"75mins saved hims 75%"
In that post, I mentioned how in many cases the need for a 4 wire or "split phase" UPS is unnecessary if all you need is 120volt outlets. (Better to buy a step down transformer or re-evaluate your low voltage needs)
The only application where a split phase UPS is useful is when connecting to a panel. Your electrical panel, either 120/240 or 120/208v is a 4 wire system. Two wires carrying current called "hots", a ground, and a neutral. But nearly every UPS is a 3 wire system (2 hots +G), which causes a problem
The solution in most cases, is to add a transformer (xf5iso) that outputs a fixed neutral creating 4 wires (2 hots + N + G).
However, a more expensive option is to buy a UPS that has the separate neutral system built in to its 3U frame. These Smart UPS RTD-P units take in 4 wires and output 4 wires.
We finally have our first one and while it is still expensive, its just a bit more than buying the transformer separately. The 693p3.
