What is the least expensive UPS configuration generally referred to as?

The least expensive UPS configuration is referred to as a 1N Tier 1 configuration. This type of configuration involves a single, non-redundant UPS system that can adequately support the connected load. In a 1N configuration, there is one UPS unit providing power to the load, without any additional backup or redundancy built into the system, making it a cost-effective solution for environments where budget constraints are a significant factor and where high availability is not as critical.

In contrast, configurations like N+1 introduce an additional unit to provide redundancy, thereby increasing the initial investment required. Redundant systems setup implies multiple units working together to ensure power quality and reliability, which further raises costs. Meanwhile, hot-swap configurations allow maintenance or replacement without downtime, also leading to added complexity and expense. Thus, the 1N configuration remains the most straightforward and economical choice for basic power needs.