Battery Storage

Backup power.
Peak savings.
Add a battery to your existing solar.

Whether you’re going solar now or you already have panels, a battery gives you control: stay powered during outages, reduce peak-rate costs, and store more of your solar production.

Get an exact quote
Outage backup
Peak shaving
Works with existing solar
BATTERY BENEFITS
Power when it matters.
  • Ride through outages
    Keep essentials running when the grid drops.
  • Use more of your solar
    Store production for night + peak hours.
  • Future-proof upgrades
    EVs, pool pumps, and rising rates—battery helps.
Final sizing depends on your loads, roof/solar production, utility rate plan, and panel/inverter compatibility.
Battery storage and solar home
Existing solar?
YES — YOU CAN ADD A BATTERY.

We can often add storage to many existing systems. We’ll check your inverter type, main panel capacity, and how you want backup configured (whole home vs critical loads).

Add battery to existing solar Request a compatibility check
How it works

Solar + battery, simplified.

Batteries charge from solar (and sometimes the grid), then power your home when needed. The “best” setup depends on what you want backed up and how your utility rates work.

1) Load discovery

We identify the circuits you want backed up: fridge, lights, Wi-Fi, outlets, HVAC, etc.

2) Battery sizing

Based on your daily usage + outage goals. One battery for essentials, two+ for more coverage.

3) Backup design

Critical loads subpanel or whole-home backup (when feasible). We pick the cleanest option.

Add-on installs

Adding a battery to an existing solar system

What we check
  • Inverter compatibility
    String inverter, microinverters, hybrid inverters, and brand-specific requirements.
  • Main panel capacity
    If you need a subpanel, line-side tap, or panel upgrade.
  • Backup goal
    Essentials-only vs larger loads (AC, well pump, EV, etc.).
Common outcomes
Most battery add-ons fall into one of these buckets:
Setup
Best for
Notes
1 battery
Essentials backup
Fridge, lights, outlets, Wi-Fi
2 batteries
More runtime + circuits
Better coverage, more flexibility
2+ batteries
Large loads
May enable partial HVAC / whole-home goals
Check my system
Battery storage and solar home
Benefits

Why battery storage is worth it

Outage protection

Keep critical circuits powered when the grid goes down.

Rate arbitrage

Use stored energy during expensive peak hours.

More self-consumption

Store daytime solar and use it at night.

EV-ready

Helps manage home load as charging increases usage.

FAQ

Battery questions, answered

Can I add a battery if my solar isn’t from Firefly?
Often yes. We’ll verify inverter/monitoring compatibility and your electrical setup.
Do batteries work during an outage if it’s cloudy?
Your battery powers backed-up loads. If your system is configured for backup + solar, solar can recharge the battery when the sun is available.
Is 1 battery enough?
For “essentials backup,” yes for many homes. If you want longer runtime or bigger loads, 2+ is common.
Do I qualify for tax credits?
In many cases, storage qualifies when installed with solar. Eligibility depends on your tax situation and current rules. We can explain what typically applies.
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