I think you could check out Enphase Encharge. This is based on anecdotes here on TMC and my having seen two Encharge systems deployed in homes near me. The Encharge 10 has similar functionality of the core Powerwall features.
Where they differ seems more on the control/software side. Tesla recently deployed advanced features are better than Enphase. But if you're a loser like me with no access to the Tesla Powerwall advanced features... then my Powerwall system is almost operationally identical to an Enphase system.
You can also ping users
@sunwarriors and
@lavalamp425 about their Enphase systems.
Here are some other home ESS options (my list may be outdated).
Enphase Encharge 10T is 3.84 kW, 9.7 kWh
Fortress eVault (Sol Ark 12k) is 8.9 kW, 17.8 kWh (and comes with casters do you can wheel it around!)
Generac PWRCell IR/OR M6 is 6.7 kW and 17.3 kWh
LG Chem StorEdge 7600A is 4.6 kW and 16.8 kWh
POMCube PNZ is 12.5 kW and 18.5 kWh
Sonnen EcoLinx gen 1.5 is 7 kW and 18.5 kWh
SunPower SunVault 26 is 6 kW and 22.9 kWh