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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuotePower your entire home during outages. 20-40 kWh capacity, $20,000-$40,000 installed.
2-3 Tesla Powerwall 3 or equivalent.
Whole-Home Backup
$20,000-$40,000
Before incentives
20-40 kWh
2-3 Tesla Powerwall 3
12-24+ hours
Essential loads
Program
Grid Resilience
$20,000
From (installed)
A whole-home battery backup system provides enough storage to power all your circuits including HVAC, kitchen appliances, and lighting during grid outages.
For Houston homeowners served by CenterPoint Energy (Houston) at $0.14/kWh, a whole-home backup system (20-40 kWh) stores enough energy to cover your entire home for 12-24+ hours during a grid outage.Texas averages 48 hours of outages per year.
System example: 2-3 Tesla Powerwall 3 or equivalent. Installed cost: $20,000-$40,000 before incentives.
Ideal For
Pros
Cons
Expired December 31, 2025. Homeowners purchasing batteries with cash or a loan receive $0 federal tax credit.
Texas has no state battery rebate but batteries are essential for grid resilience.
Compare what you can run during a grid outage with each battery tier.
| Appliance | Whole-Home | Partial-Home | Critical-Load |
|---|---|---|---|
| Central AC/Heat | |||
| Oven/Range | |||
| Clothes Dryer | |||
| EV Charger | |||
| Mini-Split | |||
| Sump Pump | |||
| Refrigerator | |||
| LED Lighting | |||
| Internet/Wi-Fi | |||
| Phone Charging |
NuWatt installs these systems for whole-home backup in Houston.