Melhores baterias solares de setembro de 2024 –

We’ve evaluated many solar batteries and the Bluetti EP900 Home Battery Backup is CNET’s pick for the best solar battery overall, overtaking the Tesla Powerwall. The EP900 system earned high marks for its power, warranty, modular design and price transparency. It’s important to note that we scored our batteries based on a backup power use case. Batteries aren’t a one-size-fits-all product. The EP900 system is a solid option for your home, but it might not be your “best” option. Another battery might suit your home and individual energy needs better. If you’ve got rooftop solar panels, they might produce more energy than you can use. Your utility might pay you for that energy via net metering, but you can also use it to charge a battery to use later. Once you’ve got a battery full of clean electricity, you can use it to avoid peak charges under time-of-use rates, decrease your reliance on your utility, use solar energy at night or have a reliable source of energy during a blackout. I’ve spent countless hours digging through battery specification sheets and spoken with industry experts to get a better understanding of how these batteries work and what really matters for homeowners who are shopping for a home battery. This evaluation methodology assumes you’re using the battery primarily for home backup purposes. If you’re looking to use your battery for time-of-use offset or virtual power plants, then the “best” battery options we have listed might not be right for your situation. Home batteries are a major household purchase and should be treated as such. It’s important to compare all your options, even ones not featured in this list. Can solar panels save you money? Interested in understanding the impact solar can have on your home? Enter some basic information below, and we’ll instantly provide a free estimate of your energy savings.

• The Bluetti EP900 Home Battery Backup is CNET’s pick for the best solar battery overall
• The EP900 system earned high marks for its power, warranty, modular design, and price transparency
• Batteries aren’t a one-size-fits-all product, it’s important to compare all your options

The EP900 Home Battery’s powerful and modular design gives it a boost over the competition. The system offers three capacity options and an impressive 9 kW of output at any size. The price is available on Bluetti’s website, so there’s no guessing involved. But it’s not the most efficient. The EP900 system is an inverter stacked on top of Bluetti’s B500 battery units. Capacity depends on how many B500 units you install, about 9 kWh with two units, up to 39.6kWh if you install an additional system. The EP900’s power output shines, 9kW at any capacity size, or 18 kW with two systems. It’s backed by a 10-year warranty with an 80% end-of-warranty capacity guarantee. We found this battery to be slightly cheaper than similar options, and pricing information is clearly displayed on Bluetti’s website. It has lower depth of discharge (90%) and round-trip efficiency ratings (85%) than peers.

The Tesla Powerwall 3 is a big improvement from the Powerwall 2. The Powerwall 3 keeps the same 13.5 kWh capacity and warranty as Powerwall 2 but nearly doubles its power output (11.5 kW). The Powerwall still falls short in modularity, price transparency, and customer support. It’s only available in one size. One Powerwall holds 13.5kWh, which is great to get you started. But if you need more capacity, you’ll have to buy another Powerwall. Tesla says the Powerwall 3 warranty is the same as the Powerwall 2. If that’s the case, the Powerwall 3 should have an unlimited cycle warranty. The power output of the Powerwall 3 is a significant improvement from previous models, with a continuous power output of 11.5 kW. Its round-trip efficiency is 89%, which is pretty standard. Tesla’s customer support options and customer service reputation leave more to be desired.

The IQ Battery 5P is a big step up from Enphase’s previous models. It’s a small 5 kWh battery that packs a lot of power. Enphase also offers some of the most robust customer support options we’ve seen. But the battery falls a bit short in price transparency and modularity. The Enphase IQ Battery 5P is a 5 kWh battery that offers a lot of power. Its peak power is 7.68 kW, and you’ll get 3.84 kW of continuous power per battery. The IQ Battery 5P has solid round-trip efficiency (90%) and depth of discharge (98%) ratings. Enphase also offers a plethora of customer support options, including live chat and 24/7 availability. The battery comes with a 15-year warranty. The battery itself isn’t a modular design either. This means you’ll have to buy separate batteries in multiples of 5 kWhs to get the capacity you want.

If it’s modularity you’re after, the Generac Pwrcell is a worthy choice. The Pwrcell has a battery cabinet that contains small battery modules. The system’s round-trip efficiency is high as well. Generac also offers plenty of options for customer support. But the Pwrcell’s depth of discharge, warranty, and price transparency could be better. The Pwrcell battery is sold as a cabinet containing individual battery modules that can incrementally increase your battery capacity. One battery cabinet holds between 9 and 18 kWh. Capacity is expandable in increments of 3 kWh, making upgrades easy. You can install up to two cabinets for a total of 36 kWh. The Pwrcell offers high round-trip efficiency (96.5%) but falls short on depth of discharge (84%). Generac also offers plenty of options to reach out for customer support, including 24-hour availability. The Pwrcell’s warranty is a bit lackluster, but not horrible. There’s no price listed publicly either, so you’ll have to rely on estimates from installers.

The SolarEdge Home Battery is very well-rounded in its performance. But where it stands out is its unlimited cycle warranty and high round-trip efficiency. It falls a bit behind in modularity, price transparency, and customer support options. The SolarEdge Home Battery has 9.7 kWh of usable capacity and is a very well-rounded battery overall. What puts it above other batteries is its unlimited cycle warranty and high round-trip efficiency (94.5%). It also has a 100% depth of discharge. The power output of the SolarEdge Home Battery is standard, which is fine. It has a peak output of 7.5 kW and a continuous output of 5 kW. The battery isn’t modular, so if you need a capacity upgrade, you’ll have to buy another 9.7 kWh battery. We also didn’t see many options for customer support or information about price. A solar battery’s main function is to store excess electricity generated by your solar panels. If you have a solar battery installed, extra electricity from your solar panels goes into storage so you can use that energy later. This stored energy can be used to power your home during periods of inefficient electricity generation, like at night or during cloudy weather. Batteries also provide other benefits that you don’t even need solar panels for. You can store energy in your battery to use during power outages, or use it to help offset expensive electricity rates. Just like solar panels, solar batteries come with their pros and cons. A solar battery can help you lower your electricity costs, provide protection against power outages and lessen your reliance on the power grid. They’re also very expensive, sometimes costing as much as solar panels themselves. Depending on your solar system size and what areas of your home you’re looking to back up, you might need more than one battery. Pros: Cons: Your budget is likely the biggest factor at play when choosing a battery, but there’s much more to look for in a battery beyond its price tag. You’ll want a battery that can match your household’s energy usage and has enough output to support the electrical loads in your home that you want to back up during an outage. Keep in mind what you exactly plan to use your battery for. Some batteries are better for backup purposes, and others are better for electricity offset and virtual power plant participation. You should consider modular batteries. These battery designs make it easier to upgrade your energy storage capacity later on, and they tend to be easier to install. Since solar batteries are expensive, you should also compare battery warranties. A lithium-ion-based solar battery’s lifespan is typically anywhere from 10 to 15 years. Most manufacturers offer a 10-year warranty with their batteries, but there are some outliers. Choosing a battery isn’t easy, and it’s not a decision that should be made on impulse. Take your time evaluating all your options. Local installers are going to be your best source of information on what kind of battery is best for your household’s energy needs and goals. They’ll also be able to provide you with quotes on how much things are going to cost. When your installer goes to wire everything up, your battery will be either AC-coupled or DC-coupled. The big difference between the two is the path the electricity travels between your solar panels, battery, and home, as well as the number of times that electricity is converted. DC means direct current, in which electricity flows only one way. AC is an alternating current, in which the current is capable of changing direction. The important thing to note is that your solar panels generate DC electricity, but your house (and the power grid) runs on AC electricity. Then there’s your battery, which can only store DC electricity. This is where a key piece of equipment known as an inverter comes into play. The inverter acts as a sort of translator between your solar equipment and your house, converting the DC electricity from your panels and battery into AC electricity that your home can use. In an AC-coupled system, electricity from your battery will need to be converted three times before it reaches your home. Your solar panels generate DC electricity and then are sent to your main solar inverter where the DC electricity is converted into AC electricity. From there, this AC electricity can either go straight to power your home or be sent to the battery for storage. If it goes to the battery, that AC electricity will need to be converted back to DC first. This is where a separate inverter for the battery becomes necessary. The AC electricity is converted to DC via the battery inverter and is then stored in the battery. When you’re ready to pull energy from the battery to send to your home, it goes through the battery inverter once last time (from DC to AC). Needless to say, this is a pretty inefficient process. An AC-coupled system. In a DC-coupled system, things are much more straightforward. There’s less equipment involved, and you’ll only need to convert electricity once. The DC electricity generated from your solar panels will either go into the battery with no conversion necessary, or it goes to the main solar inverter to be converted to AC electricity. Once that conversion happens, the AC electricity is sent to power your home. A DC-coupled system. Solar batteries aren’t just good for providing backup power. A battery can help you save money on your electricity bill, especially if your utility charges time-of-use rates. The best part is you don’t even need solar panels for this to work. Some utilities charge more money for electricity use during hours of the day when the demand for electricity is high, like mornings and evenings. Rates during these specific hours can sometimes be double the normal electricity rate or higher. A battery can help you avoid these high time-of-use rates by using the stored energy from your battery to power your home during these peak hours. Your solar panels can help recharge the battery. During hours of normal electricity rates, you can charge up your battery using power from the grid as well. A battery’s capacity is the amount of energy it can store expressed as a unit of power over time, referred to as kilowatt-hours. The larger the kWh capacity, the more energy your battery can store. Aside from price, a battery’s energy storage capacity should be one of your biggest considerations when battery shopping. Your battery should be sized based on your household’s energy usage and which appliances or areas in your home you want to keep powered up during an outage. Depending on your backup power goals, you might need multiple batteries to achieve what you’re looking for. The more energy you use, the larger your battery capacity will need to be. Batteries with more storage capacity tend to be more expensive, and powering everything in your home during an outage is a bit unrealistic. Because of this, we recommend choosing a few essentials to send backup power to. Things like your fridge, router, TV, microwave, and lights are good choices to keep you comfortable and ensure that the battery won’t run out of juice within the first hour or two. Just pick a few rooms to keep powered up instead of the entire house. Your installer should be able to size an appropriate battery system for your home based on your energy needs. Make sure that you’re both on the same page about the expectations of the battery and exactly what’s going to have power during an emergency. You don’t want any surprises. Many batteries on today’s market feature a modular design. Modular batteries are essentially a few small battery modules connected together inside one or several enclosures. So instead of one giant 15 kWh battery that weighs 300 pounds, you might have three small 5 kWh battery modules that sit on top of each other in a sort of “battery cabinet” or enclosure. This type of battery design often benefits you and the installer. Modular batteries offer you a bit more control over your battery’s capacity, allowing you to more easily find a size that’s “just right” for your energy needs. The biggest benefit is the ability to upgrade your energy storage capacity without having to buy another giant battery, as long as there’s room inside the battery enclosure. If you’re at maximum capacity, you’ll have to buy another battery enclosure. Modular batteries also tend to be easier for installers. The battery modules tend to weigh less than 60 pounds, making them much easier and safer to carry. Some batteries might only require one or two installers. This could save you some money on labor costs. In some batteries, each battery module is monitored separately, so if something goes wrong and you need maintenance, your installer can identify exactly which module is failing more quickly. If a module needs to be replaced, it’s usually as simple as pulling the dead module out and then sliding a new one in. You won’t need to go through the hassle of replacing the entire battery. A battery’s round-trip efficiency is exactly what it sounds like; how efficient the battery is at storing energy. Round-trip efficiency is the percentage of energy sent to the battery that actually makes it into storage without getting lost, typically to heat. The higher a battery’s round-trip efficiency, the less energy you’re losing. If your battery’s round-trip efficiency is 80%, this means 20% of the electricity sent to the battery is lost on its way to storage. You’ll notice most solar batteries have a round-trip efficiency of around 90%. Depth of discharge is the amount of energy you can use (discharge) from the battery relative to its maximum capacity. This number represents the amount of energy (in percentage form) you can safely use from your battery without damaging the battery, according to the manufacturer. Most manufacturers will disclose this figure, but some don’t. The closer the battery gets to 100%, the better. If the depth of discharge is not disclosed, you can get an idea of what it might be on your own as long as you know the battery’s maximum and usable capacities. Most will have a specified maximum (overall) capacity and a usable capacity. These capacity numbers can be used to calculate the depth of discharge by dividing the usable capacity by the maximum capacity and then multiplying the answer by 100. For example, if a battery has a maximum capacity of 10kWh and a usable capacity of 9kWh, then its depth of discharge is 90%. Even if you can drain your battery to zero, it’s not recommended. This can shorten its lifespan and make it harder for your battery to hold a charge over time. You’ll get more cycle life out of your battery by using as little energy from your battery as you can at a time. Some manufacturers have a little energy storage capacity set aside in the battery to be used to revive it if the battery runs out of charge. All batteries will have peak and continuous power output ratings, measured in kilowatts. Some manufacturers only disclose the continuous rating. These ratings essentially tell you how much power the battery can handle in certain situations. Peak power represents how much power the battery can put out all at once without risking damage. A battery can only “peak” for so long; this surge of power usually lasts for less than a minute. Kind of like when your air conditioner or fridge kicks on. Continuous power is the amount of power the battery can support at any given moment. If you live in a large home or have a lot of large power-hungry appliances that you plan on backing up, you’re going to want higher power output ratings. Larger appliances like your HVAC, refrigerator, pool pump, and EV charger are going to require more power to run. The battery in an EV is typically several times larger than the average home battery you use to power your house, so it’ll likely eat up your stored energy a lot faster. A reputable installer will be able to provide recommendations for your home based on your energy usage and power needs. Your home battery’s power output determines the number of loads you’ll be able to back up. Solar batteries are an expensive investment, so you should be expecting a good warranty. Most battery warranties will cover up to a certain number of years, cycles, or throughput and offer an end-of-warranty capacity guarantee. Years: You can expect most battery warranty periods to last at least 10 years. We’ve seen plenty of manufacturers offering 12-year warranties as well. Anything above 12 years is pretty uncommon, but some batteries on the market offer 15-year warranties. Just keep in mind that once your battery hits a certain cycle count or delivers a certain amount of energy during its lifetime, your warranty will expire, regardless of how many years you have left. Cycles: Any time you drain your battery, it needs to recharge. This process is called a cycle. Like most batteries, your battery will slowly lose its ability to hold a full charge over time. Many manufacturers will typically cover a certain number of cycles in the warranty agreement. The average warranty usually guarantees somewhere between 4,000 and 8,000 cycles. There are outliers on the market that will cover 10,000 cycles or more. Some batteries, like the Tesla Powerwall and the SolarEdge Home Battery, offer unlimited cycle warranties. Throughput: Some battery warranties include a throughput clause. The battery’s throughput is the total amount of energy (typically measured in megawatt-hours) that the battery is expected to deliver during its entire lifetime. This means your warranty is valid until your battery hits its throughput. In most cases, if you manage to hit your throughput before your warranty period ends, your warranty will expire. End-of-warranty capacity: Your battery’s usable capacity will decrease over time. A battery’s end-of-warranty capacity is the manufacturer’s guarantee that your battery will be able to store up to a certain percentage of energy by the time