List the equipment that must stay online
Separate essential systems from loads that can stop or wait. A branch office may need its router, switches, workstations and access control, but not every kitchen appliance or air conditioner. A production site may need control electronics protected separately from large motors.
Record each load's normal and peak demand, supply phase and tolerance for interruptions. Measurements across a representative operating period are more useful than adding the maximum labels on equipment that never runs together.
Check two power limits, not one
A UPS has an apparent-power rating in kVA and an active-power rating in kW. The proposed load must fit within both. Do not assume a 10kVA model can supply 10kW: the manufacturer's output rating determines that limit.
An engineer should also consider overload duration, crest factor, sudden load steps, phase balance and any derating for environmental conditions. Capacity remaining during a redundant-unit outage matters when continuity depends on N+1 operation.
Size runtime as a separate requirement
Decide what the battery reserve must achieve: bridge generator start-up, permit an orderly shutdown or carry the operation through a longer outage. Two UPSs with the same kVA rating can deliver very different autonomy because their batteries differ.
Assess the recharge window as well as discharge duration. If outages repeat before the batteries recover, a design that covers one interruption may not cover the next. Confirm runtime against the proposed load and the manufacturer's discharge data.
Turn the estimate into a site-specific selection
Powermode's S-Series, I-Series and Rugged range address different power and application requirements. The final choice also depends on the available supply, electrical distribution, installation space, battery compatibility and future servicing.
Bring a load list, current UPS information, required autonomy and expected expansion to the assessment. A useful recommendation should state the assumptions, capacity, battery configuration and commissioning checks, not simply name a larger UPS.
Planning guidance, not an installation specification. Final sizing, compatibility and safe work procedures require a site-specific assessment and the relevant manufacturer's instructions.