The eVault Max 18.5 is one of the largest single residential LFP batteries available, with full 100 percent depth of discharge and a 10 year, 8,000 cycle warranty, and it scales to 370 kWh. It is a DC storage module only, so its 9.2 kW continuous and 12 kW peak ratings assume a properly sized paired inverter, and the published 98 percent figure is a cell efficiency at 0.5C, not a certified AC round trip number.
Best for: Large-capacity residential and light-commercial backup that needs to scale
Figure - Specs to scalebars vs the largest in our database
Specifications
Chemistry
LFP
Usable capacity
18.43 kWh
Continuous power
9.2 kW
Peak power
12 kW
Round-trip efficiency
98%
Depth of discharge
100%
Warranty
10 year warranty, rated for 8,000 cycles at 80 percent depth of discharge
Scalable to
Up to 370 kWh, 20 modules in parallel
Backup scope
Whole-home capable
Inverter
Needs a separate inverter
Weight
520 lb
Dimensions
20.3 x 20.3 x 42.2 in
Efficiency basis: Datasheet lists 98 percent efficiency measured at 0.5C, which is a cell-level charge and discharge figure and not a full AC round trip rating. Round-trip numbers are only comparable across brands when measured the same way, so read the basis before comparing.