Calculations
Run preliminary calculations for electrical installations yourself. Each tool shows its steps, assumptions and sources; no contact details are required.
Electrical and Protection
Solar and Storage
Power and Energy
- Power–Current and kW–kVACurrent from power, apparent and reactive power; efficiency for mechanical output.
- Power Factor CorrectionTheoretical capacitor power (kvar) from present and target power factor.
- Transformer Rated Current and LoadingRated current for the selected winding voltage and loading from measured load.
- Energy Consumption and Approximate CostkWh consumption from an equipment list and approximate cost at your unit price.
Results are a preliminary engineering assessment based on your inputs and the assumptions shown. They do not replace a design, product selection or compliance approval.
Voltage Drop
Enter the circuit length, load, conductor type and cross-section to get the voltage drop and the load-end voltage.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- Single-phase: ΔU = 2·L·I·(R cosφ + X sinφ); three-phase: ΔU = √3·L·I·(R cosφ + X sinφ); DC: ΔU = 2·L·I·R.
- Conductor resistance is calculated from the cross-section and conductor type at 70 °C; reactance is taken as 0.08 Ω/km.
- The momentary drop during motor starting is not included.
- Schneider Electric — Calculation of voltage drop in steady load conditions
- Schneider Electric — Maximum voltage drop limit
Cable Size and Breaker Selection
Enter the load, circuit length and cable type to get a suitable cross-section and breaker rating. Standard installation conditions are assumed.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- The cable is assumed clipped to a wall or on a tray in a single layer (IEC 60364-5-52 reference method C), 30 °C ambient, with no other circuits alongside.
- Current capacities come from the IEC 60364-5-52 simplified table; the breaker is chosen from standard ratings with Ib ≤ In ≤ Iz.
- If no drop limit is entered, 3% is used.
- Other conditions (buried, in conduit, crowded trays) and short-circuit and selectivity checks are done separately at design stage.
- Schneider Electric — Recommended simplified approach for cable sizing (IEC 60364-5-52)
- Schneider Electric — Calculation of voltage drop in steady load conditions
Rooftop Solar, Panel and Battery Calculation
Calculates separately how many panels fit on the roof by area and how much installed power the consumption target needs, estimates annual yield with PVGIS data, and for battery options sizes battery energy from critical loads.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- Y = 1,500 kWh/kWp per year in the example values is arithmetic only; it is not real İzmir data.
- The PVGIS query uses c-Si modules, fixed mounting and your tilt/azimuth/loss for 1 kWp.
- If the manufacturer states usable capacity, DoD is not applied a second time.
- European Commission JRC — Getting started with PVGIS 5
- European Commission JRC — PVGIS grid-connected and off-grid tools
- U.S. DOE — Solar integration: inverters and grid services
- U.S. DOE — Solar and resilience basics
Power–Current and kW–kVA Conversion
Calculates current, apparent and reactive power from power. On its own this tool does not select a generator, motor protection or cable.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- Sinusoidal steady state and balanced load are assumed; the Q expression does not generalise to harmonic conditions.
- For three-phase the voltage entered is line-to-line.
- Efficiency is applied only when mechanical output power is entered.
- Schneider Electric — Definition of power factor
Power Factor Correction Requirement
Calculates the theoretical capacitor requirement at one operating point. The result is not a selection of fixed capacitors, steps, reactors or a panel.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- Sinusoidal, inductive load and a single operating point are assumed.
- Variable load and harmonics must be assessed separately.
- Reactive energy charges and tariff limits are not included.
- Schneider Electric — Electrical Installation Guide: Theoretical principles to improve power factor
Transformer Rated Current and Loading
Calculates the rated current of the selected winding of a three-phase transformer and the loading from the entered load. Calculate the MV and LV sides separately with their own voltages.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- Balanced three-phase load at rated voltage is assumed.
- The result is not an approval for continuous loading.
Energy Consumption and Approximate Cost
Calculates energy consumption from an equipment list and an approximate cost at the unit price you enter. Nameplate power is not the same as actual average power; enter measured or estimated average electrical input power.
Result
Enter values and press “Calculate”. The result, calculation steps and assumptions will appear here.
Sources and assumptions
- E = kW × qty × hours/day × days. Average electrical input power is used.
- No tariff data or fixed price is used; you enter the unit price.
Let’s assess your facility’s needs together.
Contact us about a problem in your existing facility, a planned capacity increase or a new investment, and we will clarify the requirement together.