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Aquaponic System Energy Cost Estimator

This estimator converts an aquaponic system's average electrical load and operating schedule into monthly electricity use and cost. It is intended for pumps, aeration, filtration, lighting, heating, cooling, and controls when their combined demand can be represented by a reasonable average kilowatt load.

Use it to compare operating schedules, test electricity-rate scenarios, or build a recurring cost assumption for production planning. Because motors, heaters, chillers, and lights often cycle, nameplate wattage alone may overstate actual use; an average measured load from a meter will usually produce a better estimate.

Inputs

kW
hours
days
$/kWh
Result
—
USD/month
Monthly energy use—
Average daily energy—

1. Enter average electrical load
Use measured or duty-cycle-adjusted kilowatts when possible instead of simply adding maximum nameplate ratings.

2. Set the operating schedule
Enter the equivalent operating hours per day and number of operating days in the month.

3. Enter the energy rate
Use the electricity price per kilowatt-hour that applies to the energy portion of your bill.

4. Review energy use
Check the calculated monthly kWh before relying on the cost estimate.

5. Review monthly cost
Use the result for scenario comparison and add demand or fixed utility charges separately when they apply.

Monthly energy = Average load × Hours per day × Operating days
Monthly cost = Monthly energy × Electricity rate

Where:

  • Average connected load: entered in kW
  • Operating time per day: entered in hours
  • Operating days per month: entered in days
  • Electricity rate: entered in $/kWh

Assumptions: inputs describe the same system, batch, or planning period, and units are used exactly as labeled. The model is intentionally simple and does not add unentered losses, fees, or biological effects.

What the result means

The main result estimates the electricity expense for one month under the entered average load and schedule.

Demand charges, fixed utility fees, time-of-use pricing, and fuel used by non-electric equipment are not included.

Given:

  • Average load = 4.2 kW
  • Operating time = 18 hours/day
  • Operating days = 30
  • Electricity rate = $0.145/kWh

Calculation:
Energy = 4.2 × 18 × 30 = 2,268 kWh; Cost = 2,268 × $0.145 = $328.86

Result:
Estimated monthly energy cost = $328.86

Interpretation:
The entered operating profile uses about 2,268 kWh per month and costs about $329 at the stated energy rate.

Should I use equipment nameplate power?

Only if it represents the actual average load during the entered hours. Metered demand or a duty-cycle-adjusted average is usually more representative for equipment that cycles.

Does the result include utility demand charges?

No. The model multiplies kWh by an energy rate and does not separately calculate peak-demand, fixed, or power-factor charges.

How should I handle different equipment schedules?

Convert each group to a daily kWh total and derive an equivalent average load, or calculate the groups separately and add the costs. A single run-time input works best when the combined load is already averaged.

Can I use this for annual budgeting?

You can repeat the estimate with month-specific loads, schedules, and rates. Simply multiplying one month by twelve may miss seasonal heating, cooling, lighting, or tariff changes.

Why can the estimate differ from the electricity bill?

Bills can include taxes, demand charges, tiered rates, time-of-use pricing, fixed fees, and load variation that are not captured by a simple kWh calculation.