How Battery Storage and EV Fast Charging Work Together
- Aug 26
- 6 min read
Updated: 1 minute ago
DC fast charging can place significant power demands on a site.
Battery energy storage systems, or BESS, can help manage those demands by storing electricity and discharging it when charging loads are highest.
In the right location and under the right utility structure, pairing BESS with DC fast charging can create a more flexible energy system and potentially improve project economics.
But simply installing a battery next to EV chargers does not make a project viable.
The value depends on how the grid connection, utility tariff, charging demand, battery size, interconnection and operating strategy work together.
That is what makes BESS and EV fast charging an infrastructure question, not just an equipment question.
Why EV Fast Charging Creates a Power Challenge
DC fast chargers are designed to deliver large amounts of power to vehicles in relatively short periods of time.
Unlike slower charging, which can spread electricity consumption over several hours, fast charging can create substantial electrical loads, particularly when multiple vehicles charge at the same time.
For a site, that can mean:
More utility capacity may be required
Electrical infrastructure may need to be upgraded
Interconnection can become more complex
Peak demand may increase electricity costs
Utility upgrades can add cost and development time
This is where battery storage can become useful.
Think of BESS as a Buffer Between the Grid and the Chargers
A simple way to understand battery-buffered fast charging is to think of the battery as an energy buffer.
The grid supplies electricity to the site. The battery stores some of that electricity. When charging demand increases, the battery can discharge and provide additional power alongside the grid connection.
When charging demand declines, the battery can recharge.
This can reduce the need for the utility connection to supply every temporary spike in charging demand on its own.
The U.S. Department of Energy’s Joint Office of Energy and Transportation identifies similar potential benefits of battery-buffered charging, including supporting deployment where grid capacity is constrained, reducing certain utility costs through peak shaving and adding resiliency.
What Can Battery Storage Actually Do for an EV Charging Site?
1. Manage Peak Demand
Many commercial electricity customers are charged not only for the total electricity they consume, but also for how much power they demand at certain times.
When several fast chargers operate simultaneously, that demand can rise quickly.
A battery may be able to discharge during those periods, reducing the amount of power the site needs to draw from the grid at once.
Whether that creates meaningful savings depends on variables such as:
Utility tariff
Demand-charge structure
Charging utilization
Charger power levels
Battery size
Battery dispatch strategy
Storage-system cost
For investors, this makes the utility tariff an important part of underwriting.
2. Support Sites With Limited Grid Capacity
A well-located charging site does not necessarily have enough existing electrical capacity to support the full peak output of a proposed charging station.
Without storage, additional utility infrastructure may be required.
A battery-buffered system can potentially allow the grid to provide electricity more consistently while the battery supplies additional power during periods of higher charging demand.
This can be particularly relevant when existing capacity is limited or major utility upgrades would materially affect cost or deployment timing.
But there is an important limitation:
A battery does not eliminate the need for grid capacity.
The battery still needs to recharge.
If average demand consistently exceeds what the grid connection can supply, storage alone may not solve the problem.
The battery, chargers and grid connection therefore need to be evaluated as one system.
3. Shift When Electricity Is Purchased
Battery storage can also provide flexibility around when electricity is drawn from the grid.
Where time-of-use pricing applies, electricity may cost more during certain periods and less during others.
A battery may be able to charge during lower-cost periods and discharge when electricity prices or site demand are higher.
This type of operating strategy is related to energy arbitrage.
The economics depend on the utility rate structure, battery efficiency, operating restrictions and the spread between electricity prices during different periods.
4. Create Additional Operating Flexibility
Depending on the market, interconnection agreement, utility rules and system configuration, a battery may also have potential uses beyond supporting EV charging.
Those can include:
Energy arbitrage
Demand response
Capacity programs
Ancillary services
Utility programs
Other grid-support services
This can create the potential for a broader revenue stack.
But those revenue streams should never be assumed simply because a battery is installed.
For investors, the better question is not:
How many revenue streams can be listed?
It is:
Which revenue streams can actually be supported by the project’s location, interconnection, equipment and operating strategy?
BESS + DC Fast Charging in the Real World
Charge Capital’s Michael’s Plaza project in Eatontown, New Jersey provides a completed example of battery storage and EV fast charging developed together at an existing retail property.
The project combines:
660 kWh battery energy storage system
Six 200 kW dual-port DC fast chargers
Supporting utility and electrical infrastructure
Energy-management software and controls
The approximately $2 million project also received approximately $600,000 through an NJDEP grant and approximately $150,000 through the JCP&L Make-Ready Program.
Michael’s Plaza shows how distributed energy infrastructure can be integrated into an existing commercial property while maintaining the property’s primary retail use.
The chargers provide the customer-facing infrastructure.
The battery adds flexibility to how electricity can be stored, managed and delivered across the site.
Not Every EV Charging Site Needs a Battery
The ability to pair storage with EV fast charging does not mean the combination makes sense everywhere.
Adding BESS also adds:
Equipment cost
Engineering complexity
Controls and software
Maintenance requirements
Battery degradation considerations
Permitting and safety requirements
Additional capital needs
A site with abundant grid capacity, favorable electricity rates and predictable charging demand may not receive enough additional economic benefit from storage to justify that cost.
Another site may have constrained capacity, significant demand charges or a more favorable battery operating environment where storage creates considerably more value.
What Should Investors Evaluate?
Before combining BESS and DC fast charging, we believe several questions matter:
Grid Capacity How much power can the utility provide today?
Charging Demand How many chargers are planned, at what power level, and how often are they expected to operate simultaneously?
Utility Tariff How are energy consumption and peak demand billed?
Interconnection What studies, infrastructure or utility upgrades are required?
Battery Size How much power and energy should storage provide relative to expected charging demand?
Operating Strategy When will the battery charge and discharge?
Revenue Opportunities Can the battery participate in other utility or market programs when it is not supporting charging demand?
Project Economics Do the potential savings and revenue opportunities justify the cost of adding storage?
For a deeper look at these revenue sources, see How Battery Storage Projects Actually Make Money.
These variables are interconnected.
Changing the number or power level of chargers can change the battery requirements. Changing available grid capacity can alter the economics of the entire project. A different utility tariff can materially change the value of peak-demand management.
That is why the project should be evaluated as a complete energy system, rather than as a battery and a group of chargers considered separately.
The Opportunity Is in the Integration
EV fast chargers and battery storage perform different functions.
EV chargers deliver energy to vehicles.
Battery storage provides flexibility in how electricity is stored, delivered and managed.
When designed together, BESS can potentially help a charging site:
Manage periods of peak demand
Reduce exposure to certain demand charges
Support charging where grid capacity is constrained
Shift electricity consumption across pricing periods
Participate in additional energy-market opportunities where eligible
Make better use of existing electrical infrastructure
But the economics remain site-specific.
The strongest projects begin with a detailed understanding of the site, grid, utility territory, charging demand, battery configuration, interconnection and operating strategy.
At Charge Capital, those components are evaluated together as part of the broader process of moving distributed energy projects from site to operating asset.
See BESS + DC Fast Charging in Practice
See how Charge Capital brought battery storage and DC fast charging together at Michael’s Plaza in Eatontown, New Jersey.
Explore the Michael’s Plaza Case Study
See the project’s infrastructure, development process, incentive support and projected revenue model.
Disclosure: This content is for informational purposes only and does not constitute an offer to sell or a solicitation of an offer to buy securities. Any offering by Charge Capital Partners is made only through formal offering documents and is available only to verified accredited investors. Investments are speculative, illiquid, involve a high degree of risk, and may result in the loss of principal. Past performance is not indicative of future results. No return or investment outcome is guaranteed.
