Tesla Powerwall 2 vs LG Energy Solution RESU 10H
The Tesla Powerwall 2 wins this battery comparison by a decisive margin. It delivers 13.5 kWh of usable storage with 5 kW continuous output and a 5,000-cycle rating. The 4.2 kWh capacity advantage provides 6 additional hours of essential-load backup.
Key Differences
- • Tesla Powerwall 2 provides 13.5 kWh vs 9.3 kWh usable capacity.
- • LG Energy Solution RESU 10H achieves 94.5% round-trip efficiency vs 90%.
- • Tesla Powerwall 2 is rated for 5,000 cycles vs 4,000.
Specifications Breakdown
Usable Storage Capacity
The Tesla Powerwall 2 provides 13.5 kWh of usable capacity (14 kWh total, 100% DoD), while the LG Energy Solution RESU 10H offers 9.3 kWh usable (9.8 kWh total, 95% DoD). At an average essential-load consumption rate of 750 watts, the Tesla Powerwall 2 provides approximately 18.0 hours of backup versus 12.4 hours for the LG Energy Solution RESU 10H. The Tesla Powerwall 2's 4.2 kWh capacity advantage translates to roughly 6 additional hours of essential-load backup during a grid outage. The Tesla Powerwall 2 is scalable up to 10 units (135 kWh total), while the LG Energy Solution RESU 10H scales up to 2 units (19 kWh total).
Power Output
The Tesla Powerwall 2 delivers 5 kW continuous and 7 kW peak power, while the LG Energy Solution RESU 10H provides 5 kW continuous and 7 kW peak. Matched power output means both can run the same combination of appliances simultaneously. Peak power rating matters for motor-driven loads with high startup current, such as air conditioners, well pumps, and sump pumps. The LG Energy Solution RESU 10H's 7 kW peak is suitable for lighter startup loads.
Battery Chemistry & Cycle Life
The Tesla Powerwall 2 uses NMC chemistry with a rated cycle life of 5,000 cycles (approximately 13.7 years of daily cycling), while the LG Energy Solution RESU 10H uses NMC with 4,000 cycles (approximately 11.0 years). Both use NMC chemistry, which delivers higher energy density at the trade-off of shorter cycle life compared to LFP alternatives. The Tesla Powerwall 2's additional 1,000 cycles translates to approximately 2.7 more years of daily use before reaching the rated end of life.
Round-Trip Efficiency
The Tesla Powerwall 2 achieves 90% round-trip efficiency versus 94.5% for the LG Energy Solution RESU 10H. This means for every 10 kWh of solar energy stored in the LG Energy Solution RESU 10H, 9.4 kWh is recoverable, compared to 9.0 kWh for the other. Over 10 years of daily cycling with 15 kWh average daily throughput, the more efficient battery saves approximately $370 in energy that would otherwise be lost as heat (at $0.15/kWh average retail rate). Higher round-trip efficiency is especially valuable in time-of-use rate environments where you are storing cheap off-peak energy for expensive peak-hour consumption.
Warranty & Long-Term Protection
The Tesla Powerwall 2 carries a 10-year warranty and 37.8 MWh throughput, while the LG Energy Solution RESU 10H offers 10 years and 22.4 MWh throughput. Both offer identical warranty duration. Battery warranties typically guarantee the unit will retain 60-70% of original capacity by end of warranty, so the length of coverage directly impacts your financial risk over the system's lifetime.
Specification Comparison
| Specification | Tesla Powerwall 2 | LG Energy Solution RESU 10H |
|---|---|---|
| Capacity | 14 kWh | 9.8 kWh |
| Usable Capacity | 13.5 kWh | 9.3 kWh |
| Power Output | 5 kW | 5 kW |
| Chemistry | NMC (Nickel Manganese Cobalt) | NMC (Nickel Manganese Cobalt) |
| Efficiency | 90% | 94.5% |
| Cycle Life | 5,000 | 4,000 |
| Weight | 114 kg | 75 kg |
| Warranty | 10 years | 10 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: Tesla Powerwall 2The Tesla Powerwall 2 provides 13.5 kWh versus 9.3 kWh — 4.2 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 6 additional hours of backup power. This is a substantial capacity gap.
2. Power Output
Winner: TieBoth deliver 5 kW continuous output — identical ability to power household loads simultaneously.
3. Chemistry & Longevity
Winner: Tesla Powerwall 2Both use NMC chemistry with Tesla Powerwall 2 at 5,000 cycles vs LG Energy Solution RESU 10H at 4,000 cycles. NMC chemistry offers higher energy density in a smaller package at the cost of shorter cycle life.
4. Round-Trip Efficiency
Winner: LG Energy Solution RESU 10HThe LG Energy Solution RESU 10H achieves 94.5% round-trip efficiency versus 90%. Over 10 years of daily cycling with 15 kWh throughput per day, the more efficient battery saves approximately 370 dollars in energy that would otherwise be lost as heat (at $0.15/kWh). The difference is moderate but compounds over the battery's lifespan.
5. Warranty Coverage
Winner: TieBoth carry 10-year warranties — equal long-term manufacturer protection.
Tesla Powerwall 2
The Tesla Powerwall 2 was discontinued in November 2025 after nearly a decade as the world's most popular home battery. First released in 2016, it established Tesla as the leader in residential energy storage with over a million units installed globally (including Powerwall+). It uses NMC chemistry with liquid cooling and delivers 5 kW continuous power (5.8 kW on late models produced after November 2020, with 10 kW peak). As an AC-coupled system, it retrofits easily onto existing solar installations without replacing the inverter. Up to ten units can be stacked for 135 kWh / 50 kW systems. Tesla continues to honor the 10-year / 37.8 MWh throughput warranty for existing units. For new installations, the Powerwall 3 is the recommended replacement.
Pros
- + Proven reliability with over a million global installations since 2016
- + AC-coupled design retrofits with any existing solar inverter brand
- + Supports up to 10 units for 135 kWh / 50 kW system capacity
- + Tesla continues full warranty support and software updates for existing units
Cons
- - Discontinued November 2025 — no longer available for new installations
- - Lower 5 kW continuous power output compared to Powerwall 3's 11.5 kW
- - NMC chemistry has shorter cycle life than newer LFP alternatives
- - Late-model power improvements (5.8 kW / 10 kW peak) not available on early units
LG Energy Solution RESU 10H
The LG RESU 10H is one of the most widely deployed residential batteries globally, using NMC chemistry in a compact high-voltage package. At just 75 kg, it is one of the lightest 10 kWh-class batteries available, making installation straightforward. The 400V high-voltage DC platform pairs efficiently with popular hybrid inverters from SolarEdge, SMA, and Fronius. While it uses older NMC chemistry compared to the newer LFP-based Prime series, the RESU 10H remains a proven, reliable option with extensive real-world track record across hundreds of thousands of installations.
Pros
- + Compact and lightweight at 75 kg for easy two-person installation
- + Extensive compatibility with major hybrid inverter brands
- + Proven track record with hundreds of thousands of global installations
- + 94.5% round-trip efficiency with high-voltage DC-coupled design
Cons
- - NMC chemistry has lower cycle life compared to newer LFP alternatives
- - 95% depth of discharge leaves some capacity unusable
- - Being superseded by the newer RESU Prime LFP series
Choose Tesla Powerwall 2 If...
- ✓ You need more backup storage to cover overnight consumption or extended outages
- ✓ Maximum battery longevity (5,000 cycles) is your top priority
- ✓ You want the flexibility to expand storage capacity over time (up to 10 units)
- ✓ No longer available for new installations. Existing Powerwall 2 owners should continue using their units under warranty. For new battery storage, see the Tesla Powerwall 3.
Choose LG Energy Solution RESU 10H If...
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ Homeowners seeking a proven, lightweight battery with broad inverter compatibility for standard residential backup
Our Recommendation
The Tesla Powerwall 2 is the decisive winner in this battery comparison, outperforming the LG Energy Solution RESU 10H in 2 of 5 dimensions. Unless you have a specific requirement that the LG Energy Solution RESU 10H uniquely addresses, the Tesla Powerwall 2 is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Tesla Powerwall 2 or LG Energy Solution RESU 10H?
The Tesla Powerwall 2 wins this battery comparison by a decisive margin. It delivers 13.5 kWh of usable storage with 5 kW continuous output and a 5,000-cycle rating. The 4.2 kWh capacity advantage provides 6 additional hours of essential-load backup.
Which battery lasts longer?
The Tesla Powerwall 2 is rated for 5,000 cycles versus 4,000 for the LG Energy Solution RESU 10H. Tesla Powerwall 2 lasts approximately 3 more years of daily cycling.
Which battery provides more backup power?
The Tesla Powerwall 2 provides 5 kW continuous (7 kW peak) versus 5 kW continuous (7 kW peak) for the LG Energy Solution RESU 10H. Both deliver identical continuous power. A central AC typically needs 3-5 kW, a refrigerator 0.2 kW, and an EV charger 7-11 kW.
Can I expand Tesla Powerwall 2 or LG Energy Solution RESU 10H storage later?
Tesla Powerwall 2: Yes, up to 10 units for 135 kWh total. LG Energy Solution RESU 10H: Yes, up to 2 units for 19 kWh total. Tesla Powerwall 2 offers more expansion potential.
Which battery chemistry is safer?
Both use NMC chemistry with appropriate thermal management systems and UL 9540 safety certification.
Related Resources
Last updated: February 2026