Device Comparison
Tesla Powerwall 3 vs FranklinWH aPower 2
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At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
Tesla Powerwall 3
- Nominal capacity
- 13.5 kWh
- Expansion
- System expansion available anytime; each Powerwall 3 Expansion adds 13.5 kWh, with up to 40.5 kWh max expansion per unit and up to 3 expansion units supported
- Warranty
- 10 years
- Price
- Installer supplied; usually quoted as a complete installed system
FranklinWH aPower 2
- Usable capacity
- 15 kWh
- Nominal capacity
- 15 kWh
- Chemistry
- Lithium iron phosphate (LFP)
- Charge/discharge
- 10 kW
| Install fit | ||
|---|---|---|
| Phase support | North American split-phase residential systems; regional variants differ | Residential whole-home backup system context via FranklinWH system components |
| Installation | Integrated inverter home battery for wall- or floor-mounted indoor or outdoor installation | Wall- or floor-mounted indoor/outdoor AC-coupled battery installed as part of a FranklinWH aGate system |
| Measurement | Home battery storage system with integrated solar inverter, whole-home or partial-home backup support, and Tesla app monitoring | AC-coupled home battery with integrated inverter for storing solar, grid, generator, and EV-related household energy within the FranklinWH ecosystem |
| Max current | 48 A | Unknown |
| Inverter fit | ||
| Backup support | Unknown | Designed for whole-home backup within the FranklinWH system, with backup behavior coordinated through aGate and system design choices. |
| Battery fit | ||
| Nominal capacity | 13.5 kWh | 15 kWh |
| Usable capacity | Unknown | 15 kWh |
| Chemistry | Unknown | Lithium iron phosphate (LFP) |
| Charge/discharge power | Unknown | 10 kW |
| Warranty | 10 years | 15 years |
| Expansion | System expansion available anytime; each Powerwall 3 Expansion adds 13.5 kWh, with up to 40.5 kWh max expansion per unit and up to 3 expansion units supported | Supports parallel AC-coupled expansion up to 15 aPower batteries per aGate for 225 kWh total usable system energy |
| Monitoring | ||
| Protocol | Tesla App / Wi-Fi / Ethernet / Cellular | FranklinWH App / aGate |
| Local API | Yes | No |
| Cloud dependency | Tesla App and installer tools are central; local and third-party access varies by firmware and region. | Backup power can continue offline, but FranklinWH App remote monitoring and updates depend on internet-connected aGate service. |
| Home Assistant | Yes | No |
| Solar fit | ||
| Solar import/export | Yes | Yes |
| Buying context | ||
| Price range | Installer supplied; usually quoted as a complete installed system | Unknown |
| Availability | United States and Canada | United States / Canada official FranklinWH availability |
| Source check | ||
| Last verified | May 19, 2026 | May 21, 2026 |
| Product page | Official page | Official page |
| Documentation | Unknown | Official docs |