Best Solar Battery for Home 2026
A home battery completes your solar investment. Without storage, you export surplus power at low feed-in rates and buy it back at full retail — often paying 3–5× more. Compare 6 home batteries by chemistry, capacity, cycle life, and price.
Largest Capacity
LG Chem
RESU16H Prime
14.4 kWh usable · NMC
Most Cycles
Sonnen
Eco 10
10,000 cycles · 10-yr warranty
Best Efficiency
BYD
Battery-Box Premium HVS 10.2
97% round-trip efficiency
| Battery | Chemistry | Usable Capacity↓ | Cont. Power↕ | Efficiency↕ | Cycle Life↕ | Warranty↕ | Price↕ |
|---|---|---|---|---|---|---|---|
LG Chem RESU16H Prime | NMC | 14.4 kWh | 7 kW | 91% | 4,000 | 10 yrs | $9,800 |
Tesla Powerwall 3 | LFP | 13.5 kWh | 11.5 kW | 89% | 4,000 | 10 yrs | $11,500 |
Franklin Electric aPower 2 | LFP | 12 kWh | 5 kW | 88% | 6,000 | 12 yrs | $9,200 |
BYD Battery-Box Premium HVS 10.2 | LFP | 10.2 kWh | 5 kW | 97% | 6,000 | 10 yrs | $7,200 |
Sonnen Eco 10 | LFP | 10 kWh | 3.3 kW | 86% | 10,000 | 10 yrs | $13,000 |
Enphase IQ Battery 5P | LFP | 4.96 kWh | 3.84 kW | 89% | 4,000 | 15 yrs | $4,500 |
LFP (Lithium Iron Phosphate)
- ✓ Safer chemistry — does not thermal-runaway
- ✓ Longer cycle life (3,000–6,000+ cycles)
- ✓ Better performance in high temperatures
- ✓ Can be fully discharged without damage
- ✗ Lower energy density — physically larger per kWh
Best for: most residential use cases
NMC (Nickel Manganese Cobalt)
- ✓ Higher energy density — more kWh per volume
- ✓ Better for space-constrained installations
- ✓ Good low-temperature performance
- ✗ Shorter cycle life (typically 2,000–3,000 cycles)
- ✗ Higher risk of thermal runaway if damaged
Best for: space-limited homes, mobile applications
FAQs
How many kWh do I need for overnight battery backup?
A typical US home uses 30 kWh/day. For overnight backup (6pm–8am), you'd need 10–15 kWh of usable capacity. Most home batteries are 10–20 kWh — one battery covers the average home for one night.
Does a home battery qualify for incentives?
As of 2026, the US residential ITC has expired. However, several states offer battery-specific rebates — California's SGIP program offers ~$200/kWh for home batteries. Check our state incentives guide.
What's the difference between capacity and usable capacity?
Total capacity is the battery's full storage. Usable capacity is how much you can actually use — most batteries keep 5–10% in reserve to protect battery chemistry. Always compare usable capacity, not total.