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Enphase IQ Battery 5P - Specs, Cost & Full Review

Modular microinverter-based battery. Stack multiple units for more capacity. Best paired with Enphase solar systems.

Capacity
5 kWh

Usable energy storage

Power Output
3.84 kW

Continuous AC power

Efficiency
96%

Round-trip efficiency

Warranty
15 years

10,950 kWh throughput

Cost & Tax Credit

Average Installed Cost

$5,500

Range: $5,000–$8,000 per unit

Federal ITC (30%)

-$1,650

Qualifies with solar system

Net Cost After ITC

$3,850

Your effective investment

ITC Eligibility: The Enphase IQ Battery 5P qualifies for the 30% federal Investment Tax Credit when installed with a solar system, or as a standalone unit charged exclusively by solar. File IRS Form 5695 with your federal return. Calculate your credit →

Technical Specifications

BrandEnphase
ModelIQ Battery 5P
Battery ChemistryLithium Iron Phosphate (LFP)
Usable Capacity5 kWh
Continuous Power Output3.84 kW
Round-Trip Efficiency96%
Warranty Duration15 years
Warranty Throughput10,950 kWh
Grid-Tied OperationYes
Off-Grid CapableNo
Scalable / StackableYes
Market Share (US)22%
Average Installed Cost$5,000–$8,000 per unit

Pros & Cons

Pros

  • 15-year warranty (longest in category)
  • Highly modular — add units as needed
  • Excellent monitoring via Enphase app
  • Microinverter-based = no single point of failure

Cons

  • Lower power output than Powerwall
  • More expensive per kWh when scaled up
  • Best value only with Enphase solar system

Is the Enphase IQ Battery 5P Worth It?

The Enphase IQ Battery 5P is the best choice for homeowners already using Enphase microinverter solar systems and those who want maximum flexibility to scale storage over time. The 15-year warranty is unmatched in the market. However, at 5 kWh per unit, most homes need 2-3 units for meaningful backup, pushing total costs to $11,000-$24,000. For standalone value, it's more expensive per kWh than Powerwall. It's worth it for Enphase ecosystem users - less compelling for everyone else.

vs. Tesla Powerwall 3 (Market Leader)

The Tesla Powerwall 3 (13.5 kWh, 11.5 kW) offers nearly 3x the power output of a single IQ Battery 5P (3.84 kW) and 2.7x the capacity. For equal capacity (3 units of IQ Battery 5P = 15 kWh), you pay $16,500-$24,000 vs. $11,000-$16,000 for Powerwall - significantly more per kWh. The Enphase advantage is its 15-year warranty (vs. 10 years for Powerwall) and seamless integration with Enphase solar systems.

Read Tesla Powerwall 3 Review

Works Best With

Enphase IQ MicroinvertersEnphase IQ8 Series

Compatibility based on manufacturer specifications. Always confirm compatibility with your installer before purchase.

Enphase IQ Battery 5P - FAQ

Most homes need 2–4 units for meaningful backup. One unit (5 kWh) covers essential loads for a few hours. Two units (10 kWh) handles overnight backup for lights, refrigerator, and internet. Three units (15 kWh) provides whole-day coverage for moderate users.
The IQ Battery 5P is designed for Enphase IQ microinverter systems and requires the Enphase IQ System Controller 3 for backup functionality. It does not integrate natively with string inverter systems from other brands.
The 15-year warranty is the longest available in the residential battery market, compared to 10 years for Tesla and SolarEdge. It demonstrates confidence in LFP chemistry longevity and reduces replacement risk over the system's life.
Yes, it qualifies for the 30% federal ITC when installed as part of a solar system or if exclusively charged by solar. Because it's scalable, you can also claim the credit on additional units added in future years.
The IQ Battery 5P requires grid connection for proper operation and grid-forming capability. It provides seamless backup when the grid goes down (grid-tied with backup), but is not designed for true off-grid or island-mode use without grid access.

Compare Other Batteries

Tesla

Powerwall 3

13.5 kWh

SolarEdge

Home Battery 48V

9.7 kWh

LG

RESU16H Prime

16 kWh

Generac

PWRcell

9 kWh

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Specifications sourced from manufacturer documentation. Pricing based on EnergySage installer data • Updated 2026.