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Hãy viết đoạn tóm tắt về nội dung bằng tiếng việt kích thích người mua: Tesla Powerwall Review: Well-Rounded Solar Batteries

7.0

Tesla Powerwall 2

Like

• Unlimited cycle warranty
• Well-rounded performance and efficiency
• Compatible with and without solar panels

Don’t like

• Not as modular as other batteries
• Glitchy energy management app
• Bad customer service reputation

Electricity rates are rising, and some states are decreasing how much homeowners with solar panels get compensated for selling their excess energy to the power grid. If you face frequent power outages, fear higher power bills or want to use your excess solar power, you might want to consider a home battery backup. During your solar battery search, you’ll most likely encounter the Tesla Powerwall.

Like:

• Large storage capacity
• Compatible with and without solar panels
• Well-rounded specs 
• Excellent warranty

Don’t like:

Like:

• Large storage capacity
• Integrated solar inverter
• Higher backup (off-grid) power output 
• Excellent warranty

Don’t like:

• Lower on-grid power output (same as Powerwall 2)
• Must be installed with solar panels

Like:

• Large storage capacity
• Very high power output

Don’t like:

• Can’t be installed with Powerwall 2 or Powerwall Plus batteries
• Limited warranty and spec details currently

Capacity and modularity

All three Tesla batteries have a 13.5 kilowatt-hour energy capacity, a decent size for a home battery backup. However, if you have a larger home (or plan on going off-grid), you’ll likely need multiple Powerwalls. One Tesla Powerwall battery is ideal for partial home backup, while whole-home backup will likely require two or more Powerwalls. You can install up to 10 Powerwall 2 units or Powerwall Plus units for a total of 135 kWh of energy storage. Both battery models can be mixed. However, the Powerwall 3 is not compatible with the Powerwall 2 and Powerwall Plus models. 

Tesla Powerwall batteries are not as modular as other batteries on the market, making size upgrades difficult (and expensive). If you find yourself needing a capacity upgrade, you’ll have to buy another 13.5 kWh battery. 

Performance and efficiency

Efficiency-wise, the Powerwall 2 is about average for the batteries we examined. The Powerwall 2’s round-trip efficiency is 90%, meaning 10% of the electricity gets lost on its way to the battery for storage. A round-trip efficiency of 90% (or higher) is standard for lithium-ion batteries. The Powerwall Plus also has a round-trip efficiency of 90%.

The Tesla Powerwall 2’s depth of discharge (how much of the battery you can use at once without damaging it) is the best it can be: 100%. But just because you can drain the majority of your battery all at once doesn’t mean you should. One of the main factors affecting a battery’s lifespan is the number of cycles it goes through. A battery cycle is the process of discharging (emptying) your battery and then recharging it. In other words, the fewer times you fully cycle your battery, the better. The Powerwall Plus also has a 100% depth of discharge rating.

What about power output? It’s fine. One Powerwall 2 can output a peak of 7 kilowatts, with a continuous power output of 5 kW. A battery’s peak power output is the amount of power the battery can put out all at once without damaging anything. Peak power output is typically used when activating large loads or appliances, such as when your AC or heat kicks on. Continuous power output is the amount of power the battery is able to put out at all times. The more Powerwalls you install, the higher the power output. 

The Tesla Powerwall 2 and Powerwall Plus have the same on-grid power output capabilities, but the Powerwall Plus has far better backup power output capabilities, with a peak power output rating of 22 kW in full sun or 10 kW with no sun and a continuous power output rating of 9.6 kW in full sun or 7 kW with no sun. The Tesla Powerwall 2 can also be installed to a system with a backup generator, but it will need to be connected with an external automatic or manual transfer switch.

Read more: Just looking for an emergency backup? Check out portable solar panels and solar generators.  

Customer service

Tesla’s online customer service reputation is not the best, and it seems easier to find bad customer service reviews than good ones. Tesla Solar is not Better Business Bureau accredited, but anecdotal evidence suggests poor customer service and some customers even regretting their purchases. There are frequent complaints about rude customer service or sales representatives, as well as Tesla not following through when it comes to communicating with their customers. 

Warranty 

Tesla’s warranty for the Powerwall 2 and Powerwall Plus batteries stands out among competitors. Here’s what it includes:

• 10 years
• Unlimited cycles
• 70% end-of-warranty capacity guarantee 

A 10-year warranty is the industry standard for solar batteries, but few come with unlimited cycles. The typical battery warranty covers 4,000 to 6,000 cycles, making Tesla’s unlimited-cycle warranty more competitive. The number of times you cycle your battery (drain and recharge it) affects its lifespan, which is why many manufacturers will include a cycle or throughput clause in their warranty. 

The Powerwall’s warranty also comes with a 70% end-of-warranty capacity guarantee. Batteries lose capacity and their ability to hold a charge over time, so some manufacturers will include an end-of-warranty capacity guarantee. This is the manufacturer’s guarantee that your battery will be able to store a specific percentage amount of energy by the time your warranty period is up. Tesla guarantees the Powerwall will retain at least 70% of its original capacity by the time your warranty ends.

Tesla app

Using the Tesla app, you’ll be able to view and monitor your home’s energy usage, as well as analyze and compare data about your home’s past and current energy production. Powerwall can also be customized to help support your energy goals by using the different control mode settings through the app. These settings essentially change how your battery charges and discharges. Keep in mind that some features and settings are only available when paired with solar panels. 

You can also set a designated percentage of your Powerwall’s capacity aside to be reserved for backup power in the event of grid outages. Tesla recommends setting a backup reserve of 20% when using the backup reserve setting, but you can set it to whatever you like. 

The Tesla app is not without its flaws. Online reviews show complaints about frequent glitches and the unreliability of the app, with some people saying it only seems to work half the time they use it.

Tesla Powerwall 2 vs. Tesla Powerwall Plus

There isn’t much of a difference between the Powerwall 2 and Powerwall Plus. The Tesla Powerwall 2 is just a battery, and can be installed with or without solar panels. The Tesla Powerwall Plus is a regular Tesla Powerwall 2 battery that has been integrated with a Tesla Solar Inverter. The Powerwall Plus is designed specifically for solar installations, while the regular Powerwall 2 model is compatible with or without solar panels. 

Both batteries have the same capacity (13.5 kWh). However, the Powerwall Plus has a much higher backup power output rating, making it a better option if you are installing a new system and have plans to go completely or partially off the power grid. Most homes will likely need more than one Tesla battery (of any model) to live completely off-grid. Both Tesla batteries are interchangeable, meaning you can install a mix of up to 10 Powerwall 2 and Powerwall Plus batteries. 

What we know about the Tesla Powerwall 3

Tesla debuted the Powerwall 3 at this year’s RE+, a renewable energy trade show in Las Vegas. During the week of the show, the company updated its website with some details about the Powerwall 3, but hasn’t released a spec sheet yet. Representatives at RE+ also declined to speak with CNET about it. We might not have all the details as of right now, but here’s what we do know.

The Tesla Powerwall 3 has an energy storage capacity of 13.5 kWh, the same as the other Powerwall batteries. The Powerwall 3 is also over twice as powerful as the other Powerwall batteries, with a continuous power output of 11.5 kW. So yeah, it’s kind of a powerhouse. 

Like the Tesla Powerwall Plus, the Powerwall 3 has an integrated solar inverter, meaning it can be DC-coupled for higher efficiency. But it’s not compatible with other solar inverters. The Tesla Powerwall 3 can’t be installed with other Powerwall models either. So if you already have a Tesla Powerwall 2 or Powerwall Plus battery, you won’t be able to add on the Tesla Powerwall 3.  

The Powerwall 3 comes with a 10-year warranty, but we aren’t yet sure if it will have the same unlimited-cycle warranty as the other Powerwall batteries. Tesla’s new battery is set to release to the public sometime in 2024. Pricing information is unknown.

How we evaluated the best solar batteries

Not every battery is right for every home. It’s difficult to pinpoint exactly which solar battery is the “best” battery for your home without doing an on-site inspection. We’re unable to do hands-on testing with solar batteries because of the complexity of solar panel systems, but there are ways to evaluate and compare these batteries. Here’s how we evaluate solar batteries.

First, we created categories that would be used to evaluate the battery’s efficiency, performance, capacity and value. We also weighted each category. The weight of each category reflects the importance we felt was relevant to the average person. Here are the categories we considered and their weights:

• Battery modularity (stackability): 20%
• Warranty: 20%
• Round-trip efficiency: 15%
• Depth of discharge: 10%
• Power output: 10%
• Price: 10%
• Customer reviews: 10%
• Battery capacity: 5%

We looked at more than 15 of the most common batteries on the market and collected the data for each category to compare the numbers. Each category (for every battery) was then given a tier-style rating (from 1 to 5) to see which aspects of each battery were above average (among those on our list), average or below average. 

Frequently asked questions

Can I live off-grid with the Tesla Powerwall battery?

Is the Tesla Powerwall eligible for the federal solar tax credit?

How do I install a Tesla Powerwall?

What is the energy storage capacity of the Tesla Powerwall?

When will the Tesla Powerwall 3 be released?

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