Real estate developers & building services

Demand = units × kW per unit × simultaneity + common-services demand. Apply the entered reserve, then divide by power factor for kVA.

Example inputs

• Number of units: 20
• Connected load per unit: 5 kW
• Unit simultaneity: 60 %
• Common services demand: 15 kW
• Future allowance: 20 %
• Power factor: 0.9
• Three-phase voltage: 415 V

Example result

• Present demand: 75 kW
• With future allowance: 100 kVA
• Balanced line current: 139.12 A

Assumptions & limits

• Common services are added after unit simultaneity, without further diversity.
• User-entered simultaneity is a scenario assumption, not a regulatory coefficient.
• Verify phase balance, utility requirements, actual load schedules and protective-device design.
• Preliminary planning only. Final selection needs project-specific engineering verification.

Technical reference: Schneider Electric: power loading of an installation. This reference does not certify the website calculation or an NPE assembly.

Example inputs

• Connected load: 250 kW
• Generator phase: 3Φ (three phase)
• Power factor: 0.8
• Diversity factor: 80 %
• Largest motor: 30 kW
• Altitude: 1700 m
• Ambient temperature: 30 °C

Example result

• Required capacity: 313 kVA
• Standard set: 350 kVA
• Output current: 487 A

Assumptions & limits

• Generator: 350 kVA prime/standby, 3Φ balanced at 415 V
• Design power factor: 0.8
• Step load acceptance should be confirmed against the alternator curve
• Nairobi sits near 1,700 m, so altitude derating is applied by default.
• Preliminary planning only. Final selection needs project-specific engineering verification.

Example inputs

• Simultaneous peak AC load: 5 kW
• AC load power factor: 0.9
• Daily consumption: 12 kWh
• Peak sun hours: 5.5 h
• Panel wattage: 550 W
• Days of autonomy: 1
• Inverter: 1Φ (single phase)
• Storage chemistry: Lithium — 85 % usable

Example result

• Array size: 2.8 kWp
• Panels required: 6
• Indicative inverter class: 8 kVA

Assumptions & limits

• Hybrid inverter: 8 kVA, 1Φ single phase
• System losses assumed: 22 % (soiling, temperature, wiring)
• Peak sun hours: 5.5 h/day
• Inverter class considers entered simultaneous peak load and load power factor. Verify motor surge, overload duration, PV input limits and manufacturer ratings separately.
• Preliminary planning only. Final selection needs project-specific engineering verification.

Example inputs

• Room length: 12 m
• Room width: 8 m
• Mounting height above work plane: 2.2 m
• Target illuminance: 500 lux — office / workshop
• Lumens per fixture: 4000
• Watts per fixture: 36 W
• Circuit: 1Φ (single phase)

Example result

• Fixtures required: 27
• Connected load: 972 W
• Circuit current: 4.05 A

Assumptions & limits

• Room index (K): 2.18
• Utilisation factor: 0.57 · maintenance factor: 0.8
• Glare: keep UGR below 19 for office and screen-based work
• Preliminary planning only. Final selection needs project-specific engineering verification.

Example inputs

• Connected charge points: 8
• Maximum power per charge point: 7.4 kW
• Site active-power limit: 100 kW
• Other simultaneous site demand: 60 kW
• Configured EV power cap: 30 kW

Example result

• Connected charging power: 59.2 kW
• Site headroom: 40 kW
• Managed EV allocation: 30 kW

Assumptions & limits

• EV allocation = min(connected power, max(0, site limit − other demand), configured EV cap).
• All limits are active power in kW, not kVA. The equal-share illustration assumes every connected point requests power.
• This is a snapshot: building demand and vehicle acceptance change over time.
• Verify phase loading, minimum charging current, metering, controller communications and fail-safe behaviour. A low allocation may require queued or paused sessions; it does not guarantee every vehicle can charge.
• This does not size cables, protection, service capacity or certify charger compatibility.
• Preliminary planning only. Final selection needs project-specific engineering verification.

Method reference: Schneider Electric — EV charging management systems