Solar Plus Battery Storage for Businesses: How They Work Together

Fri, 18 Sep 2026 18:00:28 GMT

A practical guide to commercial solar and energy storage.

Solar panels and battery storage are often discussed together, but they do different jobs.

Solar PV generates electricity. Battery storage holds available electricity so it can be used at another time.

For some businesses and commercial properties, combining the two can create a more flexible energy strategy. Solar can produce electricity during daylight hours, while battery storage may help a facility manage when that energy is used, reduce peak demand, improve energy resilience, and gain more control over long-term energy operations.

The right solution, however, depends on the property.

A warehouse with large daytime electrical loads may have very different needs from a nonprofit, agricultural operation, affordable housing community, or commercial building with critical equipment.

Here is what business and property owners should understand before deciding whether solar plus battery storage makes sense for their facility.

What Is Commercial Solar Plus Battery Storage?

A commercial solar-plus-storage system combines two technologies:

Solar photovoltaic panels convert sunlight into electricity.

Battery energy storage systems , or BESS, store available electricity so it can be used later.

Depending on the system design, a commercial battery may charge when solar production is high, when electricity from the grid is less expensive, or according to another programmed energy-management strategy.

The stored electricity can then be discharged when the facility needs it most.

That could include:

Periods of high electricity demand
Higher-cost utility periods
Times when solar production is lower
Certain grid outages
Other operating conditions identified during system design

The goal is not simply to add a battery to a solar installation. The goal is to determine how solar generation, storage capacity, utility rates, and facility operations can work together as one energy strategy.

How Do Solar Panels and Batteries Work Together?

Solar panels produce electricity whenever sufficient sunlight is available.

Without battery storage, that electricity is used or handled according to the facility's electrical configuration, utility arrangement, and applicable energy program.

With battery storage, some available electricity can potentially be stored and used later.

For example, a facility may produce significant solar energy around midday but experience its highest electricity demand later in the afternoon. A battery could potentially charge earlier and discharge during that later peak.

This ability to separate when electricity is produced from when electricity is used is one of the primary benefits of energy storage.

PurePoint Energy designs commercial solar and storage systems based on facility energy usage, electrical infrastructure, resiliency goals, site conditions, and budget rather than applying the same configuration to every property.

Can Battery Storage Reduce Commercial Demand Charges?

Yes, in some cases. Battery storage can help reduce commercial demand charges by supplying stored electricity during periods when a facility's grid demand would otherwise be at its highest.

Many commercial utility bills include more than charges for the total amount of electricity consumed.

They may also include demand charges, which can be based on the facility's highest level of electricity demand during a billing period.

Consider a facility that normally uses a moderate amount of electricity but has a short period during the day when several large systems operate at the same time. That brief spike can affect the demand portion of the bill.

A properly designed battery system may discharge during those peaks, reducing the amount of electricity the facility needs from the grid at that moment.

This strategy is often referred to as peak shaving or peak-demand management.

The actual financial benefit depends on factors including:

The utility rate structure
The size and frequency of demand peaks
Facility operating patterns
Battery size and power output
System controls
Existing solar production
Applicable tariffs and incentive programs

Because these factors vary significantly by property, demand-charge savings should be modeled using actual utility data rather than estimated from a general rule of thumb.

What Is Load Shifting?

Load shifting means changing when a facility draws electricity from the grid by storing energy during one period and using it during another.

Electricity may be more valuable at certain times than others.

For facilities on time-based utility rates, battery storage can potentially charge during lower-cost periods and discharge when grid electricity is more expensive.

Solar can add another dimension to this strategy.

If a facility's solar system generates more electricity during certain periods than the building immediately needs, storage may allow some of that available energy to be retained for later use, depending on the system and utility program.

The result can be greater control over the timing of energy use.

For commercial property owners, that flexibility may be useful when energy costs, operating schedules, and peak-demand patterns do not align neatly with solar-production hours.

How Can Battery Storage Help Businesses Control Energy Costs?

Commercial battery storage can support energy-cost management in several ways.

It is important to distinguish energy-cost control from guaranteed savings.

The economics of commercial energy storage should always be evaluated using the property's actual utility bills, tariff structure, operating profile, and project goals.

Can a Battery Power an Entire Business During an Outage?

Potentially, but not every commercial battery system is designed to power an entire facility during an outage.

Whether a battery can support a whole business depends on several factors:

Battery storage capacity
Battery power output
Facility electrical load
Length of the outage
Which systems must remain operational
Solar production available during the outage
Electrical design and controls
Whether the system is configured for backup operation

For many commercial properties, supporting every electrical load may not be the most practical or cost-effective approach.

Instead, the project may be designed around critical loads.

These could include:

Refrigeration
Communications systems
Security equipment
Essential lighting
Agricultural equipment
Pumps
Building controls
Certain tenant services
Critical production processes

Identifying those loads early allows the energy team to determine how much storage may be required and whether solar, batteries, generators, or a microgrid-ready approach should be evaluated.

What Happens to Solar During a Power Outage?

Many property owners assume that having solar panels automatically means the building will have electricity during a grid outage.

That is not necessarily the case.

Standard grid-connected solar systems are generally designed to shut down under certain outage conditions to protect utility workers and electrical infrastructure.

Providing electricity during an outage typically requires additional equipment and a system specifically designed to operate safely in backup or islanded conditions.

Battery storage can be an important part of that design, but the system must be engineered for the intended level of resilience.

For organizations where outages could significantly affect operations, resilience requirements should be discussed at the beginning of the project rather than added as an afterthought.

What Businesses May Benefit Most From Battery Storage?

Battery storage can be valuable in several commercial situations, but the best candidates tend to share certain characteristics.

Facilities With Significant Demand Charges

Businesses with pronounced electricity-demand peaks may have opportunities for peak-demand management.

Properties With Time-of-Use Rates

If electricity costs vary significantly depending on the time of day, storage may create opportunities for strategic load shifting.

Facilities With Critical Operations

Organizations that cannot easily tolerate interruptions may want to evaluate battery backup, critical-load support, or microgrid-ready systems.

Businesses With Existing or Planned Solar

Organizations already investing in solar may want to understand whether battery storage could add operational flexibility or resilience.

Agricultural Operations

Farms, greenhouses, refrigeration facilities, pumps, ventilation systems, and other agricultural loads can create unique energy and resilience requirements that may justify a storage analysis.

Multi-Family and Affordable Housing Properties

Storage may be considered as part of broader energy planning for common areas, critical building systems, resilience, and long-term property operations.

Nonprofits and Schools

Organizations with predictable budgets and community-focused missions may benefit from evaluating storage alongside solar, particularly when resilience or long-term energy planning is a priority.

Warehouses, Manufacturing, and Industrial Facilities

Large electrical loads, equipment schedules, refrigeration, machinery, and demand peaks may create opportunities that warrant detailed modeling.

Commercial Real Estate

Owners and investors may evaluate solar and storage in the context of operating expenses, property improvements, tenant needs, asset strategy, and long-term capital planning.

The fact that a property falls into one of these categories does not automatically mean battery storage is financially appropriate. It means the property may be worth evaluating.

How Is a Commercial Battery System Sized?

Commercial battery sizing begins with the facility's objectives.

There is no universal battery size that is right for every commercial property.

A professional analysis may consider:

Historical electricity consumption
Interval or demand data
Peak-demand patterns
Utility tariff structure
Solar production
Critical electrical loads
Backup duration goals
Electrical infrastructure
Available installation space
Future facility expansion
Budget
Incentives and financing options

For demand management, the focus may be on how much power the battery can deliver during short peaks.

For outage preparedness, storage duration may be more important.

For load shifting, both energy capacity and charging/discharging strategy become important.

That is why battery sizing should follow a clear definition of what the system is expected to accomplish.

Can Battery Storage Work Without Solar?

Yes. Commercial battery storage can be installed independently of solar in some applications.

A stand-alone battery may be charged from the grid and used for peak-demand management, load shifting, resilience, or other energy-management purposes.

Pairing storage with solar, however, can create additional options because the facility has an on-site generation source as well as stored energy.

Whether solar-only, storage-only, or solar-plus-storage makes the most sense should be determined through a facility-specific analysis.

What Is the Difference Between Energy Savings and Energy Revenue?

This distinction is important in commercial solar planning.

Not every project creates value through a simple one-for-one reduction in electricity purchased from the utility.

Depending on the utility program, tariff, ownership structure, and market, a project may create financial value through:

Reduced electricity purchases
Demand-charge reduction
Time-based energy management
Solar or renewable-energy revenue
Incentives
Tax benefits
Lease revenue
Other project-specific mechanisms

Some solar programs may use buy-all/sell-all or similar structures in which solar production is compensated separately rather than directly offsetting the building's electricity use.

Storage can also interact differently with those structures depending on program rules.

For this reason, a credible commercial solar-and-storage evaluation should examine both the technical energy flows and the financial structure of the project.

Should Solar and Battery Storage Be Planned Together?

When possible, yes. Evaluating solar and battery storage together can help create a more coordinated long-term energy plan—even if storage is not installed immediately.

Planning both technologies together can help the project team consider:

Electrical infrastructure requirements
Future battery location
Solar system sizing
Critical loads
Interconnection
Controls
Operating objectives
Expansion plans
Financial strategy

A property may ultimately move forward with solar only, storage only, both technologies, or a phased approach.

The benefit of evaluating them together is that today's decisions can account for tomorrow's energy goals.

What Information is Needed for a Battery Storage Evaluation?

A useful first conversation should include as much of the following information as possible:

12 to 24 months of utility bills
Interval or demand data, if available
Property address
Facility operating hours
Major electrical loads
Demand-charge information
Existing or planned solar
Critical operations that would be affected by an outage
Electrical infrastructure information
Future equipment or building expansion
Energy and sustainability goals
Approximate budget and project timeline

The more accurately a project team understands how a facility operates, the more useful the storage analysis can be.

What Does a Commercial Solar and Storage Project Involve?

A successful project involves more than selecting panels and batteries.

PurePoint Energy's commercial solar and storage process includes evaluating energy usage and site conditions, designing solar PV and battery systems, completing professional installation and commissioning, and providing ongoing system monitoring and optimization.

The broader project may also require:

Engineering
Permitting
Utility interconnection
Equipment selection
Electrical upgrades
Incentive analysis
Financing considerations
Construction coordination
System commissioning
Monitoring
Long-term maintenance

Bringing these considerations together is particularly important for organizations with complex facilities and long-term operational requirements.

Start With the Facility, Not the Technology

Solar and battery storage can be powerful tools, but technology should not come before strategy.

The first questions should be:

How does this facility use energy? When does it use the most? What operations matter most during an outage? What are the organization's financial and sustainability priorities?

Those answers determine whether solar, battery storage, or a combination of the two can create meaningful value.

For commercial property owners, nonprofits, agricultural operations, multi-family affordable housing communities, schools, warehouses, and real estate investors, a property-specific analysis provides the clearest path forward.

PurePoint Energy helps organizations across Connecticut, Rhode Island, Massachusetts, and Westchester County evaluate customized commercial solar PV and battery energy storage solutions built around real energy needs and long-term goals.

Plan Today. Power Tomorrow. Plug Into The Sun.

Wondering if Battery Storage Makes Sense for Your Facility?

Every property has a different energy profile. Understanding yours is the first step toward determining whether battery storage can support demand management, resilience, energy-cost control, or broader sustainability goals.

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