FranklinWH aPower 2

Estimates from our installed-cost tiers put a FranklinWH aPower 2 at roughly $10,500 to $19,500 installed, with $15,000 typical. These are turn-key installed figures (equipment + labor + permitting), not equipment-only prices.

15 years or 60 MWh throughput, with a 70% capacity retention floor (franklinwh.com end-user limited warranty). The aGate controller carries a separate 5-year warranty.

AC-coupled, so it works with existing third-party solar without replacing any of it - the most retrofit-native option in this set. Our retrofit guide walks through the compatibility decision.

No. The residential Section 25D credit expired December 31, 2025, so an owned battery purchased in 2026 gets $0 federal credit. The commercial Section 48E credit only covers third-party-owned (lease/PPA) projects with a construction start before July 4, 2026 (rolled to Monday July 6 under IRC 7503) - that deadline has passed, so only grandfathered projects keep it. State incentives such as CA SGIP, MA ConnectedSolutions, the IL rebate, and NC PowerPair ($400/kWh) are still live: see our state battery rebate guide.

Units are stackable up to 225 kWh (15 aPower 2 units). At 30 kWh/day of average US usage, a fully stacked system carries a whole home for days, not hours.

The 15-year coverage ends early if you cycle the battery hard: the limit is 60 MWh of total throughput, with a 70% capacity retention floor. Heavy daily cycling (for example aggressive time-of-use arbitrage) burns throughput faster than occasional outage backup.