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PLEX — Power Load EXaminer
PLEX
v2.72 — Power Load EXaminer

Power, UPS & Cooling Planning for ICT and Security Systems. Tell me what you’re building and I’ll help estimate power, UPS, generator, PoE, and cooling requirements.

► Watch a quick overview on YouTube
ⓘ Best viewed on a PC or tablet.
PLEX calculates power, UPS, generator, and cooling loads for telecom rooms and equipment rooms — built from the real devices you plan to install. Add equipment from the library or enter custom loads, review the full load summary, then export a portable .plex project file or print a design report.
PROJECT MATURITY
POWER SCHEDULE TITLE
GLOBAL SETTINGS
POWER FACTOR
AMBIENT HEAT GAIN
UPS PLANNING SETTINGS ▼
DEMAND FACTOR
GROWTH FACTOR
MAX LOAD % TARGET
INVERTER EFF. %
UPS MODEL PRESET
Battery Wh is manufacturer-published at full load. Actual runtime varies with load, temperature, and battery age. Verify with manufacturer runtime chart.
UPS TYPE
RUNTIME TARGET (MIN)
ADD FROM LIBRARY
Dual PSU: Redundant power supplies share the load — total draw is unchanged.
ADD CUSTOM DEVICE
WATTS
U (opt.)
QTY
VOLTAGE
PLACEMENT
TOTAL WATTS
0 W
0 VA
HEAT LOAD
0 BTU/hr
0.00 tons
GENERATOR
0.0 kW
@ 1.25× continuous
UPS LOADN/A
RACK SETTINGS
RACK LABEL
RACK SIZE (U)
PDU INPUT VOLTAGE
REDUNDANCY
RACK NOTES
LEVEL / FLOOR
OUTLET TYPE
CIRCUIT # / PANEL
RACK DEVICEQTYW/UNITVUTOTAL W
No devices in this rack yet.
🔧 WALL / FIELD DEVICES — INDEPENDENT CIRCUITS
DEVICEQTYW/UNITVTOTAL WAMPSBREAKERNOTES
No wall/field devices yet. Add ACS power supplies, controllers, locks, or DAS/EERC.

PLEX Project Summary

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PROJECT INFORMATION
ELECTRICAL LOAD SUMMARY
GENERATOR SIZING
MECHANICAL / COOLING LOAD
Coordination value only — room envelope, ventilation, ambient load, and redundancy not included. Verify with MEP.
WALL / FIELD DEVICES
Independent circuits — outside rack PDU
UPS SIZING & RUNTIME
CIRCUITS & BREAKER SIZING
125% continuous-load factor applied for planning. Circuit amperage at selected PDU voltage and applied power factor. Breaker shown is next standard commercial size above continuous-load current. Verify final circuiting with EOR/AHJ.
PER-RACK BREAKDOWN
POWER CONSUMPTION & CIRCUIT SCHEDULE
  • Power Factor. Default 0.90 applied to all loads. Adjust under Global Settings for known equipment behavior.
  • NEC 125% Continuous Load. Applied for planning — breaker and generator sizing. Final circuiting to be verified and signed off by EOR/AHJ.
  • Wall-Mount Device Wattages. Wattages for wall-mounted devices (ACS controllers, power supplies, locks, intercoms, and field equipment) are reference estimates. Verify actual draw against manufacturer specifications and final hardware selections before design completion.
  • Cooling Load. BTU/hr = Watts × 3.412. Cooling tons = BTU/hr ÷ 12,000. HVAC recommendation includes a 25% buffer.
  • Generator Sizing. Total load × 1.25 (continuous). Growth recommendations show +25% and +50% above continuous.
  • UPS Runtime. Linear estimate from nameplate full-load runtime, scaled by load percentage. Actual runtime varies with battery age, temperature, and load profile.
  • Breaker Selection. Breaker shown is the next standard commercial size at or above calculated continuous-load current. Final breaker and conductor sizing by licensed electrical engineer.
  • Redundant Power Supplies. Total system draw is unchanged — dual PSU equipment shares the load between supplies.
  • Scope. Preliminary planning and coordination only. PLEX does not replace stamped electrical design. All outputs require review and sign-off by a licensed electrical engineer.
THE DUDE
▶Add equipment to see planning guidance.
Preliminary estimates only. Verify with manufacturer data and engineer of record.
PLEX is free to use. Please credit Limited Energy eXperts · limitedenergy.net