up to 18 kWh usable · 10.5 kW continuous · 88% round-trip · 10-year warranty · NMC
Specs verified against the manufacturer datasheet
A modular 9 to 18 kWh AC-coupled system tied to Generac's backup ecosystem. Its spec guide prints the battery chemistry as NMC (lithium nickel manganese cobalt), the only NMC datasheet in our set.
Best for: generator-brand backup ecosystem
Figure - Specs to scalebars vs the largest in our database
Specifications
Chemistry
NMC
Usable capacity
up to 18 kWh
Continuous power
10.5 kW
Peak power
Not published
Round-trip efficiency
88%
Depth of discharge
Not published
Warranty
10 years or 7.56 MWh throughput per module
Scalable to
9 to 18 kWh per cabinet; two cabinets reach 11.5 kW and up to 36 kWh
Backup scope
Whole-home capable
Inverter
Integrated
Weight
443 lb
Dimensions
23 x 10.75 x 70 in
Efficiency basis: roundtrip efficiency, basis not stated. Round-trip numbers are only comparable across brands when measured the same way, so read the basis before comparing.
Source: Generac PWRcell 2 spec sheet, Jul 2025. Specs verified 2026-10-01. Figures are per single unit at beginning of life; confirm the current datasheet with your installer.
Specs do not tell you if it pays off.
Payback depends on your rate plan, usable capacity, and local incentives, not the brand on the box.
Warranty terms, chemistry and round trip efficiency across the batteries we track are summarized in our home battery statistics.