Do You Need a Battery with Solar in California?

Under California's NEM 3.0, adding a battery to your solar system isn't just a nice-to-have — it's close to essential for maximizing your return. But batteries add cost. Here's how to decide if one is right for you.

Why Batteries Matter Under NEM 3.0

Under NEM 2.0, exporting solar energy earned near-retail credits. Under NEM 3.0, export credits dropped 75%. The math changed:

• Without battery: Mid-day solar goes to the grid for ~$0.06/kWh credit. You buy grid power at 4–9 PM for $0.50+/kWh.
• With battery: Mid-day solar charges your battery. You use stored energy during peak hours. Net savings: $0.50+/kWh instead of $0.06/kWh.

Battery Costs in 2026

• Tesla Powerwall 3: $10,000–$12,000 installed (13.5 kWh)
• Enphase IQ Battery 5P: $8,000–$10,000 installed (5 kWh per unit, stackable)
• Franklin WholHome: $12,000–$15,000 installed (13.6 kWh)
• SolarEdge Home Battery: $9,000–$11,000 installed (9.7 kWh)

Remember: the 30% federal tax credit applies to batteries too, so a $12,000 battery effectively costs $8,400.

When a Battery Is Worth It

• You're on PG&E, SCE, or SDG&E — High TOU rates make self-consumption extremely valuable
• You have high evening usage — AC, EV charging, cooking during 4–9 PM peak
• You want backup power — California experiences increasing PSPS (Public Safety Power Shutoffs) events
• You want maximum savings — Solar + battery delivers 20–40% more savings than solar alone under NEM 3.0

When You Might Skip the Battery

• You're on a municipal utility with lower rates (SMUD, LADWP)
• Your utility offers favorable net metering independent of NEM 3.0
• Budget is extremely tight and you want to start with solar only

Our Take

For most California homeowners on IOU utilities, a battery pays for itself within 5–6 years and adds $25,000–$40,000 in additional savings over 25 years. The question isn't whether you can afford a battery — it's whether you can afford not to have one.

Calculate your solar + battery savings or get a free quote.