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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
Tesla Powerwall 3: 13.5 kWh LFP battery with 11.5 kW continuous / 22 kW peak output. NuWatt installs this as our single-unit whole-home backup pick. powerwall 3 delivers the highest continuous and peak power of any residential battery, with integrated solar inverter and proven tesla warranty support.
Our single-unit whole-home backup pick. Powerwall 3 delivers the highest continuous and peak power of any residential battery, with integrated solar inverter and proven Tesla warranty support.
Capacity
13.5 kWh
Continuous
11.5 kW
Peak
22 kW
Warranty
10-yr
Price
$14.0-16.5k
Key features
Best for
Spec sheet
Made in Lathrop, California, USA
Run the math yourself
Both tools below are pre-configured to the Tesla Powerwall 3. 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
2.3
days
Avg load
0.2
kW (of 11.5 kW max)
Peak surge
3.5
kW (of 22 kW peak)
Runtime calculated from 13.5 kWh usable × 97% round-trip efficiency = 13.1 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
Break even over 25 years
Within 10% over 25 years — lifestyle factors (noise, emissions, maintenance) likely decide it.
22 kW standby
25-year total
$31,578
Tesla Powerwall 3
25-year total
$31,675
Side-by-side
Net difference: -$96 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
Tesla Energy is a division of Tesla, Inc. (NASDAQ: TSLA, ~$800B market cap). Powerwall is the best-selling home battery in the US by volume. Warranty service infrastructure is mature and integrated with the Tesla ecosystem.
Last reviewed: 2026-04-09
Federal ITC / domestic content
Tesla Energy manufactures Powerwall 3 in Lathrop, California with some cells sourced from Tesla partners. For commercial ITC projects, the domestic content adder eligibility depends on the specific cell supply chain at the time of manufacture — request a written cell-origin declaration per project.
Informational only — not tax advice. Confirm ITC qualification with a tax professional.
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Start my free quoteFrequently asked
Yes. The Tesla Powerwall 3 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 Tesla Powerwall 3 has 13.5 kWh of nameplate capacity and 13.5 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 Tesla Powerwall 3 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.
10-year product warranty with a 5,000-cycle guarantee (whichever comes first). Tesla'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.