N+1
A component group or capacity arrangement with N units required for the declared design load plus one spare unit. N+1 describes provisioned capacity, not guaranteed tolerance of every failure or maintenance event or an availability outcome.
Current numbers
33 kWAdvanced Energy ORV3 HPR shelf at 50 V nominal: 33 kW N+0, 27.5 kW N+1, 16.5 kW N+N
72 kW (60 kW at N+1)OCP ORV3 HPR V2 shelf spec (Meta, 1.0.0): six 12 kW PSUs, 72 kW, 60 kW at N+1, 1 OU