Already have solar panels? You may be able to add a battery without replacing your existing installation. Don't have solar? Battery-only options are also available. Understand the benefits, limitations and California electricity-rate considerations before choosing equipment.
Batteries can serve different purposes. The best configuration depends on whether your priority is using more solar power yourself, maintaining electricity during outages or managing utility costs.
Store some of your daytime solar production for evening use instead of exporting it immediately to the grid.
A compatibility assessment determines whether the existing inverter and electrical equipment can support the proposed battery.
Learn about solar battery retrofitsA properly configured battery system can supply selected household loads when grid electricity is unavailable.
Backup duration depends on how much electricity is stored and which appliances or circuits are connected.
Understand backup powerCertain battery systems can charge from the grid and discharge later, subject to equipment and utility operating rules.
This may appeal to homeowners who cannot install rooftop solar or who want to evaluate storage separately.
Explore battery-only systemsCalifornia solar economics have changed. Under the Net Billing Tariff, commonly called NEM 3.0, new participating solar customers of Southern California Edison (SCE), Pacific Gas and Electric (PG&E) and San Diego Gas & Electric (SDG&E) generally receive significantly lower compensation for electricity exported to the grid than the retail price paid for electricity they purchase.
Export credits can vary by time and other tariff factors. This means the timing of solar production, household electricity usage and battery discharge can materially affect the economics of a system.
For example, rooftop panels may produce substantial electricity during the afternoon when no one is home. Without a battery, unused electricity can be exported. Later, when household electricity demand rises, the homeowner may purchase power from the utility at applicable retail rates.
A battery can store some of that excess daytime generation for later household consumption. Doing so may reduce electricity purchased during expensive periods.
However, a battery does not guarantee savings or a particular payback period. The outcome depends on installation cost, battery capacity, charging and discharging efficiency, household demand, utility rates and how the system is operated.
The statewide investor-owned utility Net Billing Tariff should not be applied automatically to every Southern California homeowner. Glendale Water & Power, Pasadena Water & Power, Burbank Water & Power and Los Angeles Department of Water and Power operate their own utility programs and rate structures. The exact utility and tariff should be confirmed before estimating battery savings.
Many existing rooftop solar systems can be evaluated for battery storage retrofits. You do not necessarily need to replace functional panels or rebuild the complete system.
The first step is determining how your existing equipment operates. A solar system using a string inverter may have different integration options from a system with microinverters.
Battery designs may use AC coupling, DC coupling or other manufacturer-specific configurations. The appropriate approach depends on equipment compatibility, desired backup functions and applicable electrical requirements.
In an AC-coupled configuration, battery storage is integrated on the AC side of the electrical system through compatible power-conversion and control equipment.
This approach can be useful for certain existing solar systems because the current solar inverter may be retained. However, compatibility must still be checked, especially if the homeowner wants solar charging during a grid outage.
Some systems connect solar generation and battery storage through compatible DC-side equipment. Depending on the installation, this may involve replacing or changing an existing inverter or other system components.
Neither configuration is automatically the best choice for every homeowner. The installer should explain the proposed design and why it suits the existing system.
Changes to an older solar system can sometimes affect utility interconnection arrangements. Before approving a retrofit, ask whether the proposed work could change existing net-metering or billing terms.
Backup power is one of the main reasons homeowners consider battery storage, particularly in areas affected by utility outages or planned power shutoffs.
A properly installed backup-capable battery can disconnect from the utility grid when required and supply power to designated circuits. This capability requires the appropriate controls, isolation equipment and system design.
Not every battery installation automatically provides backup. A grid-connected battery designed only for energy management may function differently from a system equipped for outages.
Some homeowners prioritize a smaller group of circuits, such as refrigeration, lighting, internet equipment and selected outlets. This can reduce the amount of energy needed during an outage.
Larger configurations may support more household loads, but whole-home backup should not be assumed merely because a battery has substantial storage capacity.
Air conditioning, electric heating, cooking equipment, pumps and EV charging can demand significant electrical power. The design must account for both instantaneous power requirements and total stored energy.
Battery capacity is commonly measured in kilowatt-hours (kWh). Power output is measured in kilowatts (kW). Both matter. A battery with enough stored energy may still be unable to start or supply certain large appliances if their power requirements exceed the system's capabilities.
Ask the installer which circuits will be backed up, what loads the system can support and what assumptions are used for any runtime estimate.
Yes. Certain home battery systems can operate without rooftop solar. These batteries charge from utility electricity and may discharge later for backup or energy-management purposes.
Battery-only installations may interest homeowners with roofs unsuitable for panels, those planning a future solar installation, or households primarily concerned about backup power.
Whether buying electricity at one time and using stored energy later makes financial sense depends on the applicable utility tariff and battery losses.
Charging and discharging also involve energy losses, so the amount of electricity later delivered is less than the amount originally used to charge the battery.
Grid charging, export permissions and participation in certain incentive programs may involve additional restrictions. These should be checked for the specific equipment and utility.
Brightstone Renewable Energy offers battery installations both with and without solar.
Battery brands differ in equipment design, usable capacity, output capability, backup architecture, monitoring, expandability and compatibility.
Comparing brand names alone is not enough to determine which battery suits a home. The complete installed system matters more than any single specification.
Tesla Powerwall is a residential energy storage product family designed for compatible solar and home electrical installations. Available functionality depends on the particular model and system configuration.
Homeowners considering Powerwall should ask about existing solar compatibility, backup equipment, monitoring integration and the electrical loads they want to support.
Enphase offers residential battery storage equipment within its energy system ecosystem. Enphase-based solar installations may have integration options depending on the installed microinverters, gateway and battery generation.
Existing Enphase equipment does not guarantee compatibility with every battery model. An installer should evaluate the complete configuration.
FranklinWH provides residential energy storage equipment designed for home energy management and backup-capable installations.
As with other manufacturers, system design must account for backup controls, electrical requirements, installation location and the homeowner's goals.
Brightstone reports certified installer status for Tesla, Enphase and FranklinWH. It also identifies certified installer relationships with SolarEdge, Qcells and SPAN.
These relationships do not mean every product is suitable for every home. Availability, compatibility and the final equipment recommendation should be established during the contractor's assessment.
A battery installation may require evaluation of the home's main electrical panel, service equipment, grounding and available installation space.
An older panel does not automatically need replacement, but its capacity, condition and compatibility with the proposed design must be checked.
Some projects may require a panel upgrade or additional electrical equipment. The installer should explain whether these improvements are necessary and include them in the project scope.
Brightstone offers main panel upgrades and related electrical services in addition to solar and battery installations.
The answer depends on your objective. A battery sized mainly for shifting solar electricity into evening hours may differ from one designed for extended outage support.
A useful assessment reviews recent electricity bills, hourly or interval usage data when available, existing solar production, major appliances and desired backup circuits.
If backup is important, distinguish the amount of energy you want to store from the amount of electrical power required at one time.
Also ask whether the system can be expanded later, and whether expansion would require changes to other installed equipment.
Avoid selecting battery capacity based only on a generic estimate of average household consumption. Two homes with similar monthly electricity bills can have very different daily usage patterns.
Financing can reduce the amount of cash needed at installation, but it does not eliminate the total cost of the system.
Brightstone reports offering $0-down financing options through GoGreen Home and Energy Loan Network. Approval, eligible work, interest rates, repayment periods and other terms depend on the applicable program and borrower.
Brightstone states that its systems are customer-owned rather than solar leases. Buyers should review the actual contract and financing documents to understand ownership and obligations.
The federal Residential Clean Energy Credit under Section 25D ended for homeowner expenditures made after December 31, 2025. Homeowners should not subtract a federal 30% purchase credit from a new 2026 battery project based on outdated promotional materials.
Other state or utility programs may have different requirements, funding limitations and eligibility rules. For example, California's Self-Generation Incentive Program has offered storage incentives to eligible customers, but availability and current terms must be verified before being included in an estimate. Commercial tax treatment is separate from the homeowner credit.
SoCal Solar Help is an independent information and referral website. Battery inquiries are referred to Brightstone Renewable Energy, a Brightstone Electric company, California contractor license #1086871.
Brightstone has been in business since 2017 and reports more than 500 completed projects, a 25-year workmanship warranty and 5.0-star ratings on Google, Yelp and Thumbtack. Warranty scope and terms should be reviewed in the contractor's written agreement.
Its service area extends from Lancaster to San Diego, subject to project eligibility and scheduling availability.
Call or text (818) 863-6250 to discuss battery storage for an existing solar installation or a home without solar panels.
A useful proposal should explain what the equipment will do in your particular home.
How much electricity can the installed battery supply under normal operating conditions? Make sure the estimate uses usable rather than merely nominal capacity.
Can the equipment support the appliances you want operating simultaneously? Review continuous and applicable surge capabilities.
Will the proposed installation support essential circuits, selected larger loads or the entire home? Get the intended backup scope in writing.
Confirm whether existing solar equipment can remain and how solar charging will function during normal operation and grid outages.
Review manufacturer battery warranty terms, any applicable capacity guarantees and the separate contractor workmanship coverage.
Ask for the full installed price, including electrical modifications, backup equipment, permits and any financing costs.
Often, yes. Many solar installations can be evaluated for battery retrofits. Compatibility depends on the inverter, electrical configuration, equipment requirements and utility rules.
Yes. Compatible battery systems can charge from utility electricity without rooftop panels. The usefulness and economics depend on electricity rates, backup needs and equipment operating restrictions.
On applicable SCE, PG&E and SDG&E Net Billing Tariff arrangements, exported solar electricity generally receives much lower credits than the retail price of purchased electricity. Storage may help shift daytime solar generation into higher-value usage periods.
Not necessarily. Backup capability depends on the battery's power output, usable energy capacity, household loads and installed backup equipment. A system should be designed around the circuits and appliances you want supported.
No. The federal Residential Clean Energy Credit ended for homeowner expenditures made after December 31, 2025. Do not assume a 30% federal purchase credit applies to a new 2026 project. Other incentives have separate eligibility rules.
Brightstone reports certified installer status for Tesla, Enphase and FranklinWH, among other manufacturers. Product suitability and availability depend on the project's requirements.
Discuss your existing solar, backup goals and utility situation with a licensed installer.
Let Brightstone know whether you already have solar panels, which utility serves your property and whether your main priority is backup power or energy cost management.
SoCal Solar Help does not sell or install batteries. All professional assessments, quotes and installations are performed by the referred licensed contractor.