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6.2

SunPower SunVault

Like

• Large capacity sizes
• Unlimited cycle warranty
• Battery and solar panels from a reputable solar company

Don’t like

• Less efficient than other batteries
• Limited modularity
• More expensive

You’re probably not shopping for just a solar battery. You’re likely shopping for an entire solar panel system. And if you are, you might be considering SunPower, which is one of the top solar companies out there and offers the most efficient solar panels on the market. That means you might be getting SunPower’s solar battery, the SunVault. 

System components

Most of the SunVault’s components are consolidated into one or two boxes, meaning you won’t need to have several boxes on the wall. Here’s what you can expect to be installed with a SunPower SunVault: 

• Hub+
• Inverter
• Battery (ESS)

The battery itself comes in the form of 6.5 kWh battery modules that are stored within a larger cabinet-like enclosure, referred to as the ESS. The battery enclosure also contains the inverter, which converts DC electricity generated by your solar panels into AC electricity that you can use to power your home. Inverters are essential. Without an inverter, you wouldn’t be able to use solar to power your home. Next to your battery enclosure is the Hub+, which contains a few monitoring and control components, with the main one being the system’s grid-interconnection device. This device functions as a transfer switch. It detects when the power grid is down and switches the system into backup mode. 

Capacity and modularity 

The SunVault offers large capacity sizes but doesn’t leave wiggle room for any smaller sizes in between. This makes capacity upgrades and finding a capacity size that’s “just right” for your home a bit more difficult. The SunPower SunVault can be installed as either a single unit or a double unit. Each unit contains a specific amount of battery modules.

Warranty

The SunVault is backed by a great warranty. 

• Years covered: 10 years
• Cycles covered: Unlimited cycles
• End-of-warranty capacity guarantee: 70%

It’s covered for 10 years, which is the industry standard. But it also comes with an unlimited-cycle warranty. Most manufacturers set a limit on how many times you can cycle (drain and recharge) your battery before the warranty ends. The SunVault’s unlimited-cycle warranty means there’s no limit to how often you use your battery. The SunVault and the Tesla Powerwall are the only solar batteries we’ve seen with unlimited cycle coverage. SunPower also guarantees your SunVault battery will retain at least 70% of its original energy storage capacity when your warranty period ends.

Customer support

With most battery manufacturers we review, customer support seems to be hit or miss. SunPower’s customer support is a hit, with high reviews from customers on SunPower’s Better Business Bureau page. Many customers that left positive reviews report experiencing helpful customer service during app troubleshooting and throughout the solar installation process.   

However, many recent customer reviews are negative. Customer complaints center around long wait times for installations and repairs, as well as having performance issues with their solar panel system after a few years. 

mySunPower app

With the SunPower SunVault, you’ll also gain access to SunPower’s energy monitoring app, mySunPower. With the app, you’ll be able to monitor your battery’s charge, designate energy to run specific loads, monitor solar production, and review time-series data on the performance of individual solar panels and the system as a whole. You’ll also be alerted when your solar panels are producing energy at their best. 

The mySunPower app offers several different power mode features as well. Cost Savings mode helps users avoid expensive time of use rates by limiting grid usage and using battery power instead. 

“One of the unique features with cost saving mode is that the app will recognize when there’s a high or low time of use rate and then adjust to what is most efficient for the customers so they can save the most money,” said Kinney. “So by using this load offset, the battery charges and discharges in a manner that’s most efficient for the customer, utilizing energy when it’s not as expensive and storing energy when it’s more expensive.”

Self-supply mode prioritizes pushing all your excess generated electricity into the battery instead of sending it to the power grid. Reserve mode allows you to reserve a certain percentage of your battery’s stored energy to be used exclusively during the event of an outage. The mySunPower app is highly rated on app stores, with the majority of users having a positive experience with the app’s functionality.

How much does the SunPower SunVault cost?

The SunVault is a bit pricer than other solar batteries we’ve looked at. A single SunVault unit costs between $16,000 to $20,000, and a double SunVault unit starts at $26,000. These price estimates also include the cost of installation, according to SunPower. The company’s battery capacity offerings are on the larger side, so the expense is to be somewhat expected. The larger your battery capacity, the more you’ll likely pay. As a general rule of thumb, you can usually expect to pay between $1,000 to $2,000 per kilowatt-hour of energy storage. And the installation fees will generally cost around $3,000 or more. 

Other factors affecting battery pricing are location, the installer and how many solar panels your home has. Speak with an installer in your area to get the most accurate price. 

Is the SunPower SunVault my best choice?

The SunVault might be your best battery option, or it might not be. It’s hard to determine which battery is the “best” choice for your home without doing an on-site consultation and an energy audit. Your personal energy goals also play a role in which battery you should choose. Do you want partial or whole-home backup? Do you just want protection against short power outages, or are you looking to lessen your reliance on the power grid for the long-term?

SunVault isn’t the most efficient or modular solar battery. And it’s quite pricey. But it does offer larger storage capacity, decent power output, a great warranty and is backed by a solar company with a proven track record in the industry. While the SunVault is a decent battery option, don’t limit yourself to just the SunVault. There’s a wide variety of solar battery options available. And manufacturers continue to release new batteries every year. Installers will typically carry multiple battery options too. Contact solar installers you’re interested in and see which batteries they carry.