Battery Comparison · Central Valley Solar
Tesla Powerwall 3 vs
Franklin aPower 2
Two of the most popular home batteries in the Central Valley — but they're built for different situations. Here's a complete, honest comparison to help you choose.
- Installing new solar + battery together (integrated inverter saves cost)
- You want maximum power output for whole-home backup (11.5 kW)
- Highest round-trip efficiency (97.5%) for daily NEM 3.0 cycling
- You want the most recognized brand for resale value
- Adding battery to an existing Enphase or any AC-coupled system
- You need maximum scalability (up to 15 units per system)
- You want inverter-agnostic flexibility for future upgrades
- Your installer recommends it for your specific system design
Key Numbers at a Glance
Full Specification Comparison
| Specification | Tesla Powerwall 3 | Franklin aPower 2 |
|---|---|---|
| Model | Powerwall 3 | aPower 2 |
| Usable capacity | 13.5 kWh | 13.6 kWh |
| Continuous power output | 11.5 kW (with solar) | 7.6 kW |
| Peak power (5 sec) | 22 kW | 15 kW |
| Integrated solar inverter | Yes — built-in 7.6 kW solar inverter | No — requires separate inverter |
| Inverter compatibility | Best with Tesla solar; limited 3rd-party AC coupling | Works with any inverter (AC-coupled) |
| Enphase compatibility | Limited — AC coupling only, with restrictions | Yes — AC-coupled, works well with Enphase |
| SolarEdge compatibility | Yes — DC-coupled via Powerwall 3 inverter | Yes — AC-coupled |
| Stackable (multiple units) | Yes — up to 4 per system | Yes — up to 15 per system |
| Round-trip efficiency | 97.5% | 89.0% |
| Warranty | 10 years / 70% capacity retention | 10 years / 70% capacity retention |
| Operating temperature | -20°C to 50°C | -10°C to 50°C |
| Monitoring app | Tesla app — polished, real-time | Franklin Home Power app |
| Whole-home backup | Yes — 11.5 kW continuous supports most loads | Yes — 7.6 kW continuous |
| Installation complexity | Moderate — integrated inverter simplifies wiring | Moderate — AC coupling requires coordination |
| Brand recognition / resale | Very high — widely recognized | Growing — less consumer recognition |
Tesla vs Franklin FAQ
What is the main difference between Tesla Powerwall 3 and Franklin aPower 2?
The biggest difference is the integrated inverter. The Tesla Powerwall 3 includes a built-in 7.6 kW solar inverter — meaning it can connect directly to solar panels without a separate inverter. This simplifies installation and reduces cost when going solar + battery together. The Franklin aPower 2 does not have an integrated inverter; it's AC-coupled and works with any existing inverter. This makes it more flexible for retrofitting battery storage onto an existing solar system.
Which battery has more power output?
Tesla Powerwall 3 has significantly higher power output: 11.5 kW continuous (with solar) and 22 kW peak for 5 seconds. Franklin aPower 2 delivers 7.6 kW continuous and 15 kW peak. The Powerwall 3's higher output means it can handle more simultaneous loads during a backup event — including central air conditioning, which draws 3,000–4,000 watts.
Which battery is more efficient?
Tesla Powerwall 3 has a round-trip efficiency of 97.5% — meaning 97.5% of the energy stored comes back out as usable power. Franklin aPower 2 has a round-trip efficiency of 89.0%. Over a year of daily cycling, this efficiency difference translates to meaningful additional savings with the Powerwall 3.
Which battery works better with Enphase?
Franklin aPower 2 is generally the better choice with an existing Enphase system. It's AC-coupled and integrates cleanly with Enphase IQ8 microinverters. Tesla Powerwall 3 can be AC-coupled with Enphase, but there are restrictions on system size and configuration. If you have an existing Enphase system and want to add battery storage, Franklin is typically the simpler, more compatible option.
Which battery is right for a new solar + battery system?
For a new solar + battery installation (no existing inverter), Tesla Powerwall 3 is often the better value. Its integrated inverter eliminates the need for a separate solar inverter, reducing equipment cost and installation complexity. The higher power output and efficiency also make it the stronger performer. For homeowners who want to add battery to an existing solar system, Franklin aPower 2's AC-coupling flexibility is a significant advantage.
Can I run my air conditioner on a home battery during a PSPS outage?
Yes — with the right battery. Tesla Powerwall 3's 11.5 kW continuous output can handle a 3-ton central AC unit (3,000–4,000 watts) along with other essential loads simultaneously. Franklin aPower 2's 7.6 kW output can also run AC, but with less headroom for other simultaneous loads. With solar recharging during the day, either battery can sustain AC operation through a multi-day PSPS event.
We install Tesla Powerwall and Franklin aPower throughout the Central Valley
We'll recommend the right battery for your inverter, usage, and backup goals. License #1063682.