Home Battery System GuideThe LG RESU16H Prime and Tesla Powerwall 3 are two compact, high-capacity single-unit home batteries. This comparison lists only published figures so the numbers read directly rather than through a ranking.
How to read this comparison
Every figure below comes from a named source: LG's EnergySage specification page and Tesla's datasheet. Capacity in kilowatt-hours sets runtime, and continuous power in kilowatts sets simultaneous load. Watch efficiency wording, since roundtrip and solar-to-grid are different measurements.
Both are single integrated units rather than small stackable modules, which makes a per-unit comparison meaningful.
No winner is declared. The right choice depends on target size, solar integration, and installer support.
LG RESU16H Prime, from LG's specs
EnergySage lists the LG RESU16H Prime at 16 kWh of usable capacity with 7 kW continuous power and an 11 kW peak rating. It uses lithium-ion chemistry.
The RESU16H Prime lists a roundtrip efficiency of 90% and a 10-year warranty.
Tesla Powerwall 3, from Tesla's specs
Tesla rates the Powerwall 3 at 13.5 kWh of nominal battery energy with up to 11.5 kW AC continuous power. It integrates a solar inverter and supports up to 20 kW DC of solar.
Tesla lists 97.5% solar-to-grid efficiency for the Powerwall 3 and a 10-year warranty.
Where they differ on paper
On single-unit capacity the RESU16H Prime lists 16 kWh versus the Powerwall 3's 13.5 kWh. On continuous power the Powerwall 3 lists up to 11.5 kW versus the RESU's 7 kW, though the RESU lists an 11 kW peak.
Efficiency figures are stated on different bases. LG lists 90% roundtrip, while Tesla lists 97.5% solar-to-grid; these are not a like-for-like measurement. The Powerwall 3 also integrates a solar inverter with direct solar inputs, while the RESU is a compact DC-coupled battery.
Warranty is 10 years for both. Which fits depends on target capacity, whether a solar inverter is needed, and installer support.