Enphase IQ Battery 5P

Enphase IQ Battery 5P - Overview

The Enphase IQ Battery 5P is a 5 kWh LFP (Lithium Iron Phosphate) AC-coupled battery built for self-consumption and backup. All 5 kWh is usable, and there are six IQ8D-BAT grid-forming microinverters inside the box rather than one central power stage. LFP chemistry brings a lower thermal runaway risk and a longer cycle life than NMC alternatives. Because the 5P connects to the AC bus, it drops onto any existing solar system - SolarEdge, Fronius, SMA, Huawei - without touching the solar inverter.

AC Coupling - No Inverter Replacement Required

Sitting on the AC side is what makes this the retrofit battery. Nothing about your existing inverter has to change. The trade-off against a DC-coupled system such as the Powerwall 3 or a SolarEdge Home Hub is conversion loss: solar DC becomes AC, then DC again to charge, then AC again to feed the house. Each hop costs about 3 to 5%, which is why Enphase publishes a 90% round-trip figure rather than the mid-90s a DC-coupled battery can claim.

LFP Chemistry - Safety and Longevity

LFP cells contain no cobalt or nickel, which trims supply chain risk and thermal runaway hazard next to NMC chemistries. Enphase warrants the 5P to keep more than 60% of its capacity for 15 years or 6,000 cycles, whichever comes first. Cycle it once a day and you'll reach the cycle count somewhere around year 16, so in practice the calendar limit expires first. That 15-year term is the strongest thing on this datasheet and it gets mentioned far less than it deserves.

The North American unit is listed to UL 9540 and tested to UL 9540A, with UL 1973 and UN 38.3 on the cell module.

Enphase Ensemble Ecosystem

The IQ Battery 5P integrates with Enphase's Ensemble energy management system when paired with an IQ System Controller 3. The controller handles solar production, battery state of charge and tariff scheduling, and it's what makes whole-home backup possible during an outage. The 5P datasheet pairs it with the IQ System Controller 3 and 3G and the IQ Combiner 5 and 5C, so if a quote lists a Controller 2, that's last-generation kit.

What the US Datasheet Says

I haven't installed this battery. The numbers below come from Enphase's North America datasheet, DSH-00010-11.0-EN-2025-05-06, read on 2026-10-15.

Rated output depends on the grid. At 240 V split-phase it's 3.84 kVA at 16 A. At 208 V it drops to 3.33 kVA, still 16 A, and a footnote says backup or off-grid operation isn't supported on 208 V single-phase. Check your service voltage first. Peak output is 32 A for three seconds and 25.6 A for ten, and the sheet lists motor starting of up to 48 A LRA, noting it may vary.

Power factor is adjustable from 0.85 leading to 0.85 lagging. The sheet allows one unit per 20 A branch circuit and calls for an 80 A overcurrent device on 3 AWG cable.

The 5.0 kWh Isn't All Yours at Night

The sheet lists total and usable capacity as the same 5.0 kWh, then footnotes it. The usable figure includes a safety limit of 2% held back in case of a long outage, and a further 3% is kept to power the battery's own electronics overnight. So the energy you can plan around is a little under 5 kWh at the very bottom of the charge. Is that a flaw? No, every battery reserves something. It's just rare to see it printed.

The AC round trip is 90%, measured at 50% power. The DC figure is 96%. Nominal DC voltage is 76.8 V, maximum 86.4 V.

Temperature, Noise and Placement

Charging is allowed from -20 to 50 deg C and discharging to 55 deg C, but full performance needs 15 to 45 deg C while charging and 0 to 50 deg C while discharging. Noise is under 30 dBA at one meter and altitude is limited to 2,500 m. A footnote advises a garage-type indoor spot or an outdoor wall out of direct sun.

Compatibility and Compliance

The sheet lists IQ and M Series microinverters, the IQ System Controller 3 and 3G, the IQ Combiner 5 and 5C and the IQ Gateway. Modes are backup, self-consumption, time-of-use and NEM integrity. Compliance includes CA Rule 21 (UL 1741-SA), IEEE 1547:2018, UL 9540A, UL 1998 and UN 38.3, with UL 1973 on the cell module.

The US ordering codes are IQBATTERY-5P-1P-NA and a -DOM1 variant built in the US with some imported parts, aimed at the ITC domestic content adder per the datasheet footnote.

Enphase publishes no price. A distributor page I checked on 2026-10-15 showed the 5P in stock and asked for contact instead of giving a figure. My opinion: for an AC-coupled retrofit the 5P is hard to argue with. For a new build with a hybrid inverter already specced, a DC-coupled battery usually wins on round trip.

Key Advantages

• AC-coupled retrofit - adds storage to any existing solar system without an inverter swap
• LFP chemistry - safer and longer-lived than NMC; no cobalt
• NEMA 3R outdoor rated - fine on an exterior wall, though charging is limited below -20 deg C and it's happiest between 0 and 30 deg C
• Modular stacking - an IQ System Controller 3 takes up to 40 kWh of 5P units, or 80 kWh with PCS control
• 66.3 kg lifting weight - two installers can hang it; the 78.9 kg figure is the installed total
• Enphase Enlighten integration - battery state, cycles and grid interaction in the same app as the panels

Rating based on 389 installer and homeowner reviews.

Sources

• Enphase Energy, IQ Battery 5P North America data sheet, DSH-00010-11.0-EN-2025-05-06: enphase.com datasheet, read 2026-10-15
• Distributor listing checked 2026-10-15: Portlandia Electric Supply

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