Home Battery Overview
The battery market has exploded since I started tracking it. Tesla Powerwall dominated early (and still has name recognition), but Enphase and Franklin have become serious contenders. What excites me most? Battery costs have dropped roughly 50% since 2020. We're finally reaching the point where storage makes economic sense for many homeowners, not just early adopters. The next few years are going to be really interesting.
Home batteries store excess solar energy for use when the sun isn't shining. They provide backup power during outages and can optimize electricity costs with time-of-use rates. The market has matured significantly, with several strong options now available.
Source: NREL Grid Energy Storage Report 2025; EnergySage Battery Data
Top Battery Brands
| Brand | Product | Capacity | Notable Features |
|---|---|---|---|
| Tesla | Powerwall 3 | 13.5 kWh | Integrated inverter, brand recognition |
| Enphase | IQ Battery 5P | 5 kWh (stackable) | Modular, integrates with Enphase systems |
| Franklin | WholePower | 13.6 kWh | Whole-home backup, high power output |
| SolarEdge | Home Battery | 9.7 kWh | SolarEdge ecosystem integration |
| Generac | PWRcell | 9-18 kWh | Generator integration, modular |
| LG | RESU Prime | 16 kWh | High capacity, compact |
Detailed Brand Comparison
Tesla Powerwall 3
- Capacity: 13.5 kWh usable
- Power output: 11.5 kW continuous
- Warranty: 10 years
- Price: ~$10,000-13,000 installed
- Best for: Brand recognition, Tesla ecosystem
Enphase IQ Battery 5P
- Capacity: 5 kWh per unit (stack up to 4)
- Power output: 3.84 kW per unit
- Warranty: 15 years
- Price: ~$6,000-8,000 per unit installed
- Best for: Enphase microinverter systems, modular growth
Franklin WholePower
- Capacity: 13.6 kWh
- Power output: 10 kW continuous
- Warranty: 12 years
- Price: ~$12,000-15,000 installed
- Best for: Whole-home backup, high power needs
Comparison Table
| Feature | Powerwall 3 | Enphase 5P | Franklin |
|---|---|---|---|
| Capacity | 13.5 kWh | 5 kWh (×4) | 13.6 kWh |
| Power (Continuous) | 11.5 kW | 3.84 kW (×4) | 10 kW |
| Warranty | 10 years | 15 years | 12 years |
| Scalable | Yes (4 max) | Yes (modular) | Yes (3 max) |
| Round-trip efficiency | ~90% | ~89% | ~90% |
Sizing & Selection Tips
How Much Battery Do You Need?
| Use Case | Recommended Size |
|---|---|
| Essential loads backup | 10-15 kWh |
| Whole-home backup (small home) | 15-20 kWh |
| Whole-home backup (large home) | 25-40 kWh |
| TOU optimization only | 10-15 kWh |
| Off-grid capable | 40+ kWh |
Selection Criteria
- Inverter compatibility: Match with your solar inverter brand
- Power output: Can it handle your loads simultaneously?
- Capacity: How long do you need backup power?
- Warranty: Enphase leads with 15 years
- Installer experience: Choose installer-supported brands
The Bottom Line
All major battery brands are solid choices in 2026. Tesla Powerwall offers brand recognition and good performance. Enphase is ideal if you have Enphase microinverters and want the longest warranty. Franklin excels at whole-home backup with high power output. The "best" battery depends on your inverter choice, backup needs, and installer expertise.
Questions About Batteries?
Our AI can help you understand which battery is best for your needs.
Ask About Batteries