Franklin WH aPower vs Panasonic EverVolt AC Series EVAC-105
The Panasonic EverVolt AC Series EVAC-105 wins this battery comparison by a decisive margin. It delivers 17.1 kWh of usable storage with 9 kW continuous output and a 6,000-cycle rating, backed by a longer 15-year warranty. The 3.5 kWh capacity advantage provides 5 additional hours of essential-load backup.
Key Differences
- • Panasonic EverVolt AC Series EVAC-105 provides 17.1 kWh vs 13.6 kWh usable capacity.
- • Panasonic EverVolt AC Series EVAC-105 achieves 92% round-trip efficiency vs 89%.
- • Panasonic EverVolt AC Series EVAC-105 offers a longer 15-year warranty vs 12 years.
Specifications Breakdown
Usable Storage Capacity
The Franklin WH aPower provides 13.6 kWh of usable capacity (13.6 kWh total, 100% DoD), while the Panasonic EverVolt AC Series EVAC-105 offers 17.1 kWh usable (17.1 kWh total, 100% DoD). At an average essential-load consumption rate of 750 watts, the Franklin WH aPower provides approximately 18.1 hours of backup versus 22.8 hours for the Panasonic EverVolt AC Series EVAC-105. The Panasonic EverVolt AC Series EVAC-105's 3.5 kWh capacity advantage translates to roughly 5 additional hours of essential-load backup during a grid outage. The Franklin WH aPower is scalable up to 15 units (204 kWh total), while the Panasonic EverVolt AC Series EVAC-105 scales up to 4 units (68 kWh total).
Power Output
The Franklin WH aPower delivers 5 kW continuous and 10 kW peak power, while the Panasonic EverVolt AC Series EVAC-105 provides 9 kW continuous and 11 kW peak. The Panasonic EverVolt AC Series EVAC-105's higher continuous output means it can simultaneously power more demanding appliances during an outage. A central air conditioner typically draws 3-5 kW, a refrigerator 0.1-0.2 kW, and an EV Level 2 charger 7-11 kW. Peak power rating matters for motor-driven loads with high startup current, such as air conditioners, well pumps, and sump pumps. The Panasonic EverVolt AC Series EVAC-105's 11 kW peak is capable of starting most residential HVAC systems.
Battery Chemistry & Cycle Life
The Franklin WH aPower uses LFP chemistry with a rated cycle life of 6,000 cycles (approximately 16.4 years of daily cycling), while the Panasonic EverVolt AC Series EVAC-105 uses LFP with 6,000 cycles (approximately 16.4 years). Both use LFP chemistry, which is considered the gold standard for residential energy storage due to its inherent safety, long cycle life, and environmental friendliness. Identical cycle ratings mean both batteries have the same expected operational lifespan under daily cycling.
Round-Trip Efficiency
The Franklin WH aPower achieves 89% round-trip efficiency versus 92% for the Panasonic EverVolt AC Series EVAC-105. This means for every 10 kWh of solar energy stored in the Panasonic EverVolt AC Series EVAC-105, 9.2 kWh is recoverable, compared to 8.9 kWh for the other. Over 10 years of daily cycling with 15 kWh average daily throughput, the more efficient battery saves approximately $246 in energy that would otherwise be lost as heat (at $0.15/kWh average retail rate). Higher round-trip efficiency is especially valuable in time-of-use rate environments where you are storing cheap off-peak energy for expensive peak-hour consumption.
Warranty & Long-Term Protection
The Franklin WH aPower carries a 12-year warranty and 43 MWh throughput, while the Panasonic EverVolt AC Series EVAC-105 offers 15 years. The Panasonic EverVolt AC Series EVAC-105 provides 3 additional years of manufacturer protection against capacity degradation and defects. Battery warranties typically guarantee the unit will retain 60-70% of original capacity by end of warranty, so the length of coverage directly impacts your financial risk over the system's lifetime.
Specification Comparison
| Specification | Franklin WH aPower | Panasonic EverVolt AC Series EVAC-105 |
|---|---|---|
| Capacity | 13.6 kWh | 17.1 kWh |
| Usable Capacity | 13.6 kWh | 17.1 kWh |
| Power Output | 5 kW | 9 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 89% | 92% |
| Cycle Life | 6,000 | 6,000 |
| Weight | 130 kg | 150 kg |
| Warranty | 12 years | 15 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: Panasonic EverVolt AC Series EVAC-105The Panasonic EverVolt AC Series EVAC-105 provides 17.1 kWh versus 13.6 kWh — 3.5 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 5 additional hours of backup power. The capacity difference is moderate.
2. Power Output
Winner: Panasonic EverVolt AC Series EVAC-105The Panasonic EverVolt AC Series EVAC-105 delivers 9 kW continuous versus 5 kW. This is enough to run a central AC unit, refrigerator, and general household loads simultaneously. The 4.0 kW power gap significantly impacts what appliances you can run during outages.
3. Chemistry & Longevity
Winner: TieBoth use LFP chemistry with identical 6,000-cycle ratings. LFP chemistry provides excellent thermal stability, long cycle life, and no cobalt dependency.
4. Round-Trip Efficiency
Winner: Panasonic EverVolt AC Series EVAC-105The Panasonic EverVolt AC Series EVAC-105 achieves 92% round-trip efficiency versus 89%. Over 10 years of daily cycling with 15 kWh throughput per day, the more efficient battery saves approximately 246 dollars in energy that would otherwise be lost as heat (at $0.15/kWh). The difference is moderate but compounds over the battery's lifespan.
5. Warranty Coverage
Winner: Panasonic EverVolt AC Series EVAC-105The Panasonic EverVolt AC Series EVAC-105 offers a 15-year warranty versus 12 years. This is among the longest battery warranties in the residential market.
Franklin WH aPower
The Franklin WH aPower is a 13.6 kWh LFP battery designed to work with the Franklin aGate energy management gateway for comprehensive whole-home energy control. Its 10 kW peak power capability handles demanding startup surges from appliances like air conditioners and well pumps. With support for up to 15 units, the system scales to 204 kWh for commercial-grade residential applications. The inverter-agnostic AC-coupled design makes it compatible with virtually any existing solar installation, making it one of the most flexible battery options available. Franklin backs it with a 12-year warranty and 43 MWh throughput guarantee.
Pros
- + Exceptional scalability with up to 15 units for 204 kWh total capacity
- + 10 kW peak power handles heavy appliance startup surges
- + Inverter-agnostic AC-coupled design works with any solar system
- + 12-year warranty with 43 MWh throughput guarantee exceeds industry standard
Cons
- - Requires the separate aGate unit for full backup and management features
- - 89% round-trip efficiency is below average for LFP batteries
- - 5 kW continuous output per unit is modest for the capacity
Panasonic EverVolt AC Series EVAC-105
The Panasonic EverVolt AC Series EVAC-105 is the AC-coupled variant of the EverVolt 2.0 platform, delivering 17.1 kWh of LFP storage with 9 kW of continuous backup power. As an AC-coupled system, it retrofits seamlessly with any existing solar installation regardless of inverter brand. The 15-year warranty reflects Panasonic's confidence in the LFP cell chemistry and advanced thermal management system. Four units can be combined for 68.4 kWh of total storage, making it one of the highest-capacity residential AC-coupled configurations available on the market.
Pros
- + 17.1 kWh is among the largest single-unit residential battery capacities
- + 9 kW continuous output supports heavy loads during backup
- + 15-year warranty with LFP chemistry for exceptional longevity
- + AC-coupled design retrofits with any existing solar inverter
Cons
- - Heavy at 150 kg, requiring robust mounting or floor placement
- - AC-coupled conversion adds slight efficiency loss compared to DC-coupled
- - Premium pricing reflects Panasonic brand and larger capacity
Choose Franklin WH aPower If...
- ✓ You want the flexibility to expand storage capacity over time (up to 15 units)
- ✓ Homeowners who need massive scalability and inverter-agnostic compatibility with a focus on whole-home backup
Choose Panasonic EverVolt AC Series EVAC-105 If...
- ✓ You need more backup storage to cover overnight consumption or extended outages
- ✓ You need to power demanding appliances (AC, EV charger) simultaneously during outages
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ A 15-year warranty gives you the confidence you need
- ✓ Homeowners with existing solar systems who want a high-capacity, high-power AC-coupled battery backed by Panasonic's reliability
Our Recommendation
The Panasonic EverVolt AC Series EVAC-105 is the decisive winner in this battery comparison, outperforming the Franklin WH aPower in 4 of 5 dimensions. Unless you have a specific requirement that the Franklin WH aPower uniquely addresses, the Panasonic EverVolt AC Series EVAC-105 is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Franklin WH aPower or Panasonic EverVolt AC Series EVAC-105?
The Panasonic EverVolt AC Series EVAC-105 wins this battery comparison by a decisive margin. It delivers 17.1 kWh of usable storage with 9 kW continuous output and a 6,000-cycle rating, backed by a longer 15-year warranty. The 3.5 kWh capacity advantage provides 5 additional hours of essential-load backup.
Which battery lasts longer?
The Franklin WH aPower is rated for 6,000 cycles versus 6,000 for the Panasonic EverVolt AC Series EVAC-105. Both have identical expected cycle life. LFP chemistry generally outlasts NMC in cycle life testing.
Which battery provides more backup power?
The Franklin WH aPower provides 5 kW continuous (10 kW peak) versus 9 kW continuous (11 kW peak) for the Panasonic EverVolt AC Series EVAC-105. Panasonic EverVolt AC Series EVAC-105 can run more appliances simultaneously during an outage. A central AC typically needs 3-5 kW, a refrigerator 0.2 kW, and an EV charger 7-11 kW.
Can I expand Franklin WH aPower or Panasonic EverVolt AC Series EVAC-105 storage later?
Franklin WH aPower: Yes, up to 15 units for 204 kWh total. Panasonic EverVolt AC Series EVAC-105: Yes, up to 4 units for 68 kWh total. Franklin WH aPower offers more expansion potential.
Which battery chemistry is safer?
Both use LFP (Lithium Iron Phosphate) chemistry, which is the safest lithium battery chemistry for residential use. LFP does not undergo thermal runaway, uses no cobalt, and is inherently stable.
Related Resources
Last updated: February 2026