Batteries are the Future of Solar for 2025 in California

Energy Service Partners installed 3000% more batteries in 2023 than in previous years and expects to continue that trend.

Battery storage projects are shaping up as the future of solar in California and beyond. Across the country, capacity has consistently grown since 2021, with projects getting larger each year. California has shown the greatest amount of growth, with more installed battery storage capacity than any other state, at 7.3 gigawatts (GW). The marked growth of distributed solar capacity in California supports the continued expansion of battery storage projects.

1. What is a Solar Battery?

A solar battery is a device used to store excess power provided by residential panels. The stored power can be used during times when solar panels are not generating at their peak capacity, such as nighttime, during storms, on cloudy days or when there are general power outages. When battery storage is not in place, or the battery storage limit has reached full capacity, the excess energy is sent back to the grid through net metering programs.

2. Benefits of Solar Battery Storage

Solar batteries offer numerous advantages for homeowners:

• Energy Independence: Reduce reliance on the grid and protect yourself from outages
• Maximize Solar Value: Store excess energy instead of sending it back at reduced rates
• Backup Power: Keep essential appliances running during blackouts
• Reduce Peak Charges: Use stored energy during expensive peak rate hours

Additional benefits include reducing the need for fuel-guzzling backup generators and adding capacity for EV charging. Their chemistry is safe and NEMA-rated for residential use, and the ROI for homes in blackout-prone areas is priceless.

Think of it this way: how much does a fridge full of spoiled food cost? Or several nights at a hotel? Can you put a price tag on keeping your devices charged, to communicate with family and let them know you're safe?

3. How Solar Batteries Work

Solar batteries are the most common method of storing power for residential installations. They store excess energy during periods of low usage and release it when demand rises. When a battery is charged with solar power, a chemical reaction takes place that enables it to store energy. When the battery is activated, the reaction reverses and the current is then released as electricity to safely use in your home.

PRO TIP: There are advantages to using each type of battery, depending on the homeowner's system. DC-coupled batteries connect directly to the solar panels and are generally more efficient. AC-coupled batteries connect to the home's electrical system and offer more flexibility for retrofitting existing solar installations.

4. Why Batteries Matter More Than Ever

With California's NEM 3.0 policies reducing the value of exported solar energy, batteries have become essential for maximizing your solar investment. By storing energy during the day and using it during peak evening hours, homeowners can:

• Avoid high time-of-use rates
• Reduce dependence on the grid
• Increase overall savings from their solar system

5. Popular Battery Options

Leading battery options for residential solar include:

• Tesla Powerwall: One of the most recognized names in home battery storage
• Enphase IQ Battery: Modular system that works well with Enphase microinverters
• Franklin WholHome: Designed for whole-home backup capabilities

The Future is Bright

As battery technology continues to improve and costs decrease, we expect even more homeowners to add storage to their solar systems. The combination of solar panels and battery storage represents the ultimate in energy independence and financial savings.

At ESP, we help homeowners design systems that maximize both solar production and storage efficiency. Contact us today to learn how adding a battery can enhance your solar investment!