Under California's NEM 3.0 rules, sending solar back to the grid pays little — so the value is in storing your own power and using it when it's worth the most. Add in 4–9 p.m. peak pricing and an aging grid, and a battery has gone from "nice to have" to the heart of the system. Here's how to buy one wisely.
Step 1 — Define your goal: backup, savings, or both
This is the single most important decision, because it drives everything else:
- Bill savings — the battery charges on cheap midday solar and discharges during the expensive evening peak ("peak shaving"). Sizing follows your evening usage.
- Backup power — the battery keeps your home running during outages and Public Safety Power Shutoffs. Sizing follows what you want to keep on, and for how long.
- Both — most homeowners want a bit of each; a good design balances them.
Step 2 — Understand the two numbers that matter
Every battery is described by two specs, and people constantly confuse them:
- Capacity (kWh) — how much energy it stores. This determines how long it can run your home.
- Power (kW) — how much at once it can deliver. This determines what you can run simultaneously (an AC compressor and an electric oven draw a lot at the same instant).
Step 3 — Decide what you're backing up
You don't always need to power the whole house:
- Essential / partial backup — fridge, Wi-Fi, lights, a few outlets and maybe one AC. Less battery needed, lower cost.
- Whole-home backup — everything, including central AC and EV charging. More capacity and power (often multiple batteries), higher cost.
In the Antelope Valley and other hot inland areas, keeping at least one AC zone running is usually a priority — worth telling your installer up front.
Step 4 — Compare the equipment
The mainstream options (we install Tesla Powerwall and Enphase IQ Battery, among others) are all strong. When comparing, look past the brand name at:
- Usable capacity & power — the real, usable kWh and kW, not just the headline number.
- Warranty — typically 10 years; check the guaranteed throughput/retained capacity.
- Round-trip efficiency — how much you get back out of what you put in.
- Stackability — can you add a second unit later as your needs grow (an EV, a heat pump)?
Step 5 — New install vs. retrofit
If you're buying solar and storage together, the system is designed as one — simplest and most efficient. If you already have solar and want to add a battery, that's a retrofit: very common, but the right approach (AC- vs DC-coupled, and whether your existing inverter plays nicely) depends on your current equipment. An installer should inspect what you have before quoting.
Step 6 — Cost & financing
Battery pricing depends on capacity, how many units, and backup complexity. The same payment options as solar apply — cash, $0-down loan, or as part of a financed solar-plus-storage package (see financing options). California's incentive landscape changed in 2026, so confirm what applies before assuming a credit — our team will walk you through what's current.
The takeaway
Buy the battery around your goal first, then size both its capacity and power to your real loads, and make sure it's installed by a team that will service it for the next decade. Done right, storage is what turns a modern SoCal solar system from "makes power" into "saves the most money and keeps the lights on." Request a free assessment and we'll model the right setup for your home.