Facility Load Inputs
Enter expected connected equipment and realistic operating assumptions. Inputs are planning values. Use nameplate data whenever possible.
Example Data Table
This sample uses the default values shown in the calculator.
| Load group | Planning input | Demand treatment | Purpose |
|---|---|---|---|
| Lighting | 40 fixtures × 600 W | 100% | Primary plant lighting load |
| HVAC and dehumidification | 15,000 W | 100% | Temperature and humidity control |
| Support equipment | 8,200 W | 85% | Pumps, fans, receptacles, and other loads |
| Design allowance | 125% continuous, 20% reserve | Applied after diversity | Planning capacity and expansion |
Formula Used
The program separates connected equipment from diversified operating demand. It then applies capacity allowances and converts the result into feeder current.
How to Use This Calculator
- Choose the service phase and feeder line voltage.
- Enter a realistic power factor for the equipment mix.
- Enter fixture count and actual fixture input wattage.
- Add HVAC, pumps, fans, receptacles, and specialty equipment.
- Set demand factors based on equipment that can operate together.
- Apply continuous-load treatment and expansion reserve as required.
- Enter the panel rating for a quick capacity comparison.
- Add operating hours, monthly days, and energy rate for cost planning.
- Review the calculated feeder current and recommended panel size.
Cultivation Electrical Planning Essentials
Indoor cultivation facilities can have dense electrical loads. Lighting often drives the first equipment schedule. HVAC and dehumidification can match or exceed that load. Pumps, fans, controls, and process equipment also matter. Planning should begin with accurate nameplate ratings.
Connected load shows every installed device at full power. It is useful for equipment inventory. It does not always represent normal simultaneous operation. Demand factors estimate the portion that can run at one time. Use conservative values when schedules overlap.
Lighting schedules are important. Many facilities operate lighting for long daily periods. That can create continuous-load concerns. HVAC may also run for extended hours. Apply the correct multiplier for your jurisdiction and equipment condition. Do not assume all loads receive identical treatment.
Power factor changes the current requirement. Loads with motors, drivers, and electronic controls can have a lower power factor. Lower power factor increases feeder current for the same wattage. Use manufacturer data when it is available. A poor estimate can understate distribution capacity.
Three-phase systems usually carry larger facility loads efficiently. The calculator uses the square-root-of-three relationship for three-phase current. Single-phase service uses a different calculation. Confirm the voltage type before selecting equipment. A mismatch can produce a misleading amp result.
Reserve capacity supports future expansion. Grow rooms can change quickly. Higher fixture wattage, added dehumidification, or new process equipment can outgrow a panel. A reasonable reserve helps reduce costly upgrades. It does not replace a detailed load study.
Monthly energy estimates help with operating budgets. The estimate uses diversified demand and planned runtime. It is not a utility bill forecast. Demand charges, time-of-use pricing, startup loads, and seasonal HVAC changes can alter actual costs. Use utility data for a detailed budget.
Panel utilization deserves attention. A panel near its rating leaves little room for controls, troubleshooting, or future circuits. A lower utilization target can improve flexibility. It can also reduce nuisance trips when conditions change. Review breaker space as well as amp capacity.
Electrical safety should guide every decision. Moist environments need suitable equipment and careful installation. Ground-fault protection, bonding, disconnects, and emergency procedures may be required. Local rules can differ. Coordinate the final design with licensed professionals and the authority having jurisdiction.
Use the calculator to screen options early. Then document final loads, schedules, and equipment data. Use qualified professionals for safe, code-compliant final installation decisions.
Frequently Asked Questions
1. What does connected load mean?
Connected load is the total nameplate wattage of all listed equipment. It assumes every device operates at full output. It helps document installed capacity. It can be higher than the normal operating demand.
2. Why use demand factors?
Demand factors reflect equipment that may not run together. They help create a realistic operating estimate. Use them carefully. Some cultivation loads, especially lighting and HVAC, may overlap for long periods.
3. What power factor should I enter?
Use manufacturer data when possible. A value near 0.90 is a planning starting point for mixed electronic and motor loads. A lower value increases the calculated feeder current.
4. Does this select conductors or breakers?
No. It estimates electrical demand and current only. Final conductor and breaker selection needs code rules, temperature ratings, conduit fill, voltage drop, equipment listings, and a qualified review.
5. Why is a 125 percent multiplier included?
Some continuous loads require added capacity under applicable electrical rules. The multiplier is adjustable because the correct treatment depends on local code, equipment duty, and design conditions.
6. Is HVAC load always continuous?
Not always. HVAC duty depends on climate, room conditions, control strategy, and equipment cycling. Use measured or manufacturer-supported operating assumptions. Apply code requirements through the final electrical design.
7. How is monthly energy calculated?
The calculator multiplies diversified operating demand by daily runtime and days per month. It estimates energy consumption. It does not include utility demand charges or time-of-use pricing.
8. Can I use this for multiple grow rooms?
Yes. Combine loads that share the same feeder or panel. Use demand factors that reflect overlap among room schedules. Separate calculations may be clearer when rooms have different operating hours.
9. What does panel utilization show?
Panel utilization compares calculated design current with the selected panel rating. Values above 100 percent indicate insufficient nominal capacity. Lower values preserve operating and expansion flexibility.
10. Should I add future capacity reserve?
Usually, yes. Cultivation facilities often add fixtures, dehumidifiers, controls, or processing equipment. A reserve can avoid an early panel replacement. Choose a value that fits the development plan.
11. Is this result suitable for permit drawings?
No. Treat it as a preliminary planning result. Permit drawings need a complete site-specific load calculation. Use qualified professionals for safe, code-compliant final installation decisions.
Planning estimates do not replace site-specific engineering, code analysis, or inspections.