Device Comparison
BYD Battery-Box Premium HVL US vs Tesla Powerwall 3 vs FranklinWH aPower 2
A premium home battery comparison for buyers balancing installer ecosystem, backup expectations, and whole-home energy control.
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Which To Choose
Start with the practical fit, then read the table.
BYD Battery-Box Premium HVL US
Best fit when backup needs like backup and off-grid capable with a compatible high-voltage battery inverter and system design., future expansion, and 10-year warranty coverage.
Tesla Powerwall 3
Best fit when about 13.5 kWh usable storage, backup needs like seamless whole-home or partial-home backup is a core supported use case; Tesla's current support documentation says non-backup configuration is not supported for Powerwall 3., and future expansion.
FranklinWH aPower 2
Best fit when about 15 kWh usable storage, backup needs like whole-home backup / Emergency Backup when installed as a compatible FranklinWH system with aGate., and future expansion.
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.
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.
BYD Battery-Box Premium HVL US
- Chemistry
- Lithium iron phosphate (LFP), cobalt-free
- Expansion
- 12-32 kWh usable per HVL tower; up to 96 kWh with 3 identical towers in parallel, subject to compatible inverter/system design
- Warranty
- 10 years
- Price
- Installer supplied; typically quoted as part of a battery system
Tesla Powerwall 3
- Usable capacity
- 13.5 kWh
- Nominal capacity
- 13.5 kWh
- Chemistry
- Lithium-ion; subtype not specified in reviewed public Tesla Powerwall 3 sources.
- Charge/discharge
- 11.5 kW
FranklinWH aPower 2
- Usable capacity
- 15 kWh
- Nominal capacity
- 15 kWh
- Chemistry
- Lithium iron phosphate (LFP)
- Charge/discharge
- 10 kW
Before You Decide
Checks that matter before price.
- Separate bill-shifting size from backup size before comparing models.
- Check usable capacity, discharge power, and expansion path together.
- Confirm whether the battery fits your existing inverter or needs a new system stack.
- Compare warranty terms and installer support, not only kWh per dollar.
| 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 | Certified installer wall- or floor-mounted indoor/outdoor residential battery installation. | Indoor / outdoor wall- or floor-mounted AC-coupled battery; Type 3R enclosure with IP67 battery pack and inverter rating. |
| Measurement | Battery storage telemetry through compatible inverter/BMS, not an inline energy meter | Residential battery-storage and integrated solar inverter system for backup, self-consumption, and time-of-use energy management. | AC-coupled residential battery storage for solar, grid, generator, EV, self-consumption, time-of-use, and backup operation. |
| Max current | 50 A | 48 A | Unknown |
| Inverter fit | |||
| Backup support | Backup and off-grid capable with a compatible high-voltage battery inverter and system design. | Seamless whole-home or partial-home backup is a core supported use case; Tesla's current support documentation says non-backup configuration is not supported for Powerwall 3. | Whole-home backup / Emergency Backup when installed as a compatible FranklinWH system with aGate. |
| Battery fit | |||
| Nominal capacity | Unknown | 13.5 kWh | 15 kWh |
| Usable capacity | Unknown | 13.5 kWh | 15 kWh |
| Chemistry | Lithium iron phosphate (LFP), cobalt-free | Lithium-ion; subtype not specified in reviewed public Tesla Powerwall 3 sources. | Lithium iron phosphate (LFP) |
| Charge/discharge power | Unknown | 11.5 kW | 10 kW |
| Warranty | 10 years | 10 years | 15 years |
| Expansion | 12-32 kWh usable per HVL tower; up to 96 kWh with 3 identical towers in parallel, subject to compatible inverter/system design | Up to 3 Powerwall 3 Expansion units per leader Powerwall 3; up to 4 Powerwall 3 units supported. | 15 kWh per unit; up to 15 units / 225 kWh per aGate |
| Monitoring | |||
| Protocol | CAN / RS485 | Tesla App / Wi-Fi / Ethernet / Cellular | FranklinWH App / aGate |
| Local API | No | No | No |
| Cloud dependency | No standalone BYD cloud path found; battery communication is CAN / RS485 through a compatible inverter and BMS. | Core backup operation is hardware-based; Tesla app/account and internet support monitoring, settings, Storm Watch, grid programs, and remote features. | FranklinWH App is the documented user interface; aPower 2 operates within the FranklinWH aGate system rather than as a standalone local-API battery. |
| Home Assistant | No | No | 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 | United States, Mexico, and Canada for the HVL/HVM-US warranty context; broader BYD Battery-Box availability varies by region and certified inverter list. | Tesla Powerwall markets including the United States and other country-specific Tesla Energy sales/installer regions; availability varies by location. | United States and Canada for SKU APR-10K15V2-US; other regions should be checked through FranklinWH or authorized dealers. |
| Source check | |||
| Last verified | Jun 15, 2026 | Jul 6, 2026 | Jun 6, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | 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.
FAQ
Common decision questions.
Which battery storage should I choose?
Choose the option that matches your installation constraints and data path first. For 3 battery storage options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.