The backup battery choice you didn’t know you had: li-ion, or vanadium flow?
Whether it’s to keep the lights on after a natural disaster or just to avoid peak energy rates, more people than ever are adding battery energy storage to their home solar systems. With some 45% of home solar customers saying yes to home batteries last year, the big question isn’t whether or not to get one – it’s what kind to get.
Two options stand out: lithium ion, and vanadium flow. Here’s the information you need to make the right choice.
SKIP THE STORY: get me prices on both types of batteries.
Lithium-ion or “li-ion” batteries are the batteries you’re probably most familiar with. They’re used in most laptops, smartphones, and EVs – and for good reason!
Over the last few decades, billions of dollars have been poured into li-ion R&D, and the resulting batteries are energy dense, almost entirely recyclable, and readily available, with literally millions of li-ion batteries in the market today.
That sort of market ubiquity and like-for-like competition among vendors and manufacturers has driven per kWh costs down continually. And those lower costs? They’re driving adoption in big solar markets like California, Texas, and Hawaii, where between 68 and 100% of residential solar quotes have home backup batteries “attached,” and Tesla – thanks to the slick new Powerwall 3 and its integrated solar inverter – is the most quoted brand.
Most quoted home solar batteries
As good as they are, li-ion batteries aren’t perfect. Li-ion batteries degrade over time, losing capacity with use and needing to be replaced after 10-15 years. And, while the risk of a lithium battery fire is increasingly and exceedingly low, it’s also very real – leading to intense fires that are difficult to put out with conventional fire-fighting methods.
Vanadium flow batteries address both of those shortcomings, offering 20-30 years of usable service life without degradation and with little (or, depending on who you believe, zero) chance of the sort of “thermal runaway” that leads to li-ion battery fires.
Flow battery diagram
If you’re not familiar with flow batteries, the Wikipedia page is a great first learning step (I hope – I’m still wrapping my brain around them). Once there, you’ll find that a flow battery works kind of like a fuel cell – charged ions pass through the membrane, causing electrons to flow through an external circuit, generating usable electricity.
The energy capacity (kWh) of a flow battery is determined by the volume of the electrolyte fluids in the tanks (bigger = more), while the power output (kW) depends on the size of the electrochemical cell stacks.
That is, of course, to say that a comparable vanadium flow battery will be significantly bigger and more complex than a li-ion solution. That added complexity, combined with the relative rarity of vanadium flow batteries on the market, mean that the same economies of scale and manufacturer/vendor competition haven’t acted to drive costs down in the same way that they have in the li-ion space.
Spec + price comparison
| Battery | Usable Capacity (kWh) | Continuous Power Output (kW) | Round‑Trip Efficiency | Average Price per kWh* | Coupling |
|---|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 | 11.5 | 97–97.5% | $1,133 | DC or AC |
| StorEn Vanadium Flow* | 30 | 5 | ~75–80% | $500–$900 | DC or AC |
*Based on StorEn’s modular 30 kWh system. The company doesn’t post pricing (or I couldn’t find it), and the prices shown are based on Google and Reddit searches. Prices may vary by region, so click here to get localized pricing.
As you can see, there are pros and cons to both setups. The li-ion batteries are proven tech, but the Gen X-ers and Boomers out there will tell you: 10 years is not a long time, and the thought of replacing your batteries (or, more likely, your inverter) every ten years isn’t a pleasant one.
That said, the vanadium flow batteries I could find seem to “top out” at about 5 kW of continuous output – so if your AC draws more than 5 kW continuously (possible in a large Texas or Arizona home or barnodminium), the system won’t be able to power it.
The final conclusion, then, comes down to what you value as an individual. If you want maximum output to keep the lights on and ride out a power interruption like nothing happened with a decade of reliability baked in, a li-ion setup might work. If you’re primarily interested in keeping the food and medicines in your refrigerator fresh, think replacement is a hassle, and the thought of a one-in-a-million battery fire taking out the 90-point Lancia Aurelia B20 GT that lives in your garage keeps you up at night, the “absolutely will not burn” vanadium flow option might be a no-brainer.
And, don’t forget: while you do need a home backup battery to access solar power during an outage, you do not need a home solar system to take advantage of battery storage.
You don’t need a home solar panel system to reap the benefits of home battery backup. But you’ll get the most out of your system when you pair them together — especially if your utility doesn’t pay you much for the excess electricity your solar panels generate and send to the grid.
That’s a lot to digest, but I hope you let us know which way you’re leaning – or what alternative battery chemistry you prefer – in the comments. And, if you’re looking for some options to giving Elon more money to turn Grok into a far-right propaganda machine, check out these great Powerwall alternatives.
If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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Robinhood stock hit an all-time high Friday as the financial services platform continued to rip higher this year, along with bitcoin and other crypto stocks.
Robinhood, up more than 160% in 2025, hit an intraday high above $101 before pulling back and closing slightly lower.
The reversal came after a Bloomberg report that JPMorgan plans to start charging fintechs for access to customer bank data, a move that could raise costs across the industry.
For fintech firms that rely on thin margins to offer free or low-cost services to customers, even slight disruptions to their cost structure can have major ripple effects. PayPal and Affirm both ended the day nearly 6% lower following the report.
Despite its stellar year, the online broker is facing several headwinds, with a regulatory probe in Florida, pushback over new staking fees and growing friction with one of the world’s most high-profile artificial intelligence companies.
Florida Attorney General James Uthmeier opened a formal investigation into Robinhood Crypto on Thursday, alleging the platform misled users by claiming to offer the lowest-cost crypto trading.
“Robinhood has long claimed to be the best bargain, but we believe those representations were deceptive,” Uthmeier said in a statement.
The probe centers on Robinhood’s use of payment for order flow — a common practice where market makers pay to execute trades — which the AG said can result in worse pricing for customers.
Robinhood Crypto General Counsel Lucas Moskowitz told CNBC its disclosures are “best-in-class” and that it delivers the lowest average cost.
“We disclose pricing information to customers during the lifecycle of a trade that clearly outlines the spread or the fees associated with the transaction, and the revenue Robinhood receives,” added Moskowitz.
Robinhood is also facing opposition to a new 25% cut of staking rewards for U.S. users, set to begin October 1. In Europe, the platform will take a smaller 15% cut.
Staking allows crypto holders to earn yield by locking up their tokens to help secure blockchain networks like ethereum, but platforms often take a percentage of those rewards as commission.
Robinhood’s 25% cut puts it in line with Coinbase, which charges between 25.25% and 35% depending on the token. The cut is notably higher than Gemini’s flat 15% fee.
It marks a shift for the company, which had previously steered clear of staking amid regulatory uncertainty.
Under President Joe Biden‘s administration, the Securities and Exchange Commission cracked down on U.S. platforms offering staking services, arguing they constituted unregistered securities.
With President Donald Trump in the White House, the agency has reversed course on several crypto enforcement actions, dropping cases against major players like Coinbase and Binance and signaling a more permissive stance.
Even as enforcement actions ease, Robinhood is under fresh scrutiny for its tokenized stock push, which is a growing part of its international strategy.
The company now offers blockchain-based assets in Europe that give users synthetic exposure to private firms like OpenAI and SpaceX through special purpose vehicles, or SPVs.
An SPV is a separate entity that acquires shares in a company. Users then buy tokens of the SPV and don’t have shareholder privileges or voting rights directly in the company.
OpenAI has publicly objected, warning the tokens do not represent real equity and were issued without its approval. In an interview with CNBC International, CEO Vlad Tenev acknowledged the tokens aren’t technically equity shares, but said that misses the broader point.
“What’s important is that retail customers have an opportunity to get exposure to this asset,” he said, pointing to the disruptive nature of AI and the historically limited access to pre-IPO companies.
“It is true that these are not technically equity,” Tenev added, noting that institutional investors often gain similar exposure through structured financial instruments.
The Bank of Lithuania — Robinhood’s lead regulator in the EU — told CNBC on Monday that it is “awaiting clarifications” following OpenAI’s statement.
“Only after receiving and evaluating this information will we be able to assess the legality and compliance of these specific instruments,” a spokesperson said, adding that information for investors must be “clear, fair, and non-misleading.”
Tenev responded that Robinhood is “happy to continue to answer questions from our regulators,” and said the company built its tokenized stock program to withstand scrutiny.
“Since this is a new thing, regulators are going to want to look at it,” he said. “And we expect to be scrutinized as a large, innovative player in this space.”
SEC Chair Paul Atkins recently called the model “an innovation” on CNBC’s Squawk Box, offering some validation as Robinhood leans further into its synthetic equity strategy — even as legal clarity remains in flux across jurisdictions.
Despite the regulatory noise, many investors remain focused on Robinhood’s upside, and particularly the political tailwinds.
The company is positioning itself as a key beneficiary of Trump’s newly signed megabill, which includes $1,000 government-seeded investment accounts for newborns. Robinhood said it’s already prototyping an app for the ‘Trump Accounts‘ initiative.
WATCH: Watch CNBC’s full interview with Robinhood CEO Vlad Tenev
Korean auto giants Hyundai and Kia think lower-priced EVs will help minimize the blow from the new US auto tariffs. Hyundai is set to unveil a new entry-level electric car soon, which will be sold alongside the Kia EV2. Will it be the IONIQ 2?
Hyundai and Kia shift to lower-priced EVs
Hyundai and Kia already offer some of the most affordable and efficient electric vehicles on the market, with models like the IONIQ 5 and EV6.
In Europe, Korea, Japan, and other overseas markets, Hyundai sells the Inster EV (sold as the Casper Electric in Korea), an electric city car. The Inster EV starts at about $27,000 (€23,900), but Hyundai will soon offer another lower-priced EV, similar to the upcoming Kia EV2.
The Inster EV is seeing strong initial demand in Europe and Japan. According to a local report (via Newsis), demand for the Casper Electric is so high that buyers are waiting over a year for delivery.
Hyundai is doubling down with plans to introduce an even more affordable EV, rumored to be the IONIQ 2. Xavier Martinet, CEO of Hyundai Motor Europe, said during a recent interview that “The new electric vehicle will be unveiled in the next few months.”
The new EV is expected to be a compact SUV, which will likely resemble the upcoming Kia EV2. Kia will launch the EV2 in Europe and other global regions in 2026.
Hyundai is keeping most details under wraps, but the expected IONIQ 2 is likely to sit below the Kona Electric as a smaller city EV.
More affordable electric cars are on the way
Although nothing is confirmed, it’s expected to be priced at around €30,000 ($35,000), or slightly less than the Kia EV3.
The Kia EV3 starts at €35,990 in Europe and £33,005 in the UK, or about $42,000. Through the first half of the year, Kia’s compact electric SUV is the UK’s most popular EV.
Like the Hyundai IONIQ models and Kia’s other electric vehicles, the EV3 is based on the E-GMP platform. It’s available with two battery packs: 58.3 kWh or 81.48 kWh, providing a WLTP range of up to 430 km (270 miles) and 599 km (375 miles), respectively.
Hyundai is expected to reveal the new EV at the IAA Mobility show in Munich in September. Meanwhile, Kia is working on a smaller electric car to sit below the EV2 that could start at under €25,000 ($30,000).
According to the report, Hyundai and Kia are doubling down on lower-priced EVs to balance potential losses from the new US auto tariffs.
Despite opening its new EV manufacturing plant in Georgia to boost local production, Hyundai is still expected to expand sales in other regions. An industry insider explained, “Considering the risk of US tariffs, Hyundai’s move to target the European market with small electric vehicles is a natural strategy.”
Although Hyundai is expanding in other markets, it remains a leading EV brand in the US. The IONIQ 5 remains a top-selling EV with over 19,000 units sold through June.
After delivering the first IONIQ 9 models in May, Hyundai reported that over 1,000 models had been sold through the end of June, its three-row electric SUV.
While the $7,500 EV tax credit is still here, Hyundai is offering generous savings with leases for the 2025 IONIQ 5 starting as low as $179 per month. The three-row IONIQ 9 starts at just $419 per month. And Hyundai is even throwing in a free ChargePoint Home Flex Level 2 charger if you buy or lease either model.
Unfortunately, we likely won’t see the entry-level EV2 or IONIQ 2 in the US. However, Kia is set to launch its first electric sedan, the EV4, in early 2026.
Ready to take advantage of the savings while they are still here? You can use our links below to find deals on Hyundai and Kia EV models in your area.
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As EVBox shuts down its Everon business across Europe and North America, EV charging provider Blink Charging is stepping up to offer support to customers caught in the transition.
EVBox’s software arm Everon recently announced it’s winding down operations alongside EVBox’s AC charger business. That’s left a lot of charging station hosts and drivers wondering what comes next. Now, EVBox Everon is pointing its customers toward Blink as a recommended alternative.
Blink says it’s ready to help, whether that means keeping existing chargers up and running or replacing aging gear with new Blink chargers.
“EVBox has played a significant role in the growth of EV charging infrastructure across the UK and Mainland Europe, and we recognize the trust hosts have placed in its solutions,” said Alex Calnan, Blink Charging’s managing director of Europe. “With the recent announcement of Everon’s withdrawal from the EV charging market, it’s natural to have questions about what this means for operations. At Blink, we want to assure Everon customers that we are here to help them navigate this transition.”
Blink says it’s able to offer advice, replacements, and ongoing network management to make the changeover as smooth as possible.
Everon users who switch to Blink will get access to the Blink Network portal via the Blink Charging app. That opens up real-time insight into charger usage and lets hosts set pricing, manage users, and download performance reports.
“At Blink, our charging technology is future-ready,” added Calnan. “With advancements like vehicle-to-grid technology on the horizon, our chargers are built to support the future of electric vehicles and charging habits.”
The company says its chargers are in stock and ready to ship now for any Everon customers looking to make the jump.
In October 2024, France’s Engie announced it would liquidate the entire EVBox group, which it said posted total losses of €800 million since Engie took over in 2017. EVBox is closing its operations in the Netherlands, Germany, and the US.
The 30% federal solar tax credit is ending this year. If you’ve ever considered going solar, now’s the time to act. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
FTC: We use income earning auto affiliate links. More.
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