Whole-Home Battery Backup Systems

What Is Whole-Home Battery Backup?

Power your entire home during outages without generators

Whole-home battery backup uses lithium battery storage and an intelligent inverter to power your entire electrical panel during an outage. When utility power fails, the system switches automatically no cords, no refueling, no noise.

These systems can operate:

With existing solar
With new solar
Without solar (battery-only backup)

What a Whole-Home System Can Power

Every system is engineered around your actual electrical loads.

Commonly Supported Loads:

Central air conditioning & mini-splits (properly sized)
Refrigerators & freezers
Lights & outlets
Internet, TVs, security systems
Well pumps (case-by-case)
Garages & EV chargers (case-by-case)

⚠️ Runtime depends on battery capacity, load size, and solar availability.

Whole-Home vs Critical-Loads Backup

Whole-Home Backup

Entire main panel backed up
Higher battery capacity
Seamless experience during outages

Critical-Loads Backup

Selected circuits only
Lower cost
Shorter runtime

System Types We Install

🔋 Battery-Only Backup

Backup power without solar
Ideal for outage protection
Can be expanded later

☀️ Solar + Battery Backup

Recharge batteries during the day
Longer outages covered
Reduced grid dependence

⚡ Hybrid Backup Systems

Solar + battery + generator (optional)
Maximum reliability

Why Homeowners Choose Sundown Solar

✔ Custom system design no cookie-cutter kits

✔ Honest load calculations

✔ Clean, code-compliant installs

✔ Generator-ready designs

✔ Local Texas support

✔ Long-term service & maintenance available

We design systems to work when it matters most.

How the Process Works

1.Consultation –

Review your home, panel, and outage goals

2.Load Analysis –

Determine true power requirements

3.System Design –

Battery capacity, inverter sizing, layout

4.Installation –

Professional install & commissioning

5.Training & Support –

You know how it works before we leave