Why You Need a Battery With Solar in California

With California's NEM 3.0 policy, pairing solar panels with battery storage is no longer optional — it's essential for maximizing your savings. A battery lets you store excess solar energy during the day and use it during expensive peak hours (4–9 PM), saving you $0.40–$0.60 per kWh instead of getting just $0.05–$0.08 in export credits.

But which battery is right for your home? Here's our comprehensive breakdown of the best solar batteries available in California in 2026.

Top Solar Batteries for California Homes

1. Tesla Powerwall 3

The Powerwall 3 remains one of the most popular home batteries in California, and for good reason.

• Capacity: 13.5 kWh usable
• Continuous power: 11.5 kW (enough to power most homes)
• Round-trip efficiency: 90%
• Warranty: 10 years, unlimited cycles
• Price range: $12,000–$15,000 installed
• Best for: Whole-home backup, EV charging, high energy usage

The Powerwall 3 has a built-in solar inverter, which can simplify installation and reduce costs. Tesla's app provides excellent monitoring and control, including Storm Watch that automatically charges the battery before severe weather.

2. Enphase IQ Battery 5P

Enphase's modular battery system is ideal for homeowners who want flexibility.

• Capacity: 5 kWh per unit (stack up to 4 for 20 kWh)
• Continuous power: 3.84 kW per unit
• Round-trip efficiency: 96% (best in class)
• Warranty: 15 years or 6,000 cycles
• Price range: $6,000–$8,000 per unit installed
• Best for: Modular scaling, high efficiency, Enphase microinverter systems

The IQ Battery 5P uses lithium iron phosphate (LFP) chemistry, which is safer and lasts longer than traditional lithium-ion. Its modular design means you can start with one unit and add more later.

3. Franklin WH aPower2

Franklin Whole Home is gaining serious market share in California with its intelligent energy management.

• Capacity: 15 kWh usable
• Continuous power: 10 kW
• Round-trip efficiency: 89%
• Warranty: 12 years
• Price range: $13,000–$16,000 installed
• Best for: Whole-home backup, smart energy management, grid independence

Franklin's aGate intelligent controller manages your entire home's energy — solar, battery, grid, and generator — automatically optimizing when to store, use, or export energy.

4. SolarEdge Home Battery

SolarEdge's battery integrates seamlessly with their popular inverter platform.

• Capacity: 9.7 kWh per unit (stackable to 3 for 29.1 kWh)
• Continuous power: 5 kW per unit
• Round-trip efficiency: 94.5%
• Warranty: 10 years
• Price range: $10,000–$13,000 per unit installed
• Best for: Homes already using SolarEdge inverters, DC-coupled efficiency

5. Generac PWRcell

Generac brings its generator expertise to the solar battery space.

• Capacity: 9–18 kWh (modular)
• Continuous power: 9 kW
• Round-trip efficiency: 96.5%
• Warranty: 10 years
• Price range: $15,000–$20,000 installed
• Best for: High power output, whole-home backup, homes in fire-prone areas

How to Choose the Right Battery

Consider these factors when choosing your solar battery:

• Capacity (kWh): How much energy you need to store. Most homes need 10–15 kWh for daily cycling, or 20+ kWh for full backup
• Power output (kW): How much power the battery can deliver at once. Higher is better for running multiple appliances simultaneously
• Warranty: Look for at least 10 years. Some manufacturers guarantee a minimum capacity at end of warranty
• Chemistry: LFP (lithium iron phosphate) is safer and longer-lasting. NMC (nickel manganese cobalt) offers higher energy density
• Compatibility: Some batteries work better with specific inverter brands

Battery Costs and California Incentives

The average cost of a home solar battery in California ranges from $10,000 to $20,000 installed, depending on capacity and brand.

California's SGIP (Self-Generation Incentive Program) can provide significant rebates — $150–$1,000 per kWh depending on your eligibility. Homeowners in fire-prone areas, on medical baseline rates, or in disadvantaged communities can receive the highest rebates, potentially covering most of the battery cost.

Additionally, California's property tax exemption means your battery system won't increase your property taxes, even though it adds value to your home.

Let Us Design Your Battery System

The right battery depends on your home's energy usage, your solar system size, and your backup power needs. At Everysun, we help you choose the perfect battery and design a system that maximizes your NEM 3.0 savings.

Get a free consultation — we'll analyze your energy usage and recommend the best solar + battery combination for your California home.