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Hydroponic Nutrient Energy Cost Estimator

The Hydroponic Nutrient Energy Cost Estimator calculates electricity consumption and cost for a hydroponic production period by combining lighting power, pump and auxiliary power, their daily operating hours, number of days, and electricity price. It is useful for crop-cycle budgeting when the major electrical loads can be represented directly in kilowatts.

Lighting and pump or auxiliary loads are entered separately because their schedules often differ. The calculator multiplies each power value by its own runtime, adds the daily kilowatt-hours, then scales the total across the production period. This provides a clear energy baseline for scenario comparison, such as testing a different photoperiod or pump schedule. The model does not include demand charges, standby loads not entered, equipment power variation, heating or cooling unless included in the auxiliary kW, or time-of-use electricity pricing.

Hydroponic electrical loads

kW
h/day
kW
h/day
days
$/kWh
Result
—
estimated hydroponic electricity cost
Total energy use—
Lighting energy—
Pump + auxiliary energy—
Average cost per day—

1. Enter lighting power
Use total electrical lighting input in kilowatts for the crop area included in the estimate.

2. Set lighting runtime
Enter the average daily photoperiod or powered lighting hours.

3. Enter pump and auxiliary load
Combine pumps and other included electrical loads that share the runtime entered in the next field.

4. Set auxiliary runtime
Use the average hours per day that the pump and auxiliary load operates.

5. Choose production days and price
Enter the crop-cycle length and the electricity energy charge per kWh.

6. Review the cost split
Compare lighting kWh with pump and auxiliary kWh to see which entered load drives the total.

Lighting energy = Lighting kW × Lighting hours/day × Days Pump/auxiliary energy = Pump/auxiliary kW × Runtime hours/day × Days Total energy = Lighting energy + Pump/auxiliary energy Cost = Total energy × Electricity price per kWh

What the result means

The result is the energy-charge estimate for the entered hydroponic electrical loads over the selected production period.

Include HVAC, dehumidification, water treatment, or other equipment only if their power is intentionally included in the entered loads; tariff demand charges are not modeled.

Given: 10.5 kW lighting for 17 h/day, 2.2 kW pumps/auxiliaries for 24 h/day, 42 days, and $0.13/kWh.

Calculation: Lighting energy = 10.5 × 17 × 42 = 7,497 kWh. Pump energy = 2.2 × 24 × 42 = 2,217.6 kWh. Total = 9,714.6 kWh. Cost = 9,714.6 × $0.13 = $1,262.90.

Result: Estimated electricity cost: $1,262.90.

Lighting contributes about 77% of the modeled energy use in this scenario.

Should LED fixture wattage be entered as rated or measured power?

Use actual electrical input when you have reliable measured or manufacturer data for the operating condition. The cost calculation depends on electrical kW, not light output.

Can pumps with different schedules be combined?

Only if the combined kW reasonably shares one average runtime. Otherwise, calculate separate scenarios or convert each device to daily kWh and combine them outside this simple two-load model.

Does the calculator include cooling caused by grow lights?

No. Cooling or dehumidification energy must be included in the auxiliary load or estimated separately.

What if my electricity price changes by time of day?

A single blended $/kWh rate is used. For time-of-use pricing, calculate each tariff period separately and add the costs.

How can I compare two crop schedules?

Keep the same equipment assumptions, change runtime or production days for each scenario, and compare both total kWh and dollars so price and energy effects remain visible.