Compare all three side by side
Open the Powerwall 3 vs Enphase IQ Battery 5P vs FranklinWH aPower 2 comparison for capacity, power, architecture, warranty and scalability in one mobile-friendly view.
For a more visual capacity-first view, open the 5 kWh vs 13.5 kWh vs 15 kWh battery guide with product photos, capacity bars and planning runtime examples.
How many home batteries do you need?
Use our energy-only sizing table to compare how many current battery units are required for 5-30 kWh/day of backed-up household energy, then check power and surge separately.
How many hours can your reserve actually run?
Convert battery capacity and backup reserve into estimated outage runtime using average critical load and delivered-energy efficiency. The tool also shows how runtime changes as household load rises.
Powerwall 3
Integrated solar inverter with six solar inputs and MPPTs.
View full specifications →
IQ Battery 5P
Compact 5 kWh building block for modular home storage systems.
View full specifications →
aPower 2
15 kWh usable system energy per unit.
View full specifications →| Specification | Tesla Powerwall 3 | Enphase IQ Battery 5P | FranklinWH aPower 2 |
|---|---|---|---|
| Usable capacity | 13.5 kWh | 5.0 kWh | 15 kWh |
| Continuous power | 11.5 kW on-grid / 11.5 kW backup | 3.84 kW | 10 kW |
| Peak / surge | Motor-start capability rated to 185 LRA | 7.68 kW for 3 seconds; 6.14 kW for 10 seconds | 15 kW for 10 seconds |
| System architecture | Integrated solar inverter; can also be added to existing solar | AC-coupled with six embedded grid-forming microinverters | AC-coupled |
| Warranty | 10-year limited warranty | 15-year limited warranty, up to 6,000 cycles | 15 years or 60 MWh throughput |
| Scalability | Expansion available; up to 40.5 kWh additional energy capacity per Powerwall 3 unit | Modular system design | Up to 225 kWh / 15 units per aGate |
Battery sizing is not just kWh
- Energy capacity tells you how much can be stored; power tells you how many large loads can run at once.
- Whole-home backup may require load controls, service upgrades, a gateway or system controller in addition to the battery.
- Time-of-use arbitrage and export programs can make a battery financially useful even where backup is not the primary goal.
- Use the Battery Calculator for daily backup-energy sizing or the Backup Runtime Calculator for outage hours at a specific average critical load.