schedule. 

Where Does A Tesla Powerwall Get installed?

Tesla Powerwall Controller

At 45.3 inches tall, 29.6 inches wide, and 5.75 inches deep, the Tesla Powerwall’s compact profile combined with floor and wall mount options means you don’t have to sacrifice a ton of space for battery storage.

Powerwall is built to withstand a wide range of temperatures (-4°F to 122°F), humidity, rain, and sun. Though they can be installed indoors or outdoors, extreme temperatures make them operate less efficiently. To protect the battery from the elements, Telsa Powerwalls in Maine are installed indoors due to our hot summers and cold and snowy winters. Powerwall must be installed in non-living spaces – like a garage, basement, or mechanical room. Your solar consultant can talk you through the details and options on where to place your Powerwall.

Can I Install A Tesla Powerwall If I Already Have Solar?

Tesla Solar Panel Install
Tesla Solar Panel Installation by Maine Solar Solutions

Yes, in most circumstances, you can. A Powerwall can retrofit most existing home solar systems. In this case, a homeowner will usually have a few different brands that make up their solar electric system. Your current inverter and layout will determine the size and design of a battery for existing equipment. Powerwall is compatible with solar inverters from SMA, SolarEdge, Fronius, Enphase micro inverter, Delta and ABB. Powerwall can be installed with almost all solar panel brands. However, Powerwall cannot currently work with existing battery backup systems. Contact us, and we will be able to tell you if your current solar configuration supports adding a Powerwall. 

Can I Install A Powerwall If I Don’t Have Solar?

Though a Tesla Powerwall installed without solar can charge from the grid, there is not as much benefit of having battery storage if it’s not connected to a solar electric system in Maine. Unlike areas with high variation in on-peak and off-peak rates (think California), it isn’t as financially rewarding here. 

Without solar, the Powerwall has no way to recharge during an extended outage.  So a Powerwall may help with short, temporary power outages, but once the battery is depleted, you must wait until utility power is restored. A Powerwall cannot be configured to charge from a generator source.

The best solution is to include a battery backup with a solar electric system. This does add a cost to the system’s price, but batteries connected to a solar system are currently eligible for the Federal Solar Investment Tax Credit. If a battery is charged by the grid and not a renewable energy source like your solar panels, the tax credit does not apply. 

Who Can Install Tesla Powerwalls? 

A company must be a Certified Tesla Powerwall Installer to purchase and install Powerwalls. To become a Certified Installer, companies must adhere to strict quality, permitting, and inspection requirements. Maine Solar Solutions was one of the first Tesla Powerwall Certified Installers in Maine, and we are thrilled to be the first *Tesla Solar Panel installer in the state providing another panel option for our customers.

Customers with new Tesla Powerwalls

What Type Of Warranties Does A Tesla Powerwall Have?

The Tesla Powerwall comes with a 10-year warranty (unlimited cycles) and ensures the battery will keep at least 70% of its rated storage capacity (equivalent to 9.45 kWh).

How Often Does My Tesla Powerwall Need To Be Serviced?

Powerwall does not require regular maintenance or servicing. However, for your Powerwall to receive software updates and communicate with the Tesla mobile app for energy monitoring, and be alerted to power outages, you need a reliable internet or cellular connection. A Powerwall can continue to operate with its most recent settings, but it’s recommended not to be installed in a location without Internet or cellular service.

Will Tesla Be Launching A Powerwall 3? Should I Wait?

From what we know now, there are no plans to launch a new Powerwall anytime soon. However, batteries themselves are in the early adoption phase, and it’s okay to wait. That is one of the major reasons we future-proof our systems so you can install batteries later. 

Are There Tesla Powerwall Alternatives?

Our team continuously evaluates the best technology to offer the most reliable and cost-effective energy storage solutions. We tailor each solar battery solution for your home or business’s energy storage needs and offer a variety of batteries, including the traditional lead-acid batteries and lithium-ion. The most popular option among our grid-tied solar customers is the lithium-ion-based system Tesla Powerwall, but we also install Solaredge StorEdge, and Sol-Ark systems. Maine Solar Solutions is also the preferred installer for the Ford Lightning Vehicle-To-Home systems in Maine. Our solar consultants will discuss your options during your consultation.

Installing With Maine Solar Solutions 

Maine Solar Solutions’ solar consultants and electricians can help you find the right Tesla Powerwall solution or another battery backup solution for your home. We take care of everything from designing the system specifications, permitting, installation, financing options, and customer support.

Helpful Information For Your Solar + Battery Backup Journey

We understand that going solar is a big decision for any homeowner. Our goal is to empower you with the information you need to make an informed decision about solar electric solutions for your home – with no pressure. To help guide you on your solar journey, we listed some helpful links below to get you started. As you review, please do not hesitate to reach out to our team directly if more questions arise.

491 US Route 1 Suite 20
Freeport, Maine 04032

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