Free · Energy scenarios
Daily Wind-Electricity Receipts Minus Entered Cost
Calculate daily energy receipts minus a cost charged to the same comparison, using known daily energy or constant-wind estimation.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
windTurbineProfit ≈ -49985.000.
Daily balance = daily generated energy × electricity price − entered cost; estimated daily energy = ½ρAv³η × 24 / 1000 kWh.
Worked example
Enter these known values and leave the other values blank.
- Enter known daily energy
- Generated daily electricity
- 100 kWh / day
- Price of electricity
- 0.15 USD / kWh
- Cost charged to this comparison
- 50000 USD / day
- Daily receipts minus entered cost
- -49985 USD / day
Assumptions and limitations
- The energy control is daily energy, although the captured name refers to power. A kWh is energy, not kW of power.
- The balance subtracts the entire entered cost from one day’s electricity receipts. If the cost is turbine capital expenditure, this is a one-day receipts-minus-capital comparison; it is not annual profit or a payback estimate.
- The estimation branch assumes constant wind speed, density, swept area and coefficient through a full day. The coefficient is an ideal power extraction fraction and is bounded by 16/27.
- Cost inputs are scenario values. Currency conversion choices retain the captured exchange snapshot, rather than live exchange rates; enter all costs in one currency for an internally consistent comparison.
- The calculation assumes the entered operating conditions are constant for the stated comparison period. It does not predict weather, site suitability, construction performance, taxes, financing or maintenance.
- Keep known inputs fixed with locks; clear the unknown before solving an inverse. Singularity or insufficient known inputs can leave results incomplete.
Common questions
Are the outputs a site-specific forecast?
No. They apply the stated algebraic model to supplied conditions. A real installation or building needs measured operating data and a broader engineering or cost assessment.
How are currency choices handled?
They use a fixed captured conversion snapshot. They do not retrieve current prices or exchange rates.
References
Bookify adds explicit model-domain checks: The constant-wind power coefficient must be positive and cannot exceed exactly 16/27.