Solar Panel System GuideTesla and FranklinWH both make home batteries but with different capacities, power ratings, and warranty structures. This page compares their documented numbers and declares no winner.
How to read this comparison
Every figure below is quoted from the manufacturer datasheet for a specific model. Efficiency and wattage are stated at standard test conditions, the same lab benchmark for both, so the numbers compare like for like. Warranty terms are worth reading closely because manufacturers split product and performance coverage differently. Numbers change as manufacturers release new model years, so always confirm against the current datasheet for the exact model a quote lists.
Tesla Powerwall 3 (from the Tesla product page)
Tesla lists the Powerwall 3 with an energy capacity of 13.5 kWh and an integrated solar inverter. It delivers 11.5 kW of continuous on-grid power and 11.5 kW of continuous backup power.
On warranty, Tesla covers the Powerwall 3 with a 10 year warranty.
FranklinWH aPower 2 (from the FranklinWH datasheet)
FranklinWH lists the aPower 2 with 15 kWh of usable AC energy per unit and lithium iron phosphate cells. It delivers a maximum of 10 kW continuous power and a 15 kW peak for 10 seconds, and it is AC coupled.
On warranty, FranklinWH lists a 15 year or 60 MWh throughput warranty, whichever comes first, with a round trip efficiency of 90 percent.
Where they differ on paper
On capacity, FranklinWH lists 15 kWh per unit against Tesla's 13.5 kWh. On continuous power the order flips, with Tesla listing 11.5 kW against the FranklinWH 10 kW.
On architecture, Tesla lists an integrated solar inverter inside the Powerwall 3 while FranklinWH lists an AC coupled design that pairs with an existing inverter. On warranty, Tesla lists a 10 year term while FranklinWH lists 15 years or 60 MWh of throughput. These are the documented figures, not a verdict.