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Enphase announced the IQ Battery 10C this week, a new single-unit 10 kWh battery that addresses the main criticism of the IQ Battery 5P (too many units required for whole-home backup). The 10C packs 10 kWh of capacity and 9.2 kW continuous output into a single enclosure — meaning a single 10C can start a 3-ton central AC compressor, which previously required 3+ 5P units.
Specs at a glance
| Specification | IQ Battery 5P | IQ Battery 10C (new) |
|---|---|---|
| Usable capacity | 5.0 kWh | 10.0 kWh |
| Continuous output | 7.6 kW (per 3-unit stack) | 9.2 kW (single unit) |
| Surge output | 104 LRA per unit | 150 LRA |
| Chemistry | LFP | LFP |
| Round-trip efficiency | 96% | 95% |
| Warranty | 15 years / 6,000 cycles | 15 years / 6,000 cycles |
| Estimated installed cost | $4,800–$5,600 / unit | $9,800–$11,200 |
Why the 10C matters
The IQ Battery 5P has been Enphase's flagship residential battery since 2023, and it's an excellent product — best round-trip efficiency in the segment (96%), best warranty (15 years / 6,000 cycles), and the modular flexibility to start small and expand. But the 5P's 5 kWh per-unit capacity meant whole-home backup required 3+ units (15+ kWh total), pushing installed cost above $14,000 — a 25–35% premium over a single Tesla Powerwall 3 with similar capacity.
The 10C solves that problem. A single 10C unit ($9,800–$11,200 installed) provides 10 kWh of storage with enough continuous output (9.2 kW) to start a 3-ton central AC compressor — covering most 2,000–2,500 sq ft homes' essential-plus-some-HVAC backup needs. The 10C also stacks cleanly with existing 5P units for homeowners who want to mix capacities — you can have one 10C plus two 5Ps for 20 kWh total.
What's not to like
The 10C is slightly less efficient than the 5P (95% vs 96% round-trip), a function of the higher per-unit output and the thermal management that requires. It's also physically larger and heavier — about 1.4× the volume and 1.5× the weight of the 5P. For most homeowners this is a non-issue, but if you have a tight installation space (small utility closet, narrow garage wall), the 5P remains the better choice.
Pricing per kWh is slightly worse than the 5P: $980–$1,120/kWh for the 10C vs $960–$1,120/kWh for the 5P. The 10C's value proposition is the convenience and lower installed cost of a single unit, not better $/kWh economics.
When can you buy one?
Enphase announced shipments begin July 2026. Initial allocations will go to Enphase's largest certified installer partners; broader availability is expected by September 2026. Pre-orders are open through Enphase's installer portal.
Updated in our buyer's guide (coming soon)
We'll add the IQ Battery 10C to our best home batteries of 2026 comparison once we have hands-on test data — likely in Q3 2026. For now, the 5P remains our "best modular" pick, and the 10C is positioned as Enphase's answer to the Tesla Powerwall 3 in the single-unit-whole-home-backup category.
If you're considering Enphase and your install timeline is flexible (post-August 2026), it may be worth waiting for the 10C. If you need storage sooner, the 5P remains an excellent product that will continue to be supported and warrantied for the full 15-year term.
Posted in Product Launch · Tagged: Enphase, IQ Battery, Product