Enphase has launched a fourth generation of its IQ Battery family, the maker announced on 1 May 2025. The company describes the range as redesigned from the inside out, with nearly 34% greater energy density than the previous generation and fewer components mounted on the wall1.
"Redesigned from the inside out, our most advanced battery yet delivers nearly 34% greater energy density than its predecessor."
The announcement gives no capacity figures in kilowatt hours, no prices and no UK availability date for the new family. Those details have not been reported1. Enphase's existing IQ Battery 5P sits in the current range, and the company's wider IQ Battery range is documented separately.
Enphase states that IQ Batteries are NEMA 3R rated and will deliver power in rain, sleet, snow and ice, and that they operate with low-voltage DC power rather than high-voltage DC1. The company also says the batteries are the first microinverter-based storage system to meet the performance criteria of UL 9540A, a unit-level test for thermal runaway fire propagation protection in residential indoor wall-mounted systems1. Warranty is stated as 15 years, limited1.
Two software features are named. PowerMatch is said to adjust automatically to changing energy demand, activating only the microinverters needed, which Enphase links to higher efficiency and less waste1. Storm Guard monitors the National Weather Service for approaching storms and, if one is detected, charges the batteries fully for maximum backup power1. Over-the-air updates are said to add features to the system and the Enphase App over time1. The system is described as expandable, with additional batteries added as needs grow, and an integrated load controller allows power-hungry appliances to be switched on and off from the app during an outage1.
| Feature | Enphase statement |
|---|---|
| Energy density | Nearly 34% greater than predecessor |
| Weather rating | NEMA 3R |
| Warranty | 15-year limited |
| Safety test | Meets UL 9540A performance criteria (unit-level, indoor wall-mounted) |
| Power architecture | Low-voltage DC |
| Expansion | Additional batteries can be added over time |
Why it matters for households
Energy density is the measure of how much storage fits into a given unit, so a denser battery can mean less wall space used for the same capacity, or more capacity in the same footprint. For a home, that affects where a battery can physically go, particularly in smaller properties or where a garage or utility wall is already occupied. Fewer components on the wall points the same way1.
The safety and weather claims matter for siting decisions. A NEMA 3R rating indicates protection against rain, sleet, snow and ice, and the UL 9540A reference concerns fire propagation in indoor wall-mounted units, which is relevant where a battery is installed inside the home rather than outside1. Low-voltage DC operation is presented by the maker as avoiding the hazards of high-voltage DC1.
Backup behaviour is the other practical thread. Storm Guard and the integrated load controller are aimed at stretching stored charge through an outage, by pre-charging ahead of a forecast storm and by switching off heavy appliances remotely1. Over-the-air updates mean the control features can change after installation without new hardware1.
What happens next
No UK launch date, capacity figures or pricing for the fourth generation family have been reported1. Households comparing storage options can read the site's guides to all-in-one battery systems and battery management systems, or the wider home batteries and manufacturers sections.