A few years ago, many California homeowners installed solar without a battery and still saw strong value from it. Today the picture is different. Changes to how utilities credit solar exports, along with more frequent concerns about outages, have made solar battery storage a much bigger part of the conversation.
But a battery is not the right fit for every home. This guide explains what a battery does, how California’s current rules affect its value, and the questions to answer before you add one to a new or existing solar system.
What Does Solar Battery Storage Do?
Solar panels produce the most electricity in the middle of the day, when many households use the least. Without storage, that extra energy flows back to the grid. A battery stores some of it so you can use it later, typically in the evening when your home’s demand rises.
Some battery systems can also provide backup power during an outage. That requires the right equipment: compatible inverters, controls that safely separate your home from the grid, and enough capacity for the circuits you want to keep running.
How California’s Net Billing Tariff Changes the Math
Most new solar customers of PG&E and California’s other large investor-owned utilities who applied to connect on or after April 15, 2023 fall under the Net Billing Tariff, often called NEM 3.0. Under this program, electricity you send to the grid is credited at a rate based on its value to the grid at that time, rather than at the full retail rate.
Those export credits are usually lower than what you pay for electricity. As a result, energy you use yourself is often worth more than energy you export. A battery helps you keep more of your solar production for your own use, which is why storage has become far more common with new systems. According to the California Public Utilities Commission, batteries can also help customers take advantage of the higher-value hours when export credits rise.
If your home is on an older net metering program, adding or changing equipment can affect your arrangement, so it is important to confirm the impact with the utility before you authorize work.
What About Federal Tax Credits?
The federal Residential Clean Energy Credit, which covered solar and qualifying battery storage, ended for systems placed in service after December 31, 2025. Homeowners planning a project now should not count on that credit. Other incentives, such as California programs or utility offerings, may be available depending on eligibility, so check current programs and talk with a tax professional about your situation.
Backup Power: Decide What You Want to Keep Running
One of the most common misunderstandings about batteries is the idea that one battery will run an entire home through any outage. In reality, backup depends on two things: how much energy the battery stores and how much power it can deliver at once.
- Essential circuits: A refrigerator, lights, internet equipment, and a few outlets use relatively little power and are a common backup priority.
- Large loads: Central air conditioning, well pumps, electric ranges, and EV chargers draw much more and may require additional capacity.
- Duration: How long you want backup to last, and whether solar can recharge the battery during the day, shape the system size.
Many homes use a dedicated backup panel so the battery supports only the circuits that matter most. Deciding this early helps avoid mismatched expectations.
Can You Add a Battery to Existing Solar?
Often, yes. Whether it is straightforward depends on your current inverter, your electrical panel, available installation space, and the battery you choose. Some systems can add storage with an additional inverter or a battery designed for retrofits, while others need more equipment changes.
An electrician should review your existing system, panel capacity, and wiring before you choose a battery. Our solar panel upgrades and battery storage service starts with exactly that review.
Is a Battery Worth It for Your Home?
A battery may be a strong fit if you:
- Have or plan solar under the Net Billing Tariff and want to use more of your own production
- Want backup for essential circuits during outages
- Use a lot of electricity in the evening
- Plan to add an EV charger or electric appliances
It may be less compelling if your main goal is the lowest upfront cost and backup is not a priority. Savings are not guaranteed and depend on your usage, rates, battery settings, and solar arrangement.
Plan Your Battery With an Electrician
J&A Pro Electric Services is a family-owned, licensed and insured electrical contractor serving Contra Costa County. We bring more than 20 years of electrical experience to solar and storage projects, with an electrical-first approach to inverters, panels, and backup circuits.
Ready to talk it through? Schedule a solar consultation and we will explain your options and provide an upfront estimate.
Frequently Asked Questions
Does a solar battery work during a power outage?
Only if the system is designed for backup. Backup requires compatible equipment and controls that safely isolate your home from the grid.
How long will a home battery last during an outage?
It depends on the battery’s capacity, its charge level, and which circuits it powers. Backing up essential circuits only can extend runtime significantly.
Can I add a battery to my existing solar panels?
Often, yes. Inverter compatibility, panel capacity, space, and battery choice determine the work needed.
Will a battery lower my electric bill?
It can help, especially under the Net Billing Tariff, but results vary with usage, utility rates, and battery settings. Savings are not guaranteed.
