Device Comparison
BYD Battery-Box Premium HVL US vs Tesla Powerwall 3 vs FranklinWH aPower 2
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Use this comparison when the shortlist is down to premium residential battery platforms and the main question is which ecosystem offers the right mix of backup, expansion, and installer support.
| Install fit | |||
|---|---|---|---|
| Phase support | Depends on paired inverter; used in North American residential battery systems | North American split-phase residential systems; regional variants differ | Residential whole-home backup system context via FranklinWH system components |
| Installation | Wall-mounted modular high-voltage battery tower | 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 | Battery storage telemetry through compatible inverter/BMS, not an inline energy meter | 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 | 50 A | 48 A | Unknown |
| Inverter fit | |||
| Backup support | Unknown | Unknown | Designed for whole-home backup within the FranklinWH system, with backup behavior coordinated through aGate and system design choices. |
| Battery fit | |||
| Nominal capacity | Unknown | 13.5 kWh | 15 kWh |
| Usable capacity | Unknown | Unknown | 15 kWh |
| Chemistry | Lithium iron phosphate (LiFePO4) | Unknown | Lithium iron phosphate (LFP) |
| Charge/discharge power | Unknown | Unknown | 10 kW |
| Warranty | 10 years | 10 years | 15 years |
| Expansion | 12-32 kWh per tower; up to 96 kWh maximum system capacity | 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 | Unknown | Tesla App / Wi-Fi / Ethernet / Cellular | FranklinWH App / aGate |
| Local API | No | Yes | No |
| Cloud dependency | Depends on paired inverter monitoring platform; battery itself is not a homeowner local-API device. | 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 | No | Yes | No |
| Solar fit | |||
| Solar import/export | Yes | Yes | Yes |
| Buying context | |||
| Price range | Installer supplied; typically quoted as part of a battery system | Installer supplied; usually quoted as a complete installed system | Unknown |
| Availability | North America | United States and Canada | United States / Canada official FranklinWH availability |
| Source check | |||
| Last verified | May 18, 2026 | May 19, 2026 | May 21, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Unknown | Official docs |
Verdict
Choose the battery that best matches the inverter and energy-management ecosystem you want to live with, with Tesla strongest for integrated household appeal and FranklinWH or BYD fitting more installer-led system decisions.