title: "Adding a Battery in California Changed Everything" summary: "After NEM 3.0 gutted our export credits, a 13.5 kWh battery restored our savings and gave us outage protection." storyType: battery state: CA savingsMonthly: 85 systemSize: "13.5 kWh battery" date: "2026-02-10" tags:
- battery
- california
- NEM3
- backup
Why We Added Storage
We went solar in 2022 under NEM 2.0 in Southern California — 7.6 kW system, great production. But when we got switched to NEM 3.0 at our true-up in 2025, our export credits dropped by nearly 75%. Suddenly, our solar-only savings went from $180/month to about $60.
We needed a way to use more of our own power instead of exporting it for pennies.
Choosing a Battery
We evaluated several options:
- Tesla Powerwall 3 — 13.5 kWh, integrated inverter
- Enphase IQ Battery 5P — modular, 5 kWh per unit
- Franklin WH aPower2 — 13.6 kWh, whole-home capable
We went with the Tesla Powerwall 3 for the seamless integration and whole-home backup capability.
The Economics
| Item | Amount | |------|--------| | Battery | Tesla Powerwall 3 (13.5 kWh) | | Installed cost | $12,500 | | Federal ITC (30%) | −$3,750 | | Net cost | $8,750 | | Monthly savings restored | ~$85 | | Payback period | ~8.5 years |
The battery lets us:
- Self-consume 92% of our solar (was 45% without)
- Avoid peak TOU rates by discharging from 4-9 PM
- Keep lights on during outages (we had 3 in the past year)
Key Takeaways
- Under NEM 3.0, batteries aren't optional in California — they're essential for good solar economics.
- TOU rate arbitrage alone saves us $40-50/month.
- The peace of mind during outages is worth more than the financial return.
Composite story based on Southern California homeowner experiences. Results vary by utility, TOU rate schedule, and consumption patterns.