FranklinWH aPower 2
FranklinWH states 15 kWh usable energy and 15 kWh nominal energy.
FranklinWH states 10 kW continuous power (AC).
Warranty terms: 15 years; warranted throughput: 60 MWh; capacity at warranty end: 70%.
Brand: FranklinWH
Published figures
No figures have been collected for units per system.
| Figure | Value | Publisher | Source |
|---|---|---|---|
| Usable energy | 15 kWh | Manufacturer Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Nominal energy | 15 kWh | Manufacturer Not yet checked | Warranty, at p.4 / Performance Warranty, retrieved Sep 23, 2026 |
| Continuous power (AC) | 10 kW | Manufacturer Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Peak power (AC) | 15 kW | Manufacturer Not yet checked | Spec sheet, at p.1 / Off-Grid Specifications, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Surge power (AC) | 25 kW | Manufacturer Not yet checked | Spec sheet, at p.1 / Off-Grid Specifications, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Motor start (LRA) | 185 A | Manufacturer Not yet checked | Spec sheet, at p.1 / Off-Grid Specifications, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Round-trip efficiency | 90% | Manufacturer Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Largest stack | 225 kWh | Manufacturer Not yet checked | Spec sheet, at p.1 / feature list, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Lowest operating temperature | −20°C | Manufacturer Not yet checked | Spec sheet, at p.2 / ENVIRONMENTAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Highest operating temperature | 50°C | Manufacturer Not yet checked | Spec sheet, at p.2 / ENVIRONMENTAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Weight | 162 kg | Manufacturer Not yet checked | Spec sheet, at p.2 / MECHANICAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
See it on the home battery chart
Stated stack range
One unit: 15 kWh usable. Largest stated stack: 225 kWh (energy basis not stated).
Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, p.1 / feature list, retrieved Sep 23, 2026, dated Dec 16, 2025 Not yet checked
Stated temperature limits
Stated operating range: −4°F (−20°C) to 122°F (50°C).
Spec sheet, at p.2 / ENVIRONMENTAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 Not yet checked
Battery’s stated motor-start current: 185 A (LRA means locked-rotor amps, a motor’s starting current). Compare starting current.
Warranty terms
| Term | Figure | Document |
|---|---|---|
| Warranty | 15 years | Warranty, at p.4 / Fifteen-Year Limited Warranty > Warranty Period, retrieved Sep 23, 2026 |
| Warranted throughput | 60 MWh | Warranty, at p.4 / Fifteen-Year Limited Warranty > Performance Warranty, retrieved Sep 23, 2026 |
| Capacity at warranty end | 70% | Warranty, at p.4 / Performance Warranty table, retrieved Sep 23, 2026 |
Warranty, at p.4 / Fifteen-Year Limited Warranty > Warranty Period, p.4 / Fifteen-Year Limited Warranty > Performance Warranty, p.4 / Performance Warranty table, retrieved Sep 23, 2026 Not yet checked
The stated 60 MWh equals 4,000 full cycles of its 15 kWh usable energy.
Features the manufacturer states
| Feature | Stated | Source |
|---|---|---|
| Chemistry | LFP Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Coupling | AC Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Backup | off-grid ready, Emergency Backup work mode Not yet checked | Spec sheet, at p.1 / intro, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Built-in inverter | Yes Not yet checked | Spec sheet, at p.1 / Flood Resistance row, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Enclosure rating | Type 3R, IP67 (battery pack & inverter), IP56 (wiring) Not yet checked | Spec sheet, at p.2 / ENVIRONMENTAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Grid voltage | 120/240 or 120/208 V AC Not yet checked | Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Dimensions | 1149 x 750 x 300 mm Not yet checked | Spec sheet, at p.2 / MECHANICAL SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 |
| Product status | current Not yet checked | Spec sheet, at p.2 footer, retrieved Sep 23, 2026, dated Dec 16, 2025 |
Government and program lists
This product is on none of the lists this site reads.
Installs
Medians require at least 20 priced installs for the named measure and period.
- Connecticut records 340 installs: 335 in 2024–2026 and 5 with no approval year. Source: Connecticut Energy Storage Solutions — enrollment. Median battery cost per kWh: $1,165, from 340 priced installs (335 in 2024–2026 and 5 with no approval year).
What Connecticut homes paid
All years includes 5 installs with no recorded approval year.
Figures are medians. Parentheses give the middle half of prices. A dash means too few prices for a median.
| Year | Pairing | Installs | Battery cost per kWh | Total battery cost | Contract price | Up-front incentive |
|---|---|---|---|---|---|---|
| All years | All pairings | 3405 with no approval year | $1,165 per kWh (middle half $1,072–$1,250)340 priced installs: 335 in 2024–2026 and 5 with no approval year | $34,275 (middle half $31,400–$37,495)340 priced installs: 335 in 2024–2026 and 5 with no approval year | $58,696 (middle half $38,967–$76,718)340 priced installs: 335 in 2024–2026 and 5 with no approval year | $7,500 (middle half $4,781–$11,250)340 priced installs: 335 in 2024–2026 and 5 with no approval year |
| All years | Paired with solar PV | 3323 with no approval year | $1,165 per kWh (middle half $1,072–$1,249)332 priced installs: 329 in 2024–2026 and 3 with no approval year | $34,275 (middle half $31,457–$37,446)332 priced installs: 329 in 2024–2026 and 3 with no approval year | $59,451 (middle half $38,995–$78,035)332 priced installs: 329 in 2024–2026 and 3 with no approval year | $7,500 (middle half $4,781–$11,250)332 priced installs: 329 in 2024–2026 and 3 with no approval year |
| All years | Standalone | 82 with no approval year | —8 priced installs: 6 in 2025–2026 and 2 with no approval year | —8 priced installs: 6 in 2025–2026 and 2 with no approval year | —8 priced installs: 6 in 2025–2026 and 2 with no approval year | —8 priced installs: 6 in 2025–2026 and 2 with no approval year |
| 2024 | All pairings | 13 | —13 priced installs, 2024 | —13 priced installs, 2024 | —13 priced installs, 2024 | —13 priced installs, 2024 |
| 2025 | All pairings | 239 | $1,153 per kWh (middle half $1,072–$1,248)239 priced installs, 2025 | $34,275 (middle half $31,438–$37,462)239 priced installs, 2025 | $63,645 (middle half $43,335–$78,238)239 priced installs, 2025 | $9,562 (middle half $6,750–$11,250)239 priced installs, 2025 |
| 2025 | Paired with solar PV | 234 | $1,160 per kWh (middle half $1,072–$1,249)234 priced installs, 2025 | $34,225 (middle half $31,419–$37,430)234 priced installs, 2025 | $64,126 (middle half $44,164–$78,538)234 priced installs, 2025 | $9,562 (middle half $6,750–$11,250)234 priced installs, 2025 |
| 2025 | Standalone | 5 | —5 priced installs, 2025 | —5 priced installs, 2025 | —5 priced installs, 2025 | —5 priced installs, 2025 |
| 2026 | All pairings | 83 | $1,199 per kWh (middle half $1,107–$1,288)83 priced installs, 2026 | $35,995 (middle half $32,497–$37,752)83 priced installs, 2026 | $52,585 (middle half $36,345–$74,328)83 priced installs, 2026 | $3,900 (middle half $900–$6,375)83 priced installs, 2026 |
| 2026 | Paired with solar PV | 82 | $1,199 per kWh (middle half $1,106–$1,282)82 priced installs, 2026 | $35,995 (middle half $32,995–$37,881)82 priced installs, 2026 | $52,935 (middle half $36,561–$75,091)82 priced installs, 2026 | $3,900 (middle half $900–$6,375)82 priced installs, 2026 |
| 2026 | Standalone | 1 | —1 priced install, 2026 | —1 priced install, 2026 | —1 priced install, 2026 | —1 priced install, 2026 |
Contract prices may include solar or other equipment. Prices are before the up-front incentive. Approvals run through Sep 29, 2026. Counts and prices are from the program’s Oct 1, 2026 release.
Compared with the Sep 1, 2026 release, the Oct 1, 2026 release adds 7 installs of this battery.
Recalls and safety notices
No notice in the recall sources this site reads is matched to this product. That is not a safety finding. See every recall notice.
- UL 9540 listed: YesSpec sheet, at p.2 / COMPLIANCE INFORMATION, retrieved Sep 23, 2026, dated Dec 16, 2025 Not yet checked
- UL 9540A tested: YesSpec sheet, at p.2 / COMPLIANCE INFORMATION, retrieved Sep 23, 2026, dated Dec 16, 2025 Not yet checked
The maker states the listing or test. The listing body's records have not been checked.
Backup hours from your load
The stated usable energy divided by your load gives hours, starting with a full battery.
The spec sheet states its usable energy at 25°C.
Spec sheet, at p.1 / PERFORMANCE SPECIFICATIONS, retrieved Sep 23, 2026, dated Dec 16, 2025 Not yet checked
Continuous power: 10 kW (AC)
Peak power: 15 kW (AC)
Backup hours follow the California Air Resources Board’s Zero Emissions Residential Backup Power Tool. Appliance figures come from the US Department of Energy’s Estimating Appliance and Home Electronic Energy Use (2012).
- The appliance figures are nameplate maximums. Average demand changes as appliances cycle and their settings change.
- A load above the stated continuous power gets no figure.
- Motor starts use three times the largest selected motor’s watts, plus the other loads. This estimate is checked against stated peak power when available. Other loads are counted at their running watts.
- Inverter and battery losses are not counted. A field study of household backup power explains the gap.
- Solar recharge, reserves, and temperature changes are outside the calculation.