Winter storm season is on its way to the Central Coast — and this year, forecasters are watching a strong El Niño pattern that historically means wetter, windier conditions and a higher chance of the atmospheric river storms that knock out power for days at a time. Add PG&E’s fire-season shutoffs into the mix, and it’s not a question of if the power goes out this winter, but how ready you’ll be when it does.
Ever lost power during a PG&E outage or a storm and watched your fridge, WiFi, and lights go dark all at once? A home battery backup system paired with your solar panels means that doesn’t have to happen. Instead of sending your extra solar energy back to the grid, you store it at home and use it during outages, at night, or during expensive peak-rate hours.
Allterra Solar installs a few different battery options for California homeowners, depending on your home’s size and goals. Here’s a simple solar battery comparison — so you can get backup power in place before the season’s first storm hits.
Why Add Battery Storage to Your Solar System?
A battery gives you three big things: backup power when the grid goes down, lower electric bills by using your own stored energy instead of buying it back from the utility, and more independence from rising energy rates. Think of it as a savings account for the energy your panels already make.
Why California Homeowners Are Adding Batteries
A couple of things happening in California make batteries a lot more worth it than they used to be. Under the newer NEM 3.0 billing rules, utilities pay solar owners much less for extra power sent back to the grid — so it’s more valuable to store that power yourself and use it later, rather than sell it back cheap. On top of that, many Central Coast and South Bay homeowners deal with PG&E’s planned power shutoffs during high fire-risk conditions, which makes battery backup less of a luxury and more of a practical need — especially heading into a winter with storms forecast to be more frequent than usual.
Tesla Powerwall 3: Power for the Whole Home
What to know: Tesla has designed this AC battery system for residential and light commercial use. It utilizes a lithium iron phosphate battery that runs much quieter and cleaner than a conventional gasoline back-up generator. There’s no exposed vents that expel heat or visible wires, making it a safer solution for households with kids or pets. The Tesla Powerwall 3 is compatible with new and existing solar panel systems. It can also work as a stand-alone home battery without solar panels. Tesla batteries can be installed with most brands of solar panels — you don’t need Tesla solar panels to install a Powerwall.
At a glance:
- 5 kWh of usable storage — enough to cover a typical evening or a good chunk of an outage
- 5 kW of continuous power, high enough to run several big appliances at the same time
- 5% efficient at getting your solar power into your home
- Doubles as your system’s solar inverter, not just a battery
- About 287 lbs, rated for indoor or outdoor installation
- 10-year warranty
Enphase IQ Battery 10C: Reliable and Redundant
What to know: Although they are one of the most recognizable brands in the solar industry for their line of microinverters, Enphase also offers an excellent alternative to the Tesla Powerwall. As the company’s fourth generation in its solar battery line, the IQ Battery 10C is becoming increasingly popular with homeowners who want a storage option that easily integrates into their Enphase solar installation.
At a glance:
- 10 kWh of usable storage
- 08 kW of continuous power
- 90% efficient
- Lithium iron phosphate (LFP) chemistry — one of the safest, longest-lasting battery types available
- Stackable up to 4 units if you need more capacity down the road
- 15-year warranty (or up to 6,000 charge cycles, whichever comes first)
FranklinWH aPower 2: Maximum Capacity, Built for the Long Haul
What to know: The aPower 2 is FranklinWH’s advanced second-generation home energy battery, designed to store energy from solar panels, the grid, generators, and EVs as part of its integrated energy ecosystem. Franklin designed the aPower 2 with a focus on providing “whole-home backup,” ensuring that property owners maintain power during outages. The battery supports a peak power output of 15 kW and a continuous output of 11.5 kW. The aPower 2 battery will also need to be teamed with a smart energy management unit from Franklin called the aGate. The aGate controls battery charging and power flow in the home, and can be set to charge the batteries from solar, the grid, and even an AC backup generator.
At a glance:
- 15 kWh of usable storage — the most of the three
- 10 kW of continuous power (up to 15 kW for short bursts, like when an AC unit first kicks on)
- 90% efficient
- Flood-resistant up to 29 inches from the bottom — a nice bonus if you’re in a flood-prone area
- Expandable up to 225 kWh total across multiple units
- 15-year or 60 MWh warranty, whichever comes later
So, Which One Is Right for You?
If you’re already set up with Enphase microinverters and want a dependable, expandable battery backed by an excellent warranty, the Enphase IQ Battery 10C is a strong pick. If you want strong whole-home backup with a trusted brand, the Tesla Powerwall 3 is a proven choice. And if you want the biggest capacity and the most flexibility for off-grid living, the FranklinWH aPower 2 is hard to beat.
The right choice really comes down to your home’s size, your typical energy use, and how much backup power matters to you — and that’s exactly what our team is here to help you figure out.
Don’t Wait for the First Storm to Find Out You Need Backup Power
Every home is different, and picking the right battery shouldn’t be a guessing game — and with a stronger-than-usual storm season on the horizon, now’s the time to get it sorted, not after the lights go out. Give Allterra Solar a call at 831.425.2608 or reach out through our website, and we’ll walk you through which battery fits your home best before winter arrives — no pressure, just straight answers.
GET MY FREE ASSESSMENT → allterrasolar.com
Serving Santa Cruz County, Monterey County, and the Central Coast.
Sources: American Society of Civil Engineers (ASCE) Infrastructure Report Card · J.P. Morgan 2025 Energy Outlook · McKinsey Global Energy Perspective · NEMA Electricity Demand Forecast · U.S. Energy Information Administration (EIA)
© 2026 Allterra Solar. This content is for educational and informational purposes only.
