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We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteReview, specs, and the honest install recommendation.
Quick Answer
FranklinWH aPower 2: 15 kWh LFP battery with 10 kW continuous / 15 kW peak output. NuWatt installs this as our highest-capacity single-unit pick. best for true whole-home backup, high-draw appliances, and homes where generator integration matters.
Our highest-capacity single-unit pick. Best for true whole-home backup, high-draw appliances, and homes where generator integration matters.
Capacity
15 kWh
Continuous
10 kW
Peak
15 kW
Warranty
15-yr
Price
$16.0-19.0k
Key features
Best for
Spec sheet
Made in California, USA (assembly) + imported cells
Run the math yourself
Both tools below are pre-configured to the FranklinWH aPower 2. Pick the appliances you need during an outage, adjust your annual outage hours, and compare against a generator.
Pick what stays on during an outage
Critical loads
4 selected
Simulated runtime
Battery can handle thisRuntime
2.5
days
Avg load
0.2
kW (of 10 kW max)
Peak surge
3.5
kW (of 15 kW peak)
Runtime calculated from 15 kWh usable × 95% round-trip efficiency = 14.3 kWh effective storage, divided by average load. Duty cycles assume intermittent operation (fridges cycle ~40% of the time, AC ~50%).
25-year total cost of ownership
Verdict
Generator wins by $4,502
A 22 kW standby saves $4,502 over 25 years for 24 hrs/year of outage.
22 kW standby
25-year total
$31,578
FranklinWH aPower 2
25-year total
$36,080
Side-by-side
Net difference: -$4,502 in favor of the generator
Beyond dollars
CO2 emissions (25-yr)
Noise while running
Like a dishwasher
Cutover time
Battery = no lights flicker
How we calculated this
This tool is honest by design: for homes with high annual outage hours, the right generator can beat a small battery on dollars alone. Decide what you’re optimizing for — up-front cost, lifetime cost, silence, emissions, or never hearing a pull-cord again.
Brand stability
FranklinWH is a privately-held California company focused on residential whole-home backup. Founded 2019. Growing US market share driven by the aPower 2 product line and inverter-agnostic installation flexibility. Strong dealer network and responsive warranty support.
Last reviewed: 2026-04-09
Federal ITC / domestic content
Franklin WH assembles in California but cell sourcing varies. For commercial ITC projects requiring the domestic content adder, request a written declaration of current cell origin at time of order.
Informational only — not tax advice. Confirm ITC qualification with a tax professional.
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Start my free quoteFrequently asked
Yes. The FranklinWH aPower 2 is in our active install stack across all 9 states we serve (MA, CT, NH, RI, VT, ME, NJ, PA, TX). Reach out through the quote form for a free site assessment and installed-price quote.
The FranklinWH aPower 2 has 15 kWh of nameplate capacity and 15 kWh of usable capacity — full nameplate capacity is accessible. Use the interactive outage simulator on this page to see exactly how long that capacity will run your specific appliances.
The FranklinWH aPower 2 uses LFP chemistry. LFP (Lithium Iron Phosphate) is the safest residential battery chemistry available, with no thermal-runaway risk and typical cycle life of 5,000–10,000 cycles. LFP is the dominant chemistry for new residential battery products in 2026.
15-year product warranty with a 6,000-cycle guarantee (whichever comes first). FranklinWH's warranty is backed by a financially stable parent company with a mature US warranty-service infrastructure.
Yes. Residential home batteries remain eligible for the 30% federal Investment Tax Credit in 2026 when paired with solar (Section 48E) or installed standalone under the IRA provisions. This is different from the residential solar panel credit (Section 25D) which expired December 31, 2025. For commercial ITC projects, see the FEOC section on this page for domestic-content-adder eligibility.