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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
EcoFlow DELTA Pro Ultra: 6 kWh LFP battery with 7.2 kW continuous / 14.4 kW peak output. NuWatt does not install this battery. EcoFlow DELTA Pro Ultra is a portable-power product adapted for semi-permanent home use. 5-year warranty is half the US-market standard for residential batteries. NuWatt installs Enphase IQ Battery 5P for entry-level home backup with 15-year warranty and full UL residential certification.
EcoFlow DELTA Pro Ultra is a portable-power product adapted for semi-permanent home use. 5-year warranty is half the US-market standard for residential batteries. NuWatt installs Enphase IQ Battery 5P for entry-level home backup with 15-year warranty and full UL residential certification.
Capacity
6 kWh
Continuous
7.2 kW
Peak
14.4 kW
Warranty
5-yr
Price
$5.5-9.5k
Key features
Best for
Spec sheet
Made in China
EcoFlow DELTA Pro Ultra is a portable-power product adapted for semi-permanent home use. 5-year warranty is half the US-market standard for residential batteries. NuWatt installs Enphase IQ Battery 5P for entry-level home backup with 15-year warranty and full UL residential certification.
NuWatt’s pick
Our modular-expansion pick. Start with one 5 kWh unit, add more as needs grow. Best for homeowners who want to start small with essential-load backup and scale into whole-home over time.
Capacity
5 kWh
Power
3.84 kW
Chemistry
LFP
Warranty
15-yr
Run the math yourself
Pick the appliances you need during an outage and see exactly how long the EcoFlow DELTA Pro Ultra will run them.
Pick what stays on during an outage
Critical loads
4 selected
Simulated runtime
Battery can handle thisRuntime
23.5
hours
Avg load
0.2
kW (of 7.2 kW max)
Peak surge
3.5
kW (of 14.4 kW peak)
Runtime calculated from 6 kWh usable × 93% round-trip efficiency = 5.6 kWh effective storage, divided by average load. Duty cycles assume intermittent operation (fridges cycle ~40% of the time, AC ~50%).
Brand stability
EcoFlow is a Chinese portable power company (HK) founded 2017. DELTA Pro and DELTA Pro Ultra are marketed as home-battery alternatives but their permanent-install certification varies by jurisdiction. Great for mobile/semi-permanent use; not typically eligible for utility-grade permanent interconnection.
Last reviewed: 2026-04-09
Federal ITC / domestic content
EcoFlow is a Chinese company (Shenzhen-based, founded 2017). Full FEOC exposure. Not eligible for the domestic content adder. Warranty infrastructure and parts availability in the US is limited compared to Tesla or Enphase.
Informational only — not tax advice. Confirm ITC qualification with a tax professional.
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No. NuWatt does not currently install the EcoFlow DELTA Pro Ultra. For the same use case, we install the Enphase IQ Battery 5P — see the "NuWatt's recommendation" section above for a detailed comparison.
The EcoFlow DELTA Pro Ultra has 6 kWh of nameplate capacity and 6 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 EcoFlow DELTA Pro Ultra 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.
5-year product warranty with a 3,500-cycle guarantee (whichever comes first). Note: EcoFlow's parent company is on our watchlist — see the Brand Stability section on this page for details on warranty enforcement risk.
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.