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Solar Battery Storage - Compare Home Battery Systems

A solar battery lets you store excess solar energy for use at night or during grid outages. Here's how the top residential systems compare on capacity, cost, efficiency, and warranty.

Battery Comparison Table

Brand / ModelCapacityPowerEfficiencyWarrantyAvg CostMarket Share
Tesla Powerwall 3
LFP
13.5 kWh11.5 kW97.5%10 yr$12,00038%
Enphase IQ Battery 5P
LFP
5 kWh3.84 kW96%15 yr$5,50022%
SolarEdge Home Battery 48V
NMC
9.7 kWh5 kW94.5%10 yr$9,00014%
LG RESU16H Prime
NMC
16 kWh7 kW95%10 yr$11,00010%
Generac PWRcell
NMC
9 kWh9 kW96.5%10 yr$10,0009%

Market share estimates based on US residential battery installations, 2024. Costs are average installed prices; actual quotes vary.

Detailed Battery Reviews

Tesla

Powerwall 3

38% share

Capacity

13.5 kWh

Power

11.5 kW

Warranty

10 yr

The most popular home battery in the US. Integrates natively with Tesla Solar and third-party solar systems.

Top Pros

  • High power output (11.5kW)
  • Native solar + EV integration
Avg installed$11,000–$16,000
Full Review & Specs

Enphase

IQ Battery 5P

22% share

Capacity

5 kWh

Power

3.84 kW

Warranty

15 yr

Modular microinverter-based battery. Stack multiple units for more capacity. Best paired with Enphase solar systems.

Top Pros

  • 15-year warranty (longest in category)
  • Highly modular — add units as needed
Avg installed$5,000–$8,000 per unit
Full Review & Specs

SolarEdge

Home Battery 48V

14% share

Capacity

9.7 kWh

Power

5 kW

Warranty

10 yr

Integrated battery for SolarEdge systems. Tight integration with SolarEdge inverters provides smart energy management.

Top Pros

  • Seamless SolarEdge inverter integration
  • Smart energy management via SolarEdge app
Avg installed$8,000–$12,000
Full Review & Specs

LG

RESU16H Prime

10% share

Capacity

16 kWh

Power

7 kW

Warranty

10 yr

High capacity single-unit battery from LG Chem. Good choice for homes with high energy usage.

Top Pros

  • Large 16 kWh capacity in single unit
  • Compatible with most inverter brands
Avg installed$10,000–$14,000
Full Review & Specs

Generac

PWRcell

9% share

Capacity

9 kWh

Power

9 kW

Warranty

10 yr

Modular battery system with high power output. Good for whole-home backup and off-grid capability.

Top Pros

  • High 9kW power output
  • Modular design (add batteries)
Avg installed$9,000–$14,000
Full Review & Specs

Do You Need a Solar Battery?

Yes - Consider a Battery

  • •You have frequent power outages or unreliable grid service
  • •You're in California under NEM 3.0 (export rates reduced to ~$0.05/kWh)
  • •Your utility has high time-of-use rates (peak vs. off-peak)
  • •You have medical equipment requiring uninterrupted power

Maybe - Evaluate Your Situation

  • •You want greater energy independence from utilities
  • •You drive an electric vehicle and charge at home overnight
  • •You're in a state where net metering credits are being reduced
  • •You have a home office or work from home and need reliability

Not Urgently

  • •You have simple full-retail net metering (1:1 credit)
  • •Your electricity rates are low (under 12¢/kWh)
  • •Your grid is reliable with infrequent outages
  • •Your primary goal is maximum ROI, not backup power

Batteries Now Qualify for the 30% Federal Tax Credit

Under the Inflation Reduction Act (2022), standalone battery storage systems now qualify for the 30% ITC through 2032, even without solar panels installed at the same time - as long as the battery is charged exclusively by solar. On a $12,000 Powerwall installation, that's a $3,600 credit. Calculate your savings →

Frequently Asked Questions

Home solar batteries typically cost $5,000-$16,000 installed depending on the brand, capacity, and your installer. The Tesla Powerwall 3 (13.5 kWh) averages around $12,000 installed. Smaller modular options like the Enphase IQ Battery 5P start around $5,500 per unit. The 30% federal ITC applies to batteries paired with solar, reducing net costs significantly.
For whole-home backup, the Tesla Powerwall 3 (11.5 kW output) handles the most simultaneous loads. For modular scalability, Enphase IQ Battery 5P offers the best flexibility and the longest warranty (15 years). For homes already using SolarEdge inverters, the SolarEdge Home Battery offers the tightest integration. The "best" battery depends on your existing solar system, backup needs, and budget.
Yes. As of 2023 under the Inflation Reduction Act, standalone battery storage qualifies for the 30% ITC when installed with a solar system, or as a standalone system if charged exclusively by solar (not the grid). This applies through 2032, then steps down to 26% in 2033 and 22% in 2034. File IRS Form 5695 with your federal return.
Most home batteries are warranted for 10 years (Tesla, SolarEdge, LG, Generac) with Enphase offering 15 years. Lithium Iron Phosphate (LFP) batteries like Tesla Powerwall and Enphase IQ typically last 12-15+ years in practice. NMC batteries (SolarEdge, LG, Generac) may have slightly shorter real-world lifespans. Warranty throughput guarantees (measured in kWh cycled) are the most meaningful metric.
You do not need a battery to go solar. Most solar homeowners are grid-tied with net metering and rely on the grid at night. A battery is most valuable if you have frequent power outages, live in California under NEM 3.0 (export rates reduced), have high time-of-use electricity rates, or want energy independence. In states with strong net metering, a battery adds cost without proportional savings.
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Data sources: LBNL Tracking the Sun • Wood Mackenzie US Solar Market Insight • Manufacturer published specifications • EnergySage Market Data