Are sodium ion batteries the next big thing in solar storage?

Batteries are becoming a main staple of residential solar installations. You’ll need one if you want to store energy to use when the sun isn’t out, as well as during power outages. If you have an off-grid solar installation, your battery is literally the lifeline of your home.

At the moment, lithium ion (Li-ion) is the top choice for solar batteries, as this type is very reliable and can be found in leading battery storage products, including the Tesla Powerwall, Generac PWRcell, and LG Chem. 

However, sodium ion batteries are a promising technology, because they are inherently safer to use and are theoretically cheaper to produce due to material abundance. The technology has seen significant advancements and initial deployments in the past few years, moving beyond just breakthroughs.

Here’s a little energy storage joke:

• Q: Are sodium ion batteries coming soon?

• A: Na.

What is a sodium ion battery?

A sodium ion battery uses sodium as a charge carrier. The internal structure of sodium ion batteries is similar to lithium ion batteries, which is why they are often pitted against each other. Sodium ion batteries are rechargeable just like lithium ion, lead acid, and absorbent glass mat (AGM) batteries. 

Learn more:

• Are lithium ion solar batteries the best energy storage option?

• Should you choose a lead acid battery for solar storage?

• All about AGM batteries 

Development for sodium ion batteries dates back to the 1980’s and has significantly accelerated in recent years due to challenges with scaling lithium ion batteries, including rising material costs and geopolitical concerns related to acquiring critical materials like lithium, cobalt, and nickel.

There has been extensive research associated with optimizing Na-ion battery cells, specifically related to using Prussian blue as a cathode material. The Na-ion battery pack is capable of taking on different usable shapes, ranging from traditional cylindrical batteries to rectangular pouches. These various form factors are ideal for commercialization, allowing this battery type to be used for energy storage, electric vehicles, and portable devices.

Sodium ion battery vs. lithium ion battery technologies

Let’s compare sodium ion batteries with two popular types of lithium ion batteries – nickel manganese cobalt (NMC) and lithium iron phosphate (LFP).

These lithium ion batteries are the most common types of solar energy products used in residential solar photovoltaic (PV) systems.

	Sodium ion	NMC	LFP
Availability	Emerging - limited commercial availability	Widely available	Widely available
Cost	Cheapest	Cheaper	Most expensive
Energy density	Lowest	Highest	Moderate
Safety	Safest	Least safe	Safer than NMC
Round-trip efficiency	92%	90-95%	92-98%

Energy density and efficiency 

While earlier sodium ion batteries had lower energy density, current advancements show Na-ion batteries achieving 120-160 Wh/kg, with some prototypes nearing 175 Wh/kg. This is becoming comparable to LFP lithium-ion cells, which are typically 160-180 Wh/kg. NMC batteries still generally offer higher energy density.

For the same capacity, Na-ion batteries are physically larger and heavier than Li-ion. A 10 kilowatt-hour (kWh) lithium ion battery will likely take up less space inside your home than a 10 kWh sodium ion battery would, even though they have the same capacity. This could be an issue if you have limited space on your property.

All three battery technologies offer more than 90% round-trip efficiency. This means that the batteries are effective when it comes to minimizing energy losses, allowing more of the energy generated by your solar panels to be stored, instead of being lost during the storage process. 

Both Na-ion and Li-ion batteries achieve comparable round-trip efficiencies (85-95%) in Battery Energy Storage System (BESS) applications. The differences are very small and generally not a distinguishing factor in residential applications.

Safety 

Sodium ion batteries offer inherent safety advantages. They generally have better tolerance to overcharging and short-circuiting, utilize non-flammable electrolytes, and offer good low-temperature performance, retaining 80-90% capacity at -20°C. Although stable, lithium batteries can be prone to thermal runaway events when improperly used, charged, or stored, which has led to fire safety concerns.

Recently, the New York City Fire Department (FDNY) issued a warning about the fire risks of lithium ion batteries due to several incidents involving lithium ion batteries catching fire. However, these occurrences are rare and should not stop you from purchasing lithium ion batteries for solar energy storage at home. 

With that said, LFP is generally considered safer than NMC due to its thermal stability. While lithium-ion batteries have a longer established track record, sodium-ion technology is rapidly gaining traction and proving its safety profile in initial deployments.

Cost 

Cost is a major factor in battery technology adoption; they add several thousands of dollars to a solar system installation. 

Sodium ion batteries are projected to have lower overall manufacturing and raw material costs than lithium ion batteries because they use vastly more abundant materials. For comparison, current Li-ion residential solutions typically range from $150-$250 per kWh for the battery component itself (excluding inverter and installation). Industry analysts predict Na-ion battery packs could reach $40-$60 per kWh at scale for US residential use, a significant reduction from current Li-ion prices. As of early 2026, the average installed cost per kWh of usable storage for leading lithium-ion brands in the US is around $850–$950.

Lithium ion batteries heavily use lithium, and often cobalt and nickel, in the manufacturing process. Costs for lithium have seen significant volatility. Sodium ion batteries generally avoid these critical materials, which helps lower material costs and secures the supply chain. Sodium is approximately 1,000 times more abundant in Earth's crust than lithium, making raw material costs for Na-ion batteries estimated to be 20-30% lower than LFP (lithium iron phosphate) batteries. This abundance minimizes geopolitical supply risks and environmental impact associated with specific mining operations.

In fact, the challenges associated with acquiring lithium are fueling the development of sodium ion batteries. Many believe a new type of battery should be released in order to keep up with demand for energy storage.

Availability 

While early Na-ion batteries were mostly prototypes or demo releases, some commercial products are now available, with residential solutions entering the market. For instance, California-based UNIGRID has shipped its Na+Casa residential battery in Europe, with US installations expected by the end of 2026, pending North American certification requirements (UL 9540 listing). As of June 2026, there are no confirmed UL 9540-listed US residential sodium-ion products.

On the other hand, lithium-ion solar batteries for home energy storage systems are being sold by numerous battery manufacturers worldwide. These products are currently the battery technology of choice for both consumers and top brands or sellers. You can easily buy them online or from a local solar installer.

Companies developing sodium ion batteries

There are several companies actively developing and launching sodium ion batteries. Many of these businesses have moved beyond prototypes and are now delivering or are very close to delivering Na-ion batteries to mainstream consumers, particularly for stationary storage applications.

Bluetti 

Bluetti manufactures solar panels, as well as LFP batteries for portable use and home battery backup. 

Based in Nevada, Bluetti announced a sodium ion solar generator in early 2022. While Bluetti has a track record of success in the solar generator space, specific details about the residential availability and impact of their sodium-ion offerings for home use in 2026 are not prominent, suggesting their initial product may not have achieved widespread residential market penetration as initially anticipated.

Contemporary Amperex Technology (CATL) 

CATL is a global battery maker, and holds more than 30% market share for lithium ion batteries used in electric vehicles. 

Based in China, CATL launched Naxtra, its mass-producible sodium-ion battery brand, in early 2025. The company is actively focusing its efforts on increasing the energy density of the battery and expanding its applications beyond electric vehicles into stationary storage.

CATL is a significant player in the nascent sodium ion battery space because it has the ability to quickly scale production due to its large operating capacity, which consists of over 185,000 employees (as end of 2025)

Natron Energy 

Natron Energy previously offered a compact sodium ion battery for data centers, telecoms, and rack-mount applications. However, the company ceased operations in September 2025 after failing to secure funding, cancelling plans for a $1.4 billion factory in North Carolina and closing its facilities in Michigan and California. Its products are no longer available for purchase.

AMTE Power 

AMTE Power develops and manufactures batteries for commercial use. The company has launched sodium ion batteries for electrochemical energy storage and transportation. They work with Faradion, a sodium ion battery producer, to boost their manufacturing and sales efforts.

The company’s sodium ion battery is very slim, taking on the shape of a square pouch. The battery is low power and isn’t really suitable for home solar installation yet.

Sodium batteries: promising solution that’s still under development

Sodium ion batteries are next-generation solutions for the growing residential solar industry. 

Many view it as a way to scale energy storage, because, compared to lithium ion technology, it uses widely abundant and sustainable materials. Low production costs for sodium ion batteries could also boost product deployment. While still maturing, this battery type has moved beyond early stages, with production scaling and initial deployments now underway, particularly for grid-scale and emerging residential applications.

Sodium ion batteries offer significant advantages, particularly when it comes to sustainability and cost. While conventional lithium-ion batteries have a longer history and established track record in residential applications, Na-ion batteries are quickly accumulating real-world performance data through early deployments and rigorous testing. Mainstream sodium-ion batteries currently offer a cycle life of 3,000–6,000 cycles, comparable to LFP Li-ion batteries, with some commercial cells claiming 10,000+ cycles, demonstrating their reliability.

If sodium ion batteries prove to be a viable option for traditional solar batteries over the long term, then it would be easier to recommend them for home solar panel installations. You would know the time is right to purchase them when:

• Local solar installation companies begin offering or recommending them

• You can easily buy the products online

Sodium ion batteries are rapidly progressing towards serving as a mainstream alternative to traditional batteries. While widespread US residential adoption is still a few years away for some, with initial products expected by late 2026, it is still a prudent choice to commit to currently available lithium-ion solar batteries for home energy storage for your solar installation. However, those with specific needs, such as exceptional low-temperature performance or enhanced safety, might consider waiting for certified Na-ion options.

Sources:

1. The Benefits of Having a Sodium Battery for Energy Storage (adeptrenewables.com)

2. Polaris Market Research Releases Sodium-ion Battery Market Outlook 2026–2034: Energy Storage Investments Drive Growth (batterytechassociation.org)

3. UNIGRID's sodium-ion home battery debuts in Europe, US is next (electrek.co)

4. highstar.com (en.highstar.com)

5. Sodium-Ion Battery vs. LFP: Which is Best for Home Backup? (energy.ecoflow.com)

6. LFP vs. Sodium-Ion Home Battery: Why LFP Wins in 2026 (And What the Natron Collapse Tells You About the Wait) (korapower.com)

7. nadionenergy.com (nadionenergy.com)

8. Why sodium-ion batteries will reshape grid-scale energy storage (news.gm.com)

9. Solar Battery Cost 2026: $6,000–$12,000 After Incentives (All Models) (nrgcleanpower.com)