KRC LABS energy
Transparent engineering calculations for energy decisions
Enter your inputs and see an approximate result together with its assumptions and sources. The calculators support pre-feasibility work; they do not replace a detailed project design.
Modules
Every module states which formula, which assumptions and which sources it uses.
Solar
Rooftop solar sizing, annual yield and payback.
Rooftop PV
Installed capacity from roof area and module data, approximate annual yield and simple payback period.
Open calculator: Rooftop PV →
Reactive
Reactive energy ratio check and power factor correction.
Reactive power
Check the reactive-to-active energy ratio against the limits that apply to you, and estimate the compensation power.
Open calculator: Reactive power →
Electrical basics
Quick calculations for current, power conversion, appliance consumption and motor power.
Three-phase current
Line current, kVA and kVAr from kW, line voltage and power factor.
Open calculator: Three-phase current →Single-phase current
Current drawn by a single-phase load from kW, voltage and power factor.
Open calculator: Single-phase current →kW ↔ kVA
Convert kW to kVA or kVA to kW with the power factor, including kVAr.
Open calculator: kW ↔ kVA →Amps → kW
Active and apparent power from measured current, voltage and power factor.
Open calculator: Amps → kW →Appliance consumption
Approximate kWh from appliance power and usage time, with optional cost.
Open calculator: Appliance consumption →Motor input power
Electrical input power and losses from shaft power and efficiency.
Open calculator: Motor input power →
Coming soon
Bill and tariff
Coming soonApproximate comparison of electricity bill items and tariff options.
Heat pump
Coming soonApproximate running cost from COP and seasonal performance.
Energy storage
Coming soonApproximate battery sizing and self-consumption share.
How to read the results
All results are approximate. Actual yield, consumption and cost typically vary with the site, the equipment, operation and current regulations. An on-site survey and a project calculation are needed before an investment decision.