RENEWABLE ENERGY: THE CLEAN FACTS

Wind and sun oriented are controlling a perfect energy transformation. This is what you need to think about renewables and how you can help have an effect at home.
Solar Energy
Solar Energy
Sun powered, or photovoltaic (PV), cells are produced using silicon or different materials that change daylight straightforwardly into power. Disseminated galaxies create power locally for homes and organizations, either through roof boards or local area projects that power whole areas. Sun based ranches can produce power for a large number of homes, utilizing mirrors to think daylight across sections of land of sunlight based cells. Drifting sun based homesteads or "floatovoltaics" can be a successful utilization of wastewater offices and waterways that aren't naturally touchy. Sunlight based supplies somewhat more than 1% of U.S. power age. However, almost 33% of all new creating limit came from sun powered in 2017, second just to petroleum gas. Sun oriented energy frameworks don't create air toxins or ozone depleting substances, and as long as they are dependably sited, most sunlight based boards have not many natural effects past the assembling interaction.
Wind Energy
Wind Energy
We've made considerable progress from older style wind plants. Today, turbines as tall as high rises with turbines almost as wide in measurement prepare for action all throughout the planet. Wind energy turns a turbine's sharp edges, which takes care of an electric generator and produces power. Wind, which represents somewhat more than 6% of U.S. age, has become the least expensive fuel source in numerous pieces of the country. Top breeze power states incorporate California, Texas, Oklahoma, Kansas, and Iowa, however turbines can be put anyplace with high wind rates like ridges and open fields or even seaward in untamed water.
Hydroelectric Power
Hydroelectric Power
Hydropower is the biggest sustainable power hotspot for power in the United States, however wind energy is before long expected to assume control over the lead. Hydropower depends on water commonly quick water in an enormous waterway or quickly diving water from a high point and converts the power of that water into power by turning a generator's turbine sharp edges. Broadly and globally, huge hydroelectric plants or super dams are frequently viewed as nonrenewable energy. Uber dams redirect and decrease common streams, confining access for creature and human populaces that depend on waterways. Little hydroelectric plants (an introduced limit underneath around 40 megawatts), painstakingly oversaw, don't will in general reason as much natural harm, as they redirect just a negligible portion of stream.
Biomass Energy
Biomass Energy
Biomass is natural material that comes from plants and creatures, and incorporates crops, squander wood, and trees. At the point when biomass is singed, the compound energy is delivered as warmth and can create power with a steam turbine. Biomass is frequently erroneously portrayed as a spotless, inexhaustible fuel and a greener choice to coal and other non-renewable energy sources for creating power. In any case, late science shows that numerous types of biomass particularly from backwoods produce higher fossil fuel byproducts than petroleum derivatives. There are additionally unfortunate results for biodiversity. All things considered, a few types of biomass energy could fill in as a low-carbon alternative under the right conditions. For instance, sawdust and chips from sawmills that would some way or another rapidly deteriorate and discharge carbon can be a low-carbon fuel source.
Geothermal Energy
Geothermal Energy
In the event that you've at any point loose in an underground aquifer, you've utilized geothermal energy. The world's center is probably just about as warm as the sun's surface, because of the sluggish rot of radioactive particles in rocks at the focal point of the planet. Penetrating profound wells carries hot underground water to the surface as an aqueous asset, which is then siphoned through a turbine to make power. Geothermal plants commonly have low emanations on the off chance that they siphon the steam and water they use once more into the supply. There are approaches to make geothermal plants where there are not underground supplies, but rather there are worries that they may build the danger of a seismic tremor in regions previously viewed as topographical problem areas.
Nuclear
Nuclear
Atomic force, the utilization of supported atomic parting to create warmth and power, contributes almost 20% of the power produced in America. The United States has utilized atomic force for over 60 years to create solid, low-carbon energy and to help public protection exercises. The Energy Department's Office of Nuclear Energy's essential mission is to progress atomic force as an asset fit for making significant commitments in gathering our country's energy supply, ecological, and energy security needs. By zeroing in on the improvement of cutting edge atomic advances, NE upholds the Administration's objectives of giving homegrown wellsprings of secure energy, lessening ozone depleting substances, and upgrading public safety. Atomic force stays a significant piece of our country's energy portfolio, as we endeavor to diminish fossil fuel byproducts and address the danger of worldwide environmental change.
Bioenergy
Bioenergy
Biomass is a natural environmentally friendly power source that incorporates materials like farming and timberland buildups, energy yields, and green growth. Researchers and architects at the Energy Department and National Laboratories are discovering new, more productive approaches to change over biomass into biofuels that can replace ordinary fills like gas, diesel, and fly fuel. Bioenergy can help guarantee a monetarily strong and secure future while decreasing natural effects through: 1.Developing moderate homegrown fills and co-items 2. Propelling clean fuel sources 3.Generating homegrown responsibilities to help the development of the U.S. bioeconomy. Innovative work to change inexhaustible carbon and waste assets into feedstocks for transformation to biofuels, bioproducts, and bio power will reasonably grow biomass asset potential in the United States.
Hydrogen and Fuel Cells
Hydrogen and Fuel Cells
The Hydrogen and Fuel Cell Technologies Office (HFTO) centers around exploration, advancement, and exhibit of hydrogen and power module advances across various areas empowering development, a solid homegrown economy, and a perfect, evenhanded energy future. Hydrogen is the least difficult and most bountiful component known to man. It is found inside water, petroleum derivatives, and all living matter, yet it seldom exists as a gas on Earth—it should be isolated from different components. There are different homegrown assets that can be utilized to deliver hydrogen, including renewables (wind, sun oriented, hydropower, biomass, and geothermal energy), atomic force, and petroleum products (like flammable gas and coal – with carbon catch and sequestration). The U.S. at present creates in excess of 10 million metric huge loads of hydrogen each year, around one-seventh of the worldwide inventory.

What are the best solar batteries available? Top brands and products of 2021 compared

Reading Time: 8 minutes Storage systems are becoming increasingly attractive home upgrades for homeowners across the country. Whether you’re looking for self-consumption, rate arbitrage during peak hours, or back-up power in case of emergencies, storage systems can provide greater independence, resiliency, and savings–especially if you have solar panels and live in a state without net metering.  Because storage systems […]

Reading Time: 8 minutes Storage systems are becoming increasingly attractive home upgrades for homeowners across the country. Whether you’re looking for self-consumption, rate arbitrage during peak hours, or back-up power in case of emergencies, storage systems can provide greater independence, resiliency, and savings–especially if you have solar panels and live in a state without net metering.  Because storage systems […]Reading Time: 8 minutes

Storage systems are becoming increasingly attractive home upgrades for homeowners across the country. Whether you’re looking for self-consumption, rate arbitrage during peak hours, or back-up power in case of emergencies, storage systems can provide greater independence, resiliency, and savings–especially if you have solar panels and live in a state without net metering. 

Because storage systems have become so popular, many companies are now in the market, making it more challenging to compare and decide between the different brands and products available. In this article, we’ll explain some of the most important factors for comparing solar batteries and we’ll discuss some of the best brands and products available now.

Save thousands on a solar and storage installation

Key takeaways:


  • Comparing solar batteries can be challenging, but it’s important if you want to find the storage system that best fits your needs.
  • Some of the major metrics for comparing solar batteries fall under: chemistry & configuration, power & performance, warranty, and price. 
  • The top brands and products for solar batteries include: Enphase’s Encharge, Tesla’s Powerwall, Generac’s PWRcell, Panasonic’s EverVolt, sonnen’s eco, LG Chem’s RESU, Electriq Power’s PowerPod 2.
  • Visit the EnergySage Marketplace for custom quotes from pre-vetted installers for solar-plus-storage systems. 

How to compare solar batteries

There’s a lot to consider when choosing a solar battery! We’ve broken it down into four different categories: chemistry & configuration, power & performance, warranty, and, of course, price. We’ll explain some of the major considerations for each category and then show how the top brands and products stack up. To get a full breakdown of how to choose your battery, check out this article.

Chemistry & configuration

Understanding the different chemistries and configurations available for solar batteries can be difficult, so we’ve outlined some different factors you’ll want to consider before choosing the battery that’s right for you.

  • Chemistry: lithium-ion batteries come in various chemistries, but the top batteries on our list are either Lithium Nickel Manganese Cobalt Oxide (NMC) or Lithium Iron Phosphate (LFP). NMC batteries are perhaps the most common solar batteries, but LFP batteries are starting to gain traction because they tend to have higher power ratings and longer lifespans. 
  • Integrated inverter: batteries can come with or without an integrated inverter. Storage systems without an integrated inverter need to be paired with an external, third-party inverter. Storage systems with an integrated storage inverter are able to convert the usable alternating current (AC) energy from your home to storable direct current (DC) energy, and back again. If your storage system has an integrated hybrid inverter, it can cover both the production from your solar panels and the requirements of your storage system, providing efficient integration for solar-plus-storage systems. 
  • Coupling: batteries can be either AC- or DC-coupled. AC-coupled storage systems have traditionally been the most common for residential solar systems because they are easy to install, especially if you already have solar panels and are retrofitting your storage system. However, if you’re planning to install a new solar-plus-storage system, installing a DC-coupled storage system may be a better option because it will provide a higher overall efficiency. 
  • Flexibility of configuration: many battery manufacturers offer different configurations for your storage system so you can size your system according to your needs. Some offer a series of batteries with different capacities and many batteries can be “stacked,” which means that you can add additional batteries to build the storage capacity that you want. 

At a glance: chemistry & configuration of best batteries

BatteryChemistryIntegrated inverterCouplingFlexibility of configuration
Enphase EnchargeLFPYes - storageAC2 different capacity, can stack multiple
Tesla PowerwallNMCNo, unless you get Powerwall+ACCan stack up to 6
Generac PWRcellNMCYes - hybridDC4 different capacities, can stack up to 2
Panasonic EverVoltNMCYes - hybridAC or DC2 different capacities, can stack up to 6 (DC only)
sonnen ecoLFPYes - storageAC7 different capacities
LG Chem RESUNMCNoACCan stack up to 2
Electriq Power PowerPod 2LFPYes - hybridAC or DC3 different capacities, can stack up to 3 (AC) or 4 (DC)

Power & performance

To choose the storage system that meets your needs, you’ll want to compare the power and performance of the different offerings before making a decision. We’ll explain some of the key factors that impact your battery’s power and performance.

  • Usable capacity: measured in kilowatt-hours (kWh), usable capacity is a measure of the maximum amount of electricity stored in your battery on a full charge.
  • Power rating: measured in kilowatts (kW), a battery’s power rating determines the maximum amount of electricity that can be output at a single time. 
  • Depth of discharge: the depth of discharge (DoD) indicates the percentage of the battery that has been discharged relative to the overall capacity of the battery. Many battery manufacturers specify a maximum DoD level for optimal battery performance and generally batteries with higher percentages are considered better quality products. 
  • Roundtrip efficiency: the roundtrip efficiency is a measure of electrical losses involved with charging and discharging a battery. The higher the percentage, the more efficient the battery is at converting incoming electricity into stored electricity, and then back into usable electricity. 

At a glance: power & performance of best batteries

BatteryUsable capacityPower ratingDepth of dischargeRoundtrip efficiency
Enphase Encharge3.36, 10.08 kWh1.28, 3.84 kW100%89%
Tesla Powerwall14 kWh5.0 kW100%90%
Generac PWRcell9, 12, 15, 18 kWh3.4, 4.5, 5.6, 6.7 kW84%96.5%
Panasonic EverVolt11.4, 17.1 kWh4.4, 5.5 kWNot disclosed84% (AC), 89% (DC)
sonnen eco5, 7.5, 10, 12.5, 15, 17.5, 20 kWh3, 4, 8 kW100%81.6%
LG Chem RESU9.3 kWh5.0 kW95%94.5%
Electriq Power PowerPod 210, 15, 20 kWh7.6 kWNot disclosed96.6%

Warranty

Sifting through warranties for the information you need can be confusing and time-consuming. We’ll discuss some of the key things to look for in battery warranties and assess how the top brands and products compare. Check out this article for more information on solar battery warranties. 

  • Warranty period: most popular energy storage systems come with a 10-year warranty that covers the integrity and output of your system. 
  • End of warranty capacity: many manufacturers promise a certain level of performance by the time your warranty term is up. To calculate the warrantied capacity at the end of the warranty term, multiply the end of warranty capacity by the battery’s usable capacity.
  • Cycle clause: each time you drain and charge your battery, it’s called a cycle. Each cycle slightly reduces your battery’s ability to hold a full charge–thus, some manufacturers include a cycle clause which means that if you hit your warrantied number of cycles before your battery reaches the end of its warranty period, it could end your warranty term. 
  • Throughput clause: the throughput clause includes the total energy a manufacturer expects the battery to deliver throughout its lifetime. Stated in terms of megawatt-hours (MWh), these clauses stipulate that if you reach your battery’s throughput before the end of its warranty period, it could end your warranty term. For easy comparison, we’ve stated the throughput clause by kWh of usable capacity. To calculate the total throughput, simply multiply the number we’ve provided by the usable capacity of the battery.  

At a glance: warranties of best batteries

BatteryWarranty periodEnd of warranty capacityCycle clauseThroughput clause
Enphase Encharge10 years70%4,000 cyclesN/A
Tesla Powerwall10 years70%N/A2.7 MWh / kWh
Generac PWRcell10 yearsN/AN/A2.5 MWh / kWh
Panasonic EverVolt10 years60%N/A2.65 MWh / kWh
sonnen eco10 years70%10,000 cyclesN/A
LG Chem RESU10 years60%N/A2.4 MWh / kWh
Electriq Power PowerPod 210 years70%N/A3 MWh / kWh

Price

Comparing the price of batteries isn’t exactly straightforward. The cost of your battery will vary based on the factors we’ve outlined so far and could reflect the cost of the total installation or just the Manufacturer’s Suggested Retail Price (MSRP). It’s important to assess the price of batteries next to the usable capacity, as this will have the greatest impact on what you pay. You’ll also want to consider the different configurations that are available because it can sometimes be cheaper to stack two smaller batteries than to install one large one. 

At a glance: usable capacity vs. price of best batteries

BatteryUsable capacityPrice
Enphase Encharge3.36 & 10.08 kWhFull installation: $6,000 to $20,000
Tesla Powerwall14 kWhFull installation: $9,600 to $15,600
Generac PWRcell9 to 18 kWhFull installation: starting at $9,999
Panasonic EverVolt11.4 & 17.1 kWhFull installation: $15,000 to $20,000
sonnen eco5 to 20 kWhJust battery: starting at $10,000
LG Chem RESU9.3 kWhFull installation: $9,500 to $13,000
Electriq Power PowerPod 210 to 20 kWhJust battery: likely more than PowerPod 1, which is $9,799 to $19,999

Best solar batteries

We evaluated solar battery brands and products based on the metrics described above to create a list of the best solar batteries available today. Each battery comes with different pros and cons: the best storage solution for you may not be the best solution for your neighbor! Be sure to take a look at what we consider to be the highlights of each battery so you can choose a solution that best fits your needs. If you’re interested in learning more about the batteries we’ve included in our list, you can check out our more in-depth reviews of each product, or you can head over to the EnergySage Buyer’s Guide, where you can compare different types of equipment based on efficiencies, warranties, and more. 

Enphase Encharge

Highlights: inverter integration, battery chemistry, and DoD.

Enphase is one of the biggest names in inverter technology, but in 2019 it entered into the battery market with the Enphase Encharge. Thus, it’s no surprise that one of the biggest draws of the Encharge is its fully integrated Enphase IQ Series microinverter technology. The Encharge also uses state of the art LFP chemistry, which generally translates to a longer lifespan for your battery and allows for its impressive DoD of 100 percent.

To read our full review of the Enphase Encharge, check out this article. 

Tesla Powerwall

Highlights: stackability, DoD, warranty, and price.

Tesla has quickly become one of the biggest names in the home energy storage market after launching the Tesla Powerwall in 2015. The Powerwall has a sleek design and is built to be stackable, meaning you can include multiple Powerwalls in your storage setup to increase your usable capacity. Tesla’s Powerwall also boasts a DoD of 100 percent, and Tesla backs up their battery with a competitive 10-year warranty that includes a throughput clause of 37.8 MWh (2.7 MWh / kWh) and a guarantee of 70 percent capacity at the end of the warranty term. The Powerwall also runs at the lower end of the price range for solar batteries. 

To read our full review of the Tesla Powerwall, check out this article.

Generac PWRcell

Highlights: roundtrip efficiency and price.

Generac has long been a leader in the backup power space, but recently made its foray into energy storage when it acquired battery manufacturer Pika Energy in 2019 and subsequently launched the Generac PWRcell. The PWRcell has one of the highest roundtrip efficiencies of the batteries on this list at 96.5 percent. It’s also one of the more affordable storage system options available and is best if you’re looking to install solar-plus-storage because it’s a DC-coupled setup, which means higher overall efficiency. 

To read our full review of the Generac PWRcell, check out this article.

Panasonic EverVolt

Highlights: flexibility of configuration.

Panasonic is one of the world’s largest battery cell manufacturers and in 2019, they officially entered the solar battery market with the launch of the EverVolt. The EverVolt is highly configurable, allowing you to design the storage system that fits your needs. It comes in two different capacities–11.4 kWh and 17.1 kWh–which can both be either AC- or DC-coupled. This means that if you already have a solar system, you can easily retrofit the EverVolt with the AC-coupled model, or if you are installing solar-plus-storage, you might want to choose a DC-coupled model, allowing for higher efficiency. With the DC-coupled version, you can also stack up to six EverVolt batteries if you want to maximize your energy storage. 

To read our full review of the Panasonic EverVolt, check out this article.

sonnen eco

Highlights: battery chemistry, capacity/power, DoD, and warranty.

In 2016, sonnen, one of the most well known companies in energy storage, announced the sonnen eco. The eco uses advanced LFP battery chemistry, which is known for high power ratings and lifespans. The eco doesn’t disappoint: the largest battery in the lineup boasts the largest maximum power of the batteries in this list at 8 kW and one of the largest usable capacities at 20 kWh. It also has an impressive DoD of 100 percent and a competitive 10-year or 10,000 cycles warranty guaranteeing 70 percent capacity at the end of the warranty term. 

To read our full review of the sonnen eco, check out this article–and if you’re interested in their “luxury” battery offering–the ecoLinx–check out this article. 

LG Chem RESU

Highlights: roundtrip efficiency and price

LG is a huge name in the home electronics industry and their battery subsidiary, LG Chem, produces one of the most popular solar batteries in the U.S. market: the LG Chem RESU 10H. While the RESU is on the smaller end of usable capacity at 9.3 kWh, it includes a high roundtrip efficiency–the highest of the NMC batteries on this list–at 94.5 percent. It’s also one of the most affordable storage systems in the market, starting at around $9,500 for a full installation and can be a great choice if you’re looking for a smaller storage solution.

To read our full review of the LG Chem RESU, check out this article–and if you’re interested in their newest model–the RESU Prime–check out this article.

Electriq Power PowerPod 2

Highlights: flexibility of configuration, chemistry, capacity/power, roundtrip efficiency, and warranty.

In 2021, Electriq Power, a U.S.-based energy storage company, announced an update to their newest product, the PowerPod 2: instead of only offering a DC-coupled system, similar to the Panasonic EverVolt, they now allow you to choose between DC- and AC-coupled versions. The PowerPod 2 comes in three different usable capacities and you can stack up to three of them for the AC-coupled version, or up to four of them for the DC-coupled version. Electriq Power’s PowerPod 2 uses LFP chemistry, allowing the largest battery in their lineup to have one of the highest power ratings of the batteries on this list at 7.6 kWh. This battery also includes one of the highest usable capacities at 20 kWh and the highest roundtrip efficiency of the batteries in this list at 96.6 percent. Electriq Power includes an impressive 10-year warranty to cover the PowerPod 2, with a throughput clause of 3 MWh per kWh, and guarantees 70 percent capacity at the end of the warranty term.

To read our full review of the Electriq Power PowerPod 2, check out this article–and if you’re interested in their original model–the PowerPod 1–check out this article. 

Choosing the best solar battery for your home

The best way to decide on a solar-plus-storage system is to compare multiple quotes. On the EnergySage Marketplace, you’ll receive free, online quotes from pre-vetted installers and free advice from our team of Energy Advisors. Choosing a reliable installer can significantly reduce your risk of encountering battery issues down the line. Interested in a certain battery product? Simply make a note in your profile so installers know to include that product in your quotes. 

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