Enphase IQ Battery Explained: 5P vs 10C Specs, Cost and Warranty

An Enphase battery is a modular, AC-coupled home battery with built-in microinverters, sold today mainly as the IQ Battery 5P (5 kWh) and the newer IQ Battery 10C (10 kWh). It stores solar or grid power for use at night, during peak-rate hours or in an outage. On EnergySage's marketplace, Enphase batteries averaged about $1,429 per kWh in the first half of 2026, or roughly $14,290 for a typical 10 kWh system before incentives.

Key takeaways

• Enphase IQ Batteries use lithium iron phosphate (LFP) cells and are AC-coupled, so each unit has its own inverters.
• The IQ Battery 10C doubles the 5P's energy and nearly doubles its continuous power.
• Both models carry a warranty of up to 15 years or 6,000 cycles, whichever comes first, at 60% capacity.
• Since August 2026, Enphase says the 10C can be added to existing non-Enphase solar in the US and Canada.
• The federal residential clean energy credit does not apply to expenditures made after December 31, 2025.

What is the Enphase battery and how does it work?

Most home batteries need one large inverter to turn stored DC power into AC power for your home. Enphase takes a different approach. Each IQ Battery has small microinverters inside it. The IQ Battery 10C datasheet lists four embedded IQ8B microinverters.

Because the conversion happens inside the battery, Enphase batteries connect on the AC side of your home's wiring. That makes them AC-coupled. It also means you can add capacity in steps instead of buying one large unit.

Like other home batteries, an Enphase system can:

• Store extra solar from midday for use in the evening
• Run your home during peak-rate hours on a time-of-use plan
• Keep selected circuits, or the whole home, running when the grid goes down

Enphase IQ Battery 5P vs 10C specs

These figures come from Enphase's U.S. datasheets for each model.

EnergySage reported in June 2025 that the 10C reached the market in early summer 2025, and its comparison table lists a maximum system size of 80 kWh. The 10C's higher continuous power matters if you want to run large loads, such as a well pump or central air, during an outage.

Sizing an Enphase battery system

Because Enphase batteries are modular, sizing is mostly about how many units you stack.

• Energy (kWh): How long you can run. Two 10C units give you 20 kWh.
• Power (kW): How much you can run at once. Power adds up with each unit as well.

Start with your goal. For evening bill savings, look at how much you use during your utility's peak window. For backup, list the essential loads you want to keep on. Berkeley Lab found the median home battery installed in 2025 held 13.5 kWh, which gives a sense of a common size. Our guide on how big a solar battery you need walks through the math.

A practical tip: check motor loads. Air conditioners and pumps draw a surge when they start. Ask your installer to confirm the battery's peak rating can handle your largest motor.

How much does an Enphase battery cost?

Prices vary by region, installer and how much electrical work your home needs. Here are the dated figures we could verify.

Note that Enphase's per-kWh average was higher than Tesla's ($967 per kWh) in the same EnergySage data. Part of the trade-off is the modular, microinverter design.

Tax credit status: The IRS says the residential clean energy credit, which covered batteries of at least 3 kWh, is not available for expenditures made after December 31, 2025. Older articles that subtract 30% from Enphase prices no longer apply to new installs. For a battery, the expenditure counts as made when installation is complete, so a battery finished in 2026 does not qualify. Check battery storage incentives for state and utility programs.

Enphase battery for backup vs bill savings

Whether an Enphase battery makes sense depends on what you want it to do.

Backup power

Grid-tied solar alone shuts down in an outage. With Enphase batteries and the right controls, your home can disconnect from the grid and keep running. Enphase says that with its newer setup for third-party solar, existing panels can keep recharging the battery during an outage when the sun comes up.

Bill savings

Savings depend on your utility's rates. If your plan charges more in the evening, the battery can cover that window with stored solar. For example, PG&E's E-TOU-C plan sets peak hours from 4 to 9 p.m. every day, according to its March 2026 rate sheet. Our time-of-use rates guide explains how to check your plan.

If your utility still credits exports at the full retail rate, the savings case is weaker. See are solar batteries worth it for a full breakdown.

Installation, placement and operating limits

Enphase batteries are rated for outdoor-type enclosures (NEMA 3R on the 5P datasheet), but temperature still matters. Both datasheets list these ranges:

• Charging: -4°F to 122°F
• Discharging: -4°F to 131°F
• Best performance: 32°F to 86°F

A shaded wall or a garage that stays mild will help the battery work at its best. The two models also differ in shape. The 5P is a slim wall unit about 38.6 by 21.7 by 7.4 inches. The 10C is squarer and deeper at about 24.5 by 28 by 14.4 inches and weighs 317 pounds installed, so your installer will need a suitable wall or floor mount.

The 10C datasheet lists compatibility with IQ and M Series microinverters, the IQ Meter Collar, IQ Combiner 6C and IQ Gateway. The 5P datasheet lists IQ System Controller 3/3G and IQ Combiner 5/5C. That means the parts your home needs depend on which battery and which generation of Enphase equipment you have.

Pros and cons at a glance

• Pros: Modular sizing, LFP chemistry, a long warranty term and an AC-coupled design that suits many retrofits.
• Cons: A higher average price per kWh than some rivals in 2026 EnergySage data, and the warranty requires a constant internet connection.

Enphase battery warranty and lifespan

Enphase's U.S. limited warranty for the IQ Battery 5P runs until the earlier of 15 years from activation or 6,000 discharged cycles. During that time the battery should hold at least 60% of its nameplate capacity. The 10C datasheet lists the same 15-year, 6,000-cycle, 60% terms.

Read these conditions closely:

• Internet connection: The warranty says products should stay continuously connected to the internet.
• Labor: The warranty excludes labor for uninstalling and reinstalling. Ask whether your installer covers it.
• Selling your home: Coverage can continue for a new owner if the battery stays at its original location, a Change of Ownership Form is filed and the transfer fee is paid within 30 days of the transfer.

Next steps

Compare Enphase against other options in our Powerwall 3 vs Enphase IQ Battery guide, and read about the company on our Enphase profile. When quotes arrive, run them through the solar quote checker.