Home Battery Storage
Enphase IQ Battery 5P
A modular 5 kWh battery built around Enphase's microinverter architecture, backed by the longest standard warranty in the category — at a real premium in cost per kWh.
2 min read
Licensed Electrical Engineer
Overall Rating
4.2 / 5
Price range: $5,000–$8,500 installed per unit (before controller hardware)
Pros
- +15-year warranty, guaranteeing at least 70% capacity retention — the longest standard warranty of any major home battery
- +Modular design: stack units from 5 kWh up to 80 kWh without rewiring the whole system
- +No single point of failure — each unit has its own microinverters, so one unit's issue doesn't take down the rest
- +Deep integration if you already have Enphase microinverters on your solar array
Cons
- –Highest cost per kWh of the batteries we've reviewed, around $1,000–$1,700/kWh versus roughly $630–$890/kWh for the Powerwall 3
- –3.84 kW continuous output per unit is modest — whole-home backup requires stacking 4+ units
- –Requires the separate IQ System Controller for backup capability, adding $1,500–$2,000 to a first installation
- –Wi-Fi-only communication; no cellular backup connection option
The short version
The Enphase IQ Battery 5P takes a different approach than most home batteries. Instead of one large unit sized once at purchase, it's a 5.0 kWh module with its own six embedded microinverters — and you stack as many as you need, from a single unit up to 80 kWh across sixteen units. That modularity mirrors how Enphase's solar microinverters already work: no single point of failure, and the ability to add capacity later without redesigning the whole system.
The other standout feature is the warranty. Enphase backs the IQ Battery 5P for 15 years, guaranteeing at least 70% of original capacity at the end of that period — five years longer than Tesla's Powerwall 3 warranty, and currently the longest standard warranty among major home batteries.
Where it falls short
Modularity and warranty length come at a real cost. At roughly $1,000–$1,700 per kWh installed, the IQ 5P is meaningfully more expensive per unit of storage than the Powerwall 3's $630–$890 per kWh. If your priority is maximum capacity for the lowest total cost, this is the battery's clearest weakness.
Power output per unit is also modest: 3.84 kW continuous, with peak output of 7.68 kW for short bursts. A single unit is fine for essential circuits — refrigerator, lights, internet, a few outlets — but running a whole home, including central air conditioning, typically requires four to six units.
There's also a hardware requirement worth budgeting for: backup capability needs the separate IQ System Controller, which adds roughly $1,500–$2,000 to your first installation on top of the per-unit battery cost.
What it costs
Expect to pay $5,000–$8,500 per unit fully installed, plus $1,500–$2,000 for the IQ System Controller on your first unit. A two-unit system (10 kWh, enough for essential-loads backup) typically lands in the $15,000–$17,000 range before incentives. As of 2026 there's no federal tax credit for a standalone battery purchase, though state and utility programs — California's SGIP among them — may still apply depending on where you live.
Who it's actually right for
The IQ Battery 5P makes the most sense if you already have Enphase microinverters on your roof, want the option to start small and expand gradually, or simply want the longest warranty coverage available and are willing to pay for it. It's a weaker fit if your main goal is whole-home backup on a tight budget, since matching the Powerwall 3's capacity and power output takes several units at a meaningfully higher total cost.