Under California's NEM 3.0 policy, the economics of solar have shifted dramatically toward self-consumption. Instead of exporting excess solar energy to the grid at reduced rates, homeowners benefit most by storing that energy in a battery and using it during expensive peak evening hours (4-9 PM).
For California homeowners, battery storage also provides critical backup power during rolling blackouts and extreme heat events.
Head-to-Head Comparison
Tesla Powerwall 3: 13.5 kWh capacity, 11.5 kW continuous power, built-in inverter, 10-year warranty, $12,000-$15,000.
Enphase IQ Battery 5P: 5 kWh per unit (stackable to 60 kWh), 3.84 kW per unit, modular design, 15-year warranty, $5,000-$6,000 per unit.
Tesla Powerwall 3: The All-in-One Powerhouse
The Powerwall 3 is Tesla's latest generation battery with an integrated solar inverter. One unit covers most homes' evening and overnight needs. Best for homeowners who want comprehensive whole-home backup.
Enphase IQ Battery 5P: The Modular Approach
Enphase takes a modular approach — start with one unit and add more over time. Each unit operates independently, and the 15-year warranty is the longest in the industry. Best for homeowners who want to start small and expand.
Our Recommendation
For most California homeowners installing a new system, we recommend the Tesla Powerwall 3 for its capacity and integrated inverter. For those with existing Enphase microinverters, the Enphase IQ Battery 5P is the better choice.
How Battery Storage Fits the 2026 zero-down program Model
In 2026, the best way to get solar + battery is through a zero-down program that includes storage. The commercial provider claims the Section 48E credit on both the panels and the battery, then passes those savings to you through a lower rate. You get the benefit of battery backup and peak-rate arbitrage without paying $12,000-$15,000 out of pocket for a battery system.
California's SGIP rebate may also apply to battery installations through solar program providers, further reducing costs.
Not sure which setup is right for your home? Take our Solar Savings Quiz to check your 2026 zero-down program rate — battery storage options are included in your personalized estimate.