up to 18 kWh usable · 10.5 kW continuous · 88% round-trip · 10-year warranty · NMC
A modular 9 to 18 kWh system tied to Generac's backup ecosystem, and one of the few mainstream home batteries still using NMC rather than LFP, which is a real safety and longevity trade for a unit bolted to your wall.
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: system round trip. 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 2026-07-01. 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.