Estimates annual electrical energy consumption for a single traction elevator by splitting the day into running time (motor drawing power to move the car) and standby/idle time (controller, lighting and brake-hold power draw while parked), then scaling by trips/day and operating days/year — a simplified preliminary estimate, structured the same way as ISO 25745-2's running-energy-plus-standby-energy method.
Standards followed
ISO 25745-2 (Energy calculation and classification for lifts) — structural method (running energy + standby energy) followed here as a simplified preliminary estimate, not a full standard-compliant classification, which requires manufacturer-measured motor and standby power per the standard's test procedure.Standard elevator-engineering motor power formula (net unbalanced load × speed ÷ drive efficiency) — same relation used in the Elevator Electrical Demand calculator.
What it can do
- Running power per trip from rated load, speed, counterweight balance factor and drive efficiency.
- Energy per trip, with an optional regenerative-drive credit (energy recovered on counterweight-heavy descents).
- Daily running energy, standby energy for the remaining idle hours, and their sum.
- Annual energy consumption from operating days per year.
Example problem
1000kg rated load, 1.5 m/s speed, 50% counterweight balance, 70% drive efficiency, 25s average run time/trip, no regen credit, 150W standby, 150 trips/day, 365 operating days/year.
- Net unbalanced load = 1000 × (1 − 0.50) = 500kg.
- Running power = 500 × 9.81 × 1.5 / (1000 × 0.70) = 10.511kW.
- Energy/trip = 10.511 × (25/3600) × (1 − 0) = 0.0730kWh.
- Daily running hours = 150 × 25/3600 = 1.042h; daily running energy = 150 × 0.0730 = 10.95kWh.
- Standby hours = 24 − 1.042 = 22.958h; standby energy = 0.150 × 22.958 = 3.44kWh.
- Daily total = 10.95 + 3.44 = 14.39kWh; annual = 14.39 × 365 ≈ 5,253kWh/year.
≈5,253 kWh/year.
This is a preliminary planning estimate, not a substitute for manufacturer-measured energy data or a full ISO 25745-2 classification. The regenerative-drive credit is a simplified flat percentage reduction on running energy — actual regeneration depends on the specific drive's ability to return energy to the supply and on real trip load/direction patterns. Standby power varies significantly by controller technology (LED vs fluorescent car lighting, sleep-mode controllers, etc.) — use the manufacturer's published standby figure where available.