What is a good critical power?

You should execute your easy run between 159 – 196 W. The range represents and upper and lower boundary of the zone. You should find an effort that feels easy and the number that works for you.

What is modular vs non modular UPS?

Conventional UPS systems take up more space due to the fact they are typically extended horizontally on the floor. The modular UPS typically increases typically vertically in the rack. Thereby using less floor space. Secondly, less UPS batteries need to be used if the conventional UPS has separate battery cabinets.