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Tesla Powerwall 3 vs LG RESU Prime vs Generac PWRcell vs Enphase IQ Battery 5P. We compare specs, pricing, warranties, and real-world performance to help you pick the right battery for your home.
4
Products Compared
$6K-18K
Price Range
97.5%
Best Efficiency
15 Years
Best Warranty
The Tesla Powerwall 3 is the best all-around home battery for 2026. Its 97.5% efficiency, integrated inverter, and ConnectedSolutions compatibility make it the top choice for most homeowners. If you use Enphase microinverters, the Enphase IQ Battery 5P offers seamless integration and a 15-year warranty. For whole-home backup with heavy loads, the Generac PWRcell delivers the highest continuous power at 9 kW. The LG RESU Prime offers the most capacity per dollar at 16 kWh per unit.
All four batteries compared across the specs that matter most for homeowners: capacity, power output, efficiency, warranty, and cost.
| Spec | Tesla PowerwallBest All-Around | LG RESUBest Capacity / Dollar | Generac PWRcellBest for Whole-Home Backup | Enphase IQBest for Solar Self-Consumption |
|---|---|---|---|---|
| Usable Capacity | 13.5 kWh | 16 kWh | 9-18 kWh | 5 kWh/unit |
| Continuous Power | 5 kW | 7 kW | 9 kW | 3.84 kW/unit |
| Peak Power | 11.5 kW | 11 kW | 12 kW | 7.68 kW/unit |
| Round-Trip Efficiency | 97.5% | 94.5% | 96.5% | 96% |
| Warranty | 10 yr / 70% | 10 yr / 60% | 10 yr / 70% | 15 yr / 70% |
| Integrated Inverter | Yes | No | Yes | Yes (micro) |
| Price (installed) | $8.5-12K | $9-13K | $10-18K | $6-8K each |
| Cost per kWh | $630-$890 | $563-$813 | $556-$1,000 | $1,200-$1,600 |
| ConnectedSolutions | Yes | Limited | Limited | Yes |
| Max Scalability | 54 kWh (4) | 32 kWh (2) | 18 kWh (1) | Unlimited |
| Chemistry | LFP | NMC | NMC | LFP |
Capacity
13.5 kWh
Continuous
5 kW
Efficiency
97.5%
Price
$8,500 - $12,000
Warranty
10 yr / 70%
Capacity
16 kWh
Continuous
7 kW
Efficiency
94.5%
Price
$9,000 - $13,000
Warranty
10 yr / 60%
Capacity
9-18 kWh
Continuous
9 kW
Efficiency
96.5%
Price
$10,000 - $18,000
Warranty
10 yr / 70%
Capacity
5 kWh per unit
Continuous
3.84 kW per unit
Efficiency
96%
Price
$6,000 - $8,000 each
Warranty
15 yr / 70%
The "best" battery depends on your priorities. Here is our recommendation for each common use case.
Best All-Around
Highest efficiency, integrated inverter, excellent app, and ConnectedSolutions compatible. The most well-rounded option for most homeowners.
Best for Whole-Home Backup
9 kW continuous power handles heavy loads like central AC, well pumps, and electric ranges simultaneously. Best for homes that need everything running during an outage.
Best for Solar Self-Consumption
Seamless integration with Enphase microinverters, modular scalability, and the longest warranty at 15 years. Start small and add units as your needs grow.
Best Capacity per Dollar
16 kWh in a single compact unit with 7 kW continuous power. Lowest cost per kWh of storage, making it ideal for homeowners who want maximum capacity on a budget.
With the federal residential tax credit (Section 25D) expired, state-level programs are the primary way to offset battery costs. Here is what is available in NuWatt's 9 service states.
| State | Battery Incentive | DR Program |
|---|---|---|
| Massachusetts | ConnectedSolutions: $225-275/kW/yr | Yes |
| Connecticut | ConnectedSolutions: $275/kW summer | Yes |
| Rhode Island | ConnectedSolutions: $225/kW summer | Yes |
| Vermont | GMP Battery Program: varies by utility | Yes |
| New Hampshire | No state battery incentive | No |
| Maine | No state battery incentive | No |
| New Jersey | No state battery incentive | No |
| Pennsylvania | No state battery incentive | No |
| Texas | No state battery incentive | No |
Section 25D residential clean energy credit expired December 31, 2025. No federal tax credit exists for standalone residential battery purchases in 2026. Third-party ownership structures (leases/PPAs) may still access commercial Section 48/48E ITC through the financing company.
Peak power handles short surges (AC compressor starting). Continuous power is what the battery delivers steady-state. A 5 kW continuous battery cannot run a 3.5 kW AC and a 5 kW dryer simultaneously. If you need whole-home backup for heavy loads, prioritize continuous power (Generac at 9 kW leads this category).
A battery with 97.5% efficiency (Powerwall 3) retains 97.5 cents of every dollar of energy stored. At 94.5% (LG RESU Prime), you lose an extra 3 cents per cycle. Over 10 years of daily cycling, that 3% gap adds up to hundreds of dollars in lost energy. For homes that cycle their battery daily (TOU optimization, solar self-consumption), efficiency is a top priority.
A 10-year warranty means nothing if the capacity guarantee is only 60% (LG RESU Prime). That means your 16 kWh battery could legally degrade to 9.6 kWh by year 10 without triggering a warranty claim. Tesla and Generac guarantee 70%, and Enphase guarantees 70% over a longer 15-year term. Enphase offers the best overall warranty protection.
In MA, CT, RI, and VT, ConnectedSolutions pays $1,350-$1,950 per year for a single battery. Over 10 years, that is $13,500-$19,500 in revenue. Against an $8,500-$12,000 Powerwall cost, that is a positive ROI from demand response alone. If you live in a ConnectedSolutions state, a battery is one of the best financial investments you can make for your home.
We install all four batteries featured in this comparison. Get transparent pricing, ConnectedSolutions enrollment, and expert sizing for your home. Serving MA, CT, RI, NH, ME, VT, NJ, PA, and TX.