Solar Panels + Backup Battery Systems in Hanford, CA: What to Know Before You Combine Them

One of the most common surprises for Hanford homeowners: a grid-tied solar system automatically shuts off during a power outage. That's not a defect — it's a required safety feature called anti-islanding, which prevents electricity from flowing back onto lines that utility workers may be repairing. In Kings County, where triple-digit summer heat drives heavy AC loads and PG&E has issued Public Safety Power Shutoff events, that shutdown can leave you without power exactly when you need it most. Pairing solar with a backup battery solves this by letting your system 'island' — running your home independently from the grid.

How Do Solar Panels and a Backup Battery Work Together?

Solar generates power during the day, the battery stores what you don't use immediately, and your home draws from that stored energy at night or during an outage — whether the grid is up or down.

Think of the battery as the missing link. Without it, your solar panels produce power that either gets used instantly or sold back to the grid through net metering. With a battery in the loop, excess generation gets saved rather than exported, so you have a reserve ready when the grid goes down or when peak-rate hours kick in.

When both systems are installed together as one project, the wiring is cleaner, the conduit runs are shared, and only one permit gets pulled — reducing both labor time and the coordination headaches that come from hiring two separate contractors. You can learn more about what this looks like in practice on the backup battery systems service page.

Can You Add a Battery to an Existing Solar System?

Yes — retrofitting a battery onto an existing solar installation is a common and practical upgrade, though compatibility depends on your current inverter type and the age of your system.

Older string inverters may not be compatible with certain battery systems without an additional component called an AC-coupled inverter. Newer hybrid inverters are often designed to accept battery storage directly. The key is having a licensed electrician evaluate your existing setup before recommending a battery model or brand.

Using the same contractor for both the original solar work and a battery retrofit also means they already know your panel layout, load profile, and conduit routing — which typically speeds up the retrofit process compared to starting fresh with a new company.

Do You Need a Panel Upgrade Before Installing Solar and a Battery?

Not always — but sometimes yes, and the honest answer depends on your current electrical panel's age, amperage capacity, and available breaker space.

Many Hanford homes built before the 1990s have 100-amp panels that were sized for a much lighter electrical load. Adding solar, a battery system, and possibly an EV charger can push that capacity to its limit. A licensed electrician will check your existing panel during a site assessment and tell you upfront whether an upgrade is needed before the solar and battery work begins. Skipping this step and discovering the limitation mid-project costs more in the long run. If your panel does need work first, panel upgrade services are part of the same electrical scope — not a separate vendor relationship.

What Does Permitting Look Like in Hanford, CA?

Both solar and battery installations require permits through the City of Hanford or Kings County, and the utility interconnection process runs through PG&E for most Hanford addresses.

When both systems are permitted under one combined project, the inspection process is typically consolidated — one site visit instead of two separate ones scheduled weeks apart. A single licensed contractor pulling all permits also means the paperwork reflects the actual system design, reducing the chance of a correction notice that delays final inspection.

PG&E's net metering program, which credits you for excess solar energy sent to the grid, requires an interconnection agreement filed alongside the permit. Getting all of this done under one roof keeps the timeline tighter and puts the coordination burden on the contractor rather than the homeowner.

Is It Cheaper to Install Solar and a Battery Together or Separately?

Installing both at once is almost always more cost-effective than two separate mobilizations — primarily because trenching, conduit runs, and inspection fees are shared across one project instead of duplicated.

There's also a federal Investment Tax Credit (ITC) consideration: when solar and battery are installed together, the battery is generally eligible for the same credit as the solar panels. A battery added later as a standalone retrofit may face different eligibility rules depending on how it's charged. Consult a tax professional for your specific situation, but the combined-project timing can matter for how credits are calculated.

If budget requires phasing, solar first is still a reasonable path — just understand that the second mobilization for the battery will carry its own labor and permitting costs. Either way, having one contractor who knows both phases of the project reduces the chance of mismatched equipment or wiring that has to be redone.

Combining solar panel installation with a backup battery system gives Hanford homeowners both lower long-term utility costs and real protection when summer heat pushes the grid to its limits.

Schedule your combined solar and battery assessment with Rodriguez Electric Co. to get an honest evaluation of your home's readiness and the best sequencing for your project.