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Category: Battery Backup, Reviews. Table of Contents. Add a header to begin generating the table of contents. In this article, we will now compare the stats and performance ratings of two of the most popular batteries for home solar energy backup power systems: the Tesla Powerwall vs Generac PWRCell. By the time you’re done reading this, you’ll have a better understanding of which battery may fit your needs better.

You may also contact us at any time with your questions. Before we really dive into it, here are two videos both brands have on their YouTube Channels about their product. Feel free to watch that before you read or after as a refresh. While most home battery systems are designed for use with grid-tied solar plus storage systems, they can sometimes be used for off-grid systems.

Find out what solar + storage costs in your area in 2022

Feature & Benefits

  • Both systems capture and store electricity for later use whether the utility power is online or offline.
  • The Powerwall is only designed to be used in grid-tied homes as a backup to allow you to use your solar energy at night or to provide coverage during grid outages.
  • It is not intended to be used in modern off-grid home solar installations.
  • Similar to the Powerwall, the PWRCell energy storage system is designed only for grid-tied use, as it can only store enough energy for a few hours of power.

It is not meant for off-grid use. Warranties can give you peace of mind, especially when you are making a large investment.

Battery Cost - Does The 26% Federal Solar Tax Credit Apply?

Tesla Powerwall warranty offers a 10-year warranty, with a guaranteed end-of-warranty capacity of 70%. Most homes with Powerwalls will charge and discharge them every day, and as time goes on, rechargeable batteries start to lose some of their ability to hold a charge and recharge fully. This is not unique to home batteries; consider how the battery life of a cell phone diminishes over the years and how car batteries eventually need to be replaced.

That’s why Tesla offers their 70% guarantee, which means that at the end of 10 years, your Powerwall is guaranteed to still have 70% or more of the original capacity. Generac PWRCell also offers a 10-year warranty, but they make no guarantees on battery capacity at the end of that time. Rather, they offer a ‘throughput warranty,’ which refers to how much energy in MWh has been cycled through the battery storage system. This warranty option is similar to car warranties, where they offer coverage for 10 years or 100,000 miles, whichever comes first.

In this case, it’s for 10 years or a set amount of energy throughput based on the size of the battery as follows:. PWRCell model 9: 22.6 MWh. PWRCell model 12: 30.2 MWh. PWRCell model 15: 37.8 MWh. PWRCell model 17: 45.3 MWh. This is a slightly less enticing warranty than Tesla’s since you have no guarantee pertaining to your battery’s capacity at the end of 10 years, and in fact, no guarantee that your warranty will even last for 10 years if you reach the throughput amount before 10 years have elapsed.

Load Management

The physical dimensions of the battery can be an important factor that dictates where your battery can be placed within your home. The dimensions of the Powerwall are 45.3 x 29.7 x 6.1 inches and it weighs 276 pounds. It can be mounted on the wall or the floor and is suitable for indoor or outdoor use. The PWRCell system actually has two separate units: the PWRCell inverter and the battery cabinet.

The inverter unit is 24.5 x 19.25 x 8 inches and weighs 62.7 pounds, and the battery cabinet is 22 x 10 x 68 inches and weighs between 280 and 445 pounds depending on the model. Both of these battery systems have easy to install mobile apps that allow you to monitor and control your systems 24/7.

This type of control is beneficial for homeowners or businesses who pay more for electricity depending on the time of day. By being able to control your utility power consumption and reduce energy costs. With it you have the ability to sell your solar power during peak demand times (daytime) and buy your electricity back at a lower cost at night.

The Tesla app allows you to control both Tesla cars and Powerwalls from your devices. It lets you monitor how much energy is stored from your solar energy system, how much your home is using, and how much is being exported to the grid. You can also download your solar production and battery usage data to keep records. The PWRview app from Generac allows you to monitor your energy production and usage as well, and it provides detailed bill tracking and forecasting.

More Battery Capacity

You can also set up daily and monthly goals for your home’s energy consumption. As of the time of this writing, both systems are still available for purchase. You can order the Tesla Powerwall directly from their website, or start by requesting a call to discuss whether it’s a good fit for your system.

Generac offers a free no-obligation solar quote to help you assess which size of PWRCell would be best for your project. Battery systems are pricey, but luckily there are some incentives that you can take advantage of to help offset the cost. Keep in mind that these costs do not include the solar panels themselves, which can run another $9,000-$15,000, depending on the size of the system.

Our team at Sunbridge Solar can assist you in calculating how many units you will need and give you a more exact estimate based on your project scope. If you buy a Powerwall directly from Tesla’s website, the cost for the unit is $6,500 with the supporting hardware running another $1,100, for a total of $7,600.

More Backup Power

However, that does not account for the installation costs, permit fees, and other soft costs. A more realistic total for installing a single Powerwall is between $14,500 and $16,000. If you bump up to two units, the average cost goes up to about $26,000. The Federal Investment Tax Credit can be applied to the purchase of these units, which allows you to deduct 26% of the total cost of installing your solar energy system from your federal tax liability amount. The deductible amount goes down to 22% in 2021 and there will be no deduction in 2022 and beyond, so act quickly if you’d like to take advantage of this program.

If the deductible amount is higher than your federal tax liability for the year, you can rollover the remaining deduction to the following year. Additionally, Oregon residents may be eligible for an Oregon Department of Energy (ODOE) rebate. The rebate will cover between 40-60% of the total cost of installing your solar energy system if you are eligible, with a cap of \$7,500 for solar plus battery backup systems.

The smallest Generac PWRCell model starts at around $10,000, although the system is very scalable and the larger systems will cost significantly more. Again, that is not including the cost of solar panels. For a more exact estimate of what it would cost to back up your solar system, you can contact Generac to request a quote or speak to our team of experts here at Sunbridge Solar.

The Federal ITC and the ODOE battery rebate can also be applied to the PWRCell as well. There are several different types of batteries that can be used in conjunction with solar energy systems for energy storage. The Tesla Powerwall is a rechargeable lithium-ion battery with liquid thermal control. More specifically, it’s a lithium nickel manganese cobalt oxide (NMC) battery, which is known among batteries as having high energy density and being very safe.

A Whole Home Transfer Switch

Up to ten Powerwalls can be linked together to form a massive battery if needed. PWRCell has multiple lithium battery modules in each battery cabinet, depending on the size of the model that you purchase. It is scalable, so you can always add more modules as needed to meet your needs.

This metric looks at the maximum amount of power in kilowatts (kW) that can be output at one time. If you think of power as water running through a pipe, the continuous power amount would be dictated by the diameter of the pipe and how much water could be pushed through it at once. The maximum continuous power rating determines which appliances you can run, since bigger and more robust appliances require more power.

The Powerwall has a maximum power rating of 5 kW. The stats for PWRCell vary based on which model you choose, from 3.4 kW to 6.7 kW. Tesla Powerwall. PWRCell - Small. PWRCell - Large. Usable capacity refers to the maximum amount of energy that can be stored in your battery when it’s fully charged. Using our water pipe analogy again, the usable capacity refers to how much water is available to run through the pipe.

Performance metrics

Power and capacity go hand in hand because greater power will provide more energy faster, therefore burning through the total capacity more quickly than a system with less power.

Capacity dictates how long your appliances can run for. The usable capacity of a Powerwall is 13.5 kWh. Again, this varies based on the model, from 8.6 kWh to 17.1 kWh of usable capacity. Tesla Powerwall. PWRCell - Small. PWRCell - Large. We vote the Tesla Powerwall as the winner, with Generac PWRCell as a close second. Both of these battery systems are powerful, scalable, capable of charging electric vehicles, and easy to monitor in real-time.

They both come with solid warranties and are in similar price brackets. We chose the Powerwall because it is more of a complete and robust package backed by a trusted brand. However, it really comes down to personal preference, the size of your solar energy system, and any future plans for scaling up your system as to which battery is the best for your needs. By submitting you agree to our terms and privacy policy.

Generac PWRcell warranty coverage

Generac PWRcell warranties

  • Click below to learn more.
  • What is the Generac PWRcell? The PWRcell is a battery storage system that harnesses power from the sun or the electric grid to help you reduce costs, your reliance on the electric grid, and be prepared for unexpected power outages.

Every PWRcell battery storage system consists of one PWRcell inverter, a battery storage cabinet, and lithium ion battery modules. How does a home battery storage system work? PWRcell stores energy from either solar panels or the grid in lithium ion battery modules. The inverter converts the stored energy from direct current (DC) energy into alternating current (AC) energy which can be used to power your home during peak demand times or utility power outages.

How can a battery storage system help me save money? During peak demand times, when utility prices are at their highest, the stored energy can be deployed to power your home, helping you reduce costs. Also, a battery storage system can be self-sustaining since solar panels don’t rely on power from the grid to continue converting sunlight into electricity.

PWRcell modelThroughput warranty
M322.6 MWh
M430.2 MWh
M537.8 MWh
M645.3 MWh

The Generac PWRcell provides the opportunity to go off the grid, completely eliminating your electric bill. How can a battery storage system protect my home from power outages? During a utility power outage, the energy stored in PWRcell can be deployed to provide backup power. Your family and home stay safe and comfortable, providing you with the peace of mind you deserve.

How much power can PWRcell provide? Generac is proud to offer the largest energy storage capacity when compared to competitive products on the market today.

Can you go off-grid with the Generac PWRcell?

One PWRcell battery storage cabinet, consisting of six battery modules, offers 17.1kWh of energy storage capacity. Combine up to two PWRcell battery storage cabinets, with a total of 12 battery modules, for up to 34.2kWh of energy storage capacity. How do I know what size system is right for me? Generac’s PWRcell offers a modular design for easy customization that meets most customers’ electricity needs. Given the number of configurations available, Generac recommends that you work with an authorized Generac installer to determine the right size for your home.

Frequently asked questions about Generac’s battery

Is the installation process difficult? Most PWRcell units can be installed in just a day. Generac recommends that all PWRcell battery storage systems are installed by an authorized Generac installer to ensure that the system is installed to your municipal code and is operating as intended.

Where can a PWRcell be installed?

Like the Tesla Powerwall, the Generac PWRcell is properly set up to be installed inside or outside.

Can you power an electric vehicle with a PWRcell?

The largest PWRcell model is 18 kWh, which is much smaller than the batteries in most long-range electric cars. As such, you likely won’t be able to recharge much of your electric car with a Generac PWRcell.

Can a PWRcell back up your whole house?

In short, yes, but not for long. If you want to back up your whole house for an extended period of time, you’ll need a much larger battery bank. Plus, you’ll definitely want to pair your storage system with solar panels. A single PWRcell battery might keep your appliances going for a few hours or so, but don’t expect to stay powered through a long outage with just a single PWRcell battery (even the biggest one available). Check out our article about how many solar batteries you need to see the math.

Where to buy the Generac PWRcell

Where is the PWRcell installed in my home? The inverter and battery storage cabinet are typically installed inside of an attached or detached garage. If there is no garage on the property, the authorized installer will help to identify another location within the home to accommodate the installation. How much does PWRcell cost? The PWRcell battery storage system starts at just $9,999 MSRP+.

This price point includes 1- Inverter, 1- Battery Storage Cabinet, and 3 – battery modules. Special financing, as well as state or federal rebates, tax credits, and other financial incentives are available, and make the PWRcell even more affordable. Does the Generac PWRcell include solar panels? While Generac does not manufacture or distribute solar panels, our authorized partners can sell and install them – making your entire solution turnkey.

Find out what solar + storage costs in your area in 2022
Generac PWRcell. Generac PWRcell battery storage systems capture and store electricity from solar panels or the electric grid. The stored energy can be used off-grid during outages, during night time, or during peak demand times when the cost of utility power is at its highest, saving money on electric bills.