What is N+1 redundancy in a DC power system?

[N+1 redundancy DC power system · hot swap rectifier] Sizing the rectifier complement so total load plus battery recharge current can still be carried with one module out of service. Combined with hot-swappable modules, it means a rectifier can fail or be replaced without dropping the DC bus. It is the standard resilience requirement in telecommunications, rail and utility DC systems, and it is a specification to state explicitly rather than assume.