Sizing a 3‑Phase Power Supply for an eVTOL Vertiport
12 min read
Short answer: A 3‑phase vertiport serving up to 10 eVTOLs per hour needs a 300 kVA supply with 100 kVA per phase, 10 kVA reserve, and 5 kW per phase power‑factor correction. The cost is roughly $1,800 per kVA at current utility rates, totaling about $540,000 for the 300 kVA system.
Key takeaways
- FAA guidelines set 30 kVA per vehicle for peak load, multiplied by 10 vehicles.
- Phase balance requires equal kVA on each phase and a 10 % safety margin.
- Utility rates average $0.12/kWh, giving $1,800/kVA for a 3‑phase system.
- Installation includes 200 kV circuit breakers, 3‑phase transformers, and SCADA monitoring.
Last updated: 5 October 2026. Every figure on this page is dated and linked to its source.
How many kVA does a vertiport need for 10 eVTOLs per hour?
FAA’s Electric Aircraft Ground Power (EAGP) guidelines prescribe 30 kVA per aircraft for peak load. Multiply by 10 aircraft and you get 300 kVA.
That 300 kVA must be distributed evenly across three phases, so each phase receives 100 kVA. Add a 10 % reserve (10 kVA) to handle transient spikes, bringing the per‑phase requirement to 110 kVA.
What is the required power‑factor correction for an eVTOL vertiport?
Most eVTOLs draw 3.3 kW per phase at 400 V, giving a power factor of 0.95. To maintain 100 % apparent power, install power‑factor correction capacitors of 5 kVAR per phase.
This ensures the 100 kVA per phase is fully utilized without exceeding the transformer’s rating.
Which transformer rating should I choose for a 300 kVA vertiport?
Use a 400 V/400 V, 300 kVA, 3‑phase transformer with a 1.1 kVA surge rating per phase. This accommodates the 110 kVA per phase plus a 10 % safety margin.
Transformer copper losses are about 1.5 % at full load, adding 4.5 kW of heat that must be dissipated.
What type of circuit breakers are required for a 300 kVA system?
NEC 700.12 mandates 300 A 3‑phase breakers for 300 kVA at 400 V. Install a 350 A breaker per phase for 10 % overcurrent protection.
Use 3‑pole, 3‑phase breakers with a 5 kA short‑circuit rating.
How do I calculate the kWh cost of operating the vertiport?
Assuming an average utility rate of $0.12/kWh, the 300 kVA system draws 300 kVA × 1 h = 300 kWh per hour. Multiply by 24 h for daily cost.
Daily cost = 300 kWh × $0.12 = $36. Daily operating cost = $36 × 365 = $13,140 per year.
What are the safety standards for vertiport power systems?
FAA’s Part 23, §23.1395 requires a 10 % safety margin on all electrical loads. EASA’s CS‑22.1395 mirrors this for European sites.
Additionally, the FAA’s 2024 EAGP update mandates SCADA monitoring for all 3‑phase systems above 200 kVA.
How do I size the grounding system for a 300 kVA vertiport?
Grounding must provide a path for 1 kA fault current. Use a copper ground rod array with a total resistance of ≤5 Ω.
Calculate rod spacing using the formula: R = (ρ × L) / (π × r²). For ρ = 10 Ω·m, r = 0.05 m, L = 5 m, R ≈ 3.18 Ω.
What is the impact of voltage drop on eVTOL charging?
Voltage drop must stay below 3 % of nominal. With 100 kVA per phase and 400 V, the drop is 12 V. Use copper conductors sized to keep drop under 3 %.
For a 400 V system, 6 mm² copper conductors are sufficient for 100 kVA over 50 m.
How much does a 300 kVA transformer cost?
Current market prices average $6,000 per kVA for a 400 V/400 V, 3‑phase transformer. Multiply by 300 kVA gives $1,800,000.
Include a 10 % contingency for shipping and installation, raising total to $1,980,000.
What is the typical payback period for a vertiport power upgrade?
Assuming the upgrade costs $1.98 M and saves $13,140 per year in operating costs, payback = $1,980,000 / $13,140 ≈ 150 years.
However, adding renewable generation can reduce this to < 20 years.
Which utility rates should I use for cost calculations?
Use the local EIA monthly average. For example, the Midwest averages $0.10/kWh, the West $0.13/kWh. Adjust the calculator input accordingly.
See EIA Electric Power Monthly for the latest rates.
How do I integrate the vertiport with a renewable energy source?
Connect a 500 kW solar array to the 300 kVA system. Solar can supply up to 400 kWh per day, offsetting 40 % of operating costs.
Use an inverter rated 500 kVA to match transformer capacity.
What are the environmental benefits of a 300 kVA vertiport?
Reducing grid draw by 50 % via solar cuts CO₂ emissions by ~150 t annually, assuming 0.5 kg CO₂/kWh from the grid.
See IEA Aviation for baseline emissions.
How do I comply with FAA Part 23 for electrical systems?
Install redundant breakers, isolation switches, and a fault‑current limiter. Provide a 30 min manual shutdown procedure.
Document all components in the Aircraft Electrical System Manual (AESM).
What is the recommended maintenance schedule for a 3‑phase vertiport?
Inspect breakers, transformers, and grounding monthly. Test SCADA alarms quarterly. Replace capacitors every 5 years.
Maintain a log of all inspections in the Vertiport Maintenance Management System (VMMS).
How do I calculate the kWh per kVA for the vertiport?
kWh per kVA = (kVA × hours) / (kVA × hours) = 1.0. For a 300 kVA system running 24 h, kWh = 7,200 kWh per day.
Use this to compare with renewable generation capacity.
What is the cost per kVA for a 300 kVA system?
At $0.12/kWh and 1 kWh per kVA per hour, cost per kVA = $0.12 × 24 h = $2.88 per kVA per day. Annual cost per kVA = $1,051.
Multiply by 300 kVA for total annual cost: $315,300.
How do I size the cable run for a 300 kVA vertiport?
Use 500 mm² copper for 100 kVA per phase over 200 m to keep voltage drop under 3 %.
Calculate ampacity: 500 mm² copper can carry 380 A at 75 °C.
What is the impact of a 10 % reserve on the system cost?
Adding 10 % reserve increases kVA from 300 kVA to 330 kVA. Cost rises from $1,800,000 to $1,980,000.
Reserve also improves reliability during peak demand.
How do I evaluate the return on investment for adding a battery buffer?
Assume a 200 kWh battery buffer. At $400 per kWh, cost = $80,000. Savings = 200 kWh × $0.12 = $24 per day, or $8,760 per year.
Payback = $80,000 / $8,760 ≈ 9 years.
What is the role of SCADA in a 3‑phase vertiport?
SCADA monitors voltage, current, power factor, and fault conditions in real time. It triggers alarms if any parameter exceeds thresholds.
Integrate with FAA’s Part 23.1395 for automated shutdown capability.
How do I calculate the transformer copper loss?
Copper loss = I² × R. For 100 kVA at 400 V, current = 250 A. With copper resistance 0.01 Ω, loss = 250² × 0.01 = 625 W per phase.
Three phases give 1,875 W total.
What is the typical lifespan of a 300 kVA transformer?
Transformers last 25–30 years with proper maintenance. Insulation can degrade after 20 years; plan for replacement.
Use a transformer with a 30 year warranty for critical infrastructure.
How do I ensure phase balancing in the vertiport?
Use a 3‑phase power monitor. Adjust load distribution to keep each phase within ±5 % of the others.
Install phase‑shift transformers if imbalance exceeds 10 %.
What is the required earthing conductor size?
For a 1 kA fault, use 50 mm² copper. This provides a resistance of ~0.02 Ω.
Check NEC Table 250.122 for sizing guidance.
How do I calculate the total power demand during peak load?
Peak load = 10 × 30 kVA = 300 kVA. Add 10 % reserve = 330 kVA. Convert to kW: 330 kVA × 0.95 = 313.5 kW.
Use this figure for transformer and breaker sizing.
What is the cost of installing a 3‑phase SCADA system?
Average cost is $200 per kVA. For 300 kVA, SCADA = $60,000.
Include network cabling and software licensing.
How do I calculate the total annual energy consumption?
Annual energy = 300 kVA × 24 h × 365 = 2,628,000 kWh.
At $0.12/kWh, annual cost = $315,360.
What is the impact of voltage regulation on eVTOL charging?
Voltage must stay within 10 % of nominal to avoid battery degradation. Use a voltage regulator rated 5 kVA per phase.
Regulator cost = $2,000 per phase.
How do I calculate the cost of a 500 kW solar array?
Solar cost = $1,500 per kW. For 500 kW, cost = $750,000.
Add inverter ($500 per kW) and mounting ($200 per kW): total $950,000.
What is the expected reduction in grid draw with solar?
Solar provides 500 kWh per day. Over 365 days, 182,500 kWh saved.
At $0.12/kWh, savings = $21,900 per year.
How do I size the battery buffer for 24‑hour autonomy?
Assume 1 kW per hour per eVTOL. For 10 eVTOLs, 10 kW load. 24 h requires 240 kWh. Add 20 % reserve = 288 kWh.
Use 48 V LiFePO4 cells, 6 kWh per module. Need 48 modules.
What is the cost per kWh of the battery buffer?
Battery cost = 48 modules × $1,200 = $57,600. Divide by 288 kWh = $200 per kWh.
Higher than grid but provides resilience.
How do I calculate the total cost of ownership for the vertiport?
Capital cost = $1,980,000 (transformer) + $60,000 (SCADA) + $950,000 (solar) = $2,990,000.
Annual operating cost = $315,360 – $21,900 (solar savings) = $293,460.
Payback = $2,990,000 / $293,460 ≈ 10.2 years.
How do I ensure compliance with FAA Part 23 for power systems?
Document all components in the Aircraft Electrical System Manual. Perform a 3‑phase load test at 110 % of rated load.
Submit the test report to the FAA for Part 23 approval.
What is the impact of a 10 % reserve on reliability?
Reserve allows for temporary overloads, such as a sudden surge from multiple eVTOLs charging simultaneously.
It reduces the likelihood of transformer overheating and extends lifespan.
How do I calculate the cost of a 3‑phase breaker?
Standard 350 A breaker costs $2,500. Three breakers = $7,500.
Include installation labor ($1,500).
What is the typical lifespan of SCADA components?
SCADA hardware lasts 10–12 years. Software licenses are annual.
Plan for replacement or upgrade after 10 years.
How do I calculate the total kWh per kVA for the vertiport?
kWh per kVA = (kVA × hours) / (kVA × hours) = 1.0. For 300 kVA over 24 h, 7,200 kWh per day.
Use this to benchmark renewable generation.
What is the impact of a 5 kVAR per phase power‑factor correction?
Improves apparent power utilization from 95 % to 100 %.
Reduces copper losses by ~5 %.
How do I calculate the cost of a 500 kW solar inverter?
Inverter cost = $500 per kW. For 500 kW, $250,000.
Include a 5 % contingency = $12,500.
What is the typical cost of a 3‑phase transformer in 2026?
Market price averages $6,000 per kVA for 400 V/400 V transformers.
For 300 kVA, cost = $1,800,000.
How do I calculate the total annual energy savings from solar?
Solar provides 182,500 kWh annually. At $0.12/kWh, savings = $21,900.
Subtract from operating cost to get net savings.
What is the cost of a 48 V battery module?
Average cost $1,200 per module. 48 modules = $57,600.
Divide by 288 kWh = $200 per kWh.
How do I calculate the voltage drop for a 100 kVA load over 50 m?
Use V_drop = I × R. Current = 250 A. R for 6 mm² copper over 50 m = 0.05 Ω. V_drop = 12.5 V (3.1 %).
Within acceptable limits.
What is the impact of a 10 % reserve on operating cost?
Reserve increases kVA to 330 kVA, raising daily cost from $36 to $39.60.
Annual increase = $1,140.
Loss = I² × R. For 250 A and 0.01 Ω, loss = 625 W per phase. Total 1,875 W.
Annual energy loss = 1,875 W × 8,760 h = 16,425 kWh.
Capital cost = $2,990,000. Annual operating cost = $293,460. Payback = 10.2 years.
Consider tax credits and incentives.
How do I ensure phase balancing during peak load?
Use a 3‑phase load monitor. Adjust chargers to keep each phase within ±5 %.
Install phase‑shift transformers if imbalance >10 %.
What is the impact of voltage regulation on eVTOL battery health?
Maintaining voltage within ±5 % reduces cycle count and extends battery life.
Use a voltage regulator rated 5 kVA per phase.
How do I calculate the cost of a 3‑phase SCADA system?
Cost = $200 per kVA. For 300 kVA, $60,000.
Include network cabling and software licensing.
What is the typical lifespan of a 3‑phase transformer?
25–30 years with proper maintenance.
Plan for replacement after 20 years.
kWh per kVA = 1.0 for a 24‑hour cycle.
Use to compare with renewable generation.
Loss = I² × R. For 250 A and 0.01 Ω, loss = 625 W per phase. Total 1,875 W.
Annual energy loss = 1,875 W × 8,760 h = 16,425 kWh.
Capital cost = $2,990,000. Annual operating cost = $293,460. Payback = 10.2 years.
Consider tax credits and incentives.
kWh per kVA = 1.0 for a 24‑hour cycle.
Use to compare with renewable generation.
Solar provides 182,500 kWh annually. At $0.12/kWh, savings = $21,900.
What happens if the eVTOL fleet size fluctuates below the design capacity?
When fewer than 10 aircraft are charged simultaneously, the instantaneous load drops proportionally. A 50‑vehicle vertiport still uses the same 300 kVA transformer, but the average hourly demand may fall to 150 kVA. This reduces daily energy consumption by 50 % and lowers operating costs accordingly.
Can I use a single‑phase supply for a small vertiport?
Single‑phase power is unsuitable for eVTOL charging because the chargers require 3‑phase to deliver balanced 400 V/400 V power. A single‑phase supply would force the use of a step‑down transformer and create significant voltage imbalance, leading to inefficient charging and increased losses.
How do I adjust the system for future eVTOL models with higher power draws?
Future models may demand up to 45 kVA per aircraft. Re‑calculate the peak load: 45 kVA × 10 = 450 kVA. Add a 10 % reserve to reach 495 kVA. Upgrade the transformer to 500 kVA, replace breakers to 400 A, and add additional phase‑shift capacitors to maintain power factor.
What are the implications of a 10 % voltage sag during peak load?
A 10 % sag reduces the effective voltage to 360 V, lowering the apparent power by 10 %. Chargers will throttle power output, extending charging times and potentially damaging battery cells if not properly regulated. Install voltage regulators rated 5 kVA per phase to clamp voltage within ±5 %.
How do I monitor and log phase imbalance events?
Integrate a 3‑phase power monitor that logs phase currents every minute. Set thresholds at ±5 % imbalance. When exceeded, the SCADA system logs the event, triggers an alarm, and automatically redistributes load if possible. Maintain a log file for FAA Part 23 compliance.
What contingency plans exist for transformer failure?
Install a redundant secondary transformer rated 150 kVA. During a primary failure, the secondary can supply up to 50 % of the load, allowing critical eVTOLs to finish charging. The SCADA system must switch feeds automatically and notify operators within 5 seconds.
How do I calculate the cost of adding a battery buffer for 48 h autonomy?
Assume 10 kW average load. 48 h requires 480 kWh. Add 20 % reserve = 576 kWh. At $400 per kWh, the buffer costs $230,400. This buffer offsets grid usage during peak demand periods and provides resilience during outages.
What is the impact of utility rate variability on operating costs?
Utility rates can swing from $0.08/kWh to $0.15/kWh depending on region and time of day. Use a time‑of‑use tariff to shift charging to off‑peak hours, reducing average cost to $0.10/kWh. This cuts annual operating costs by roughly $12,000 on a 300 kVA system.
How do I size the grounding conductor for a 1 kA fault current in a high‑rise vertiport?
For a 1 kA fault, use a 100 mm² copper conductor. This provides a resistance of ~0.01 Ω, meeting NEC Table 250.122. If the vertiport is in a seismic zone, add a ground rod array to maintain total resistance ≤5 Ω.
What are the regulatory requirements for SCADA data retention?
FAA Part 23 requires that SCADA logs be retained for a minimum of 5 years. Store logs in a secure, tamper‑evident database with daily backups. Provide auditors with access to the last 30 days of data upon request.
How do I calculate the total cost of ownership for a 500 kW solar array added to the vertiport?
Solar cost: $1,500/kW × 500 kW = $750,000. Inverter: $500/kW × 500 kW = $250,000. Mounting: $200/kW × 500 kW = $100,000. Total = $1,100,000. Annual savings: 182,500 kWh × $0.10/kWh = $18,250. Payback ≈ 60 years without incentives.
How do I evaluate the risk of transformer overheating during consecutive eVTOL charges?
Assume each eVTOL charges for 30 minutes at 3.3 kW per phase. With 10 vehicles, the transformer sees 330 kVA for 5 hours per day. Copper loss is 1.5 % of 300 kVA = 4.5 kW. Over 5 hours, 22.5 kWh of heat is generated. Ensure the transformer’s cooling system can dissipate this without exceeding 90 °C.
What is the effect of a 5 kVAR per phase capacitor bank on transformer losses?
Capacitors shift the power factor from 0.95 to 0.99, reducing reactive power by 5 %. This lowers current by 5 %, decreasing copper loss from 4.5 kW to 4.275 kW, saving 0.225 kW continuously.
How do I plan for future regulatory changes in eVTOL ground power?
Track FAA updates via the FAA’s Aviation Certification portal. Maintain modular design: use a modular transformer that can be replaced without rewiring the entire system. Keep spare capacitors and breakers on hand to comply with new power‑factor or safety margin requirements.
What is the cost of installing a 3‑phase SCADA system with redundant data paths?
Base SCADA cost: $200/kVA × 300 kVA = $60,000. Add $20,000 for redundant fiber links and backup power supplies. Total = $80,000. This ensures 100 % uptime during critical operations.
How do I calculate the energy savings from a 200 kWh battery buffer during peak demand?
Peak demand at 10 kW for 2 hours = 20 kWh. A 200 kWh buffer can cover this entirely, eliminating 20 kWh of grid draw. At $0.12/kWh, savings = $2.40 per peak event. Over 200 peak events per year, annual savings = $480.
What is the impact of a 10 % reserve on transformer lifetime?
A 10 % reserve keeps transformer load at 90 % of rated capacity. This reduces thermal cycling and extends lifespan from 25 years to ~30 years, saving maintenance costs of $5,000 annually.
How do I determine the optimal cable size for a 300 kVA vertiport over 150 m?
Use 500 mm² copper for 100 kVA per phase over 150 m to keep voltage drop <3 %. Current = 250 A; ampacity of 500 mm² copper at 75 °C is 380 A, providing a 20 % safety margin.
What is the cost of a 48 V battery module used in a 300 kVA vertiport?
Average cost $1,200 per module. For a 288 kWh buffer, 48 modules are needed, totaling $57,600. This is equivalent to $200 per kWh.
How do I calculate the total annual energy consumption for a 500 kW solar array?
Annual production = 500 kW × 5 h/day × 365 = 912,500 kWh. At $0.10/kWh, revenue = $91,250. This offsets a portion of the 300 kVA system’s grid draw.
What are the failure modes of the 3‑phase breaker during a fault?
In a 1 kA fault, the breaker must trip within 0.1 s. Failure to trip can lead to transformer damage and fire risk. Use breakers with a 5 kA short‑circuit rating and test them annually under simulated fault conditions.
How do I calculate the cost of adding a 200 kWh battery buffer for 24‑hour autonomy?
At $400/kWh, cost = $80,000. Add 10 % contingency = $88,000. This buffer covers 20 kW average load for 24 h, providing resilience during grid outages.
What is the impact of a 5 kVAR per phase capacitor on voltage regulation?
Capacitors reduce reactive power, lowering voltage sag by 2–3 %. This keeps voltage within ±5 % during peak loads, protecting battery health and reducing inverter stress.
How do I calculate the total annual energy savings from a 500 kW solar array?
Solar produces 912,500 kWh annually. At $0.10/kWh, savings = $91,250. Subtract from the 300 kVA system’s annual cost to get net savings.
What is the cost of installing a 3‑phase transformer with a 10 % surge rating?
Standard 300 kVA transformer: $1,800,000. Add 10 % surge rating: $180,000. Total = $1,980,000.
kWh per kVA = 1.0 for a 24‑hour cycle. Use this to benchmark renewable generation.
Solar provides 182,500 kWh annually. At $0.12/kWh, savings = $21,900.
Loss = I² × R. For 250 A and 0.01 Ω, loss = 625 W per phase. Total 1,875 W.
Battery cost $57,600 for 288 kWh = $200 per kWh.
Cost = $200 per kVA. For 300 kVA, $60,000.
kWh per kVA = 1.0 for a 24‑hour cycle.
Solar provides 182,500 kWh annually. At $0.12/kWh, savings = $21,900.
Loss = I² × R. For 250 A and 0.01 Ω, loss = 625 W per phase. Total 1,875 W.
Battery cost $57,600 for 288 kWh = $200 per kWh.
Related guides: Life‑Cycle Emissions of a Lithium‑Iron‑Phosphate vs NMC Aircraft Battery · eVTOL Economics: The Cost per Seat-Mile That Has to Be Beaten · eVTOL Certification Tracker: Who Is Actually Certified in 2026 · Contrail Avoidance Explained: The Best 2026 Guide to Cooling Aviation · Hybrid‑Electric Cargo Plane: Power‑to‑Weight Breakdown · Aviation Battery Safety: Why Aircraft Cells Are Certified Differently · Hydrogen Airports: What Liquid Hydrogen Refuelling Would Take · Zero-Carbon Aviation: What Actually Works, and What Is Certified · Sustainable Aviation Fuel: How Much Exists, and What It Costs.
What is the peak power demand per eVTOL during a 10‑minute charging cycle?
Peak demand occurs when the aircraft draws its maximum power for rapid battery replenishment. The following table shows typical values for three common eVTOL power classes.
| Power Class | Peak Power (kW) | Charging Time (min) |
|---|---|---|
| Low‑Power (≤200 kW) | 180 | 10 |
| Mid‑Power (200–400 kW) | 360 | 10 |
| High‑Power (400–600 kW) | 540 | 10 |
How much copper is needed per phase for a 300 kVA transformer at 400 V?
Transformer winding copper is a major cost driver. The table below estimates copper weight per phase based on standard ampacity tables.
| Phase | Current (A) | Copper Weight (kg) |
|---|---|---|
| Phase A | 425 | 45 |
| Phase B | 425 | 45 |
| Phase C | 425 | 45 |
What is the projected annual energy consumption for a vertiport that charges 10 eVTOLs per hour?
Assuming each eVTOL consumes 50 kWh per charge and the vertiport operates 12 h/day, the table shows yearly totals.
| Daily Charge Hours | kWh/Day | kWh/Year |
|---|---|---|
| 12 | 6 000 | 2 190 000 |
What is the cost impact of adding a 10 % reserve margin to the transformer rating?
Adding reserve increases transformer cost and copper weight. The table below compares 300 kVA and 330 kVA ratings.
| Transformer Rating | Cost ($) | Copper Weight (kg) |
|---|---|---|
| 300 kVA | 120 000 | 135 |
| 330 kVA | 132 000 | 148 |
The following bar chart shows the projected annual operating cost for three utility rates.
Frequently Asked Questions
How do I estimate the cost of a 3‑phase breaker for a 300 kVA system?
A typical 3‑phase breaker for 300 kVA at 400 V costs around $1,200–$1,500, depending on manufacturer and current rating. The breaker must handle 425 A per phase with a 1.5× safety margin.
What is the impact of a 5 kVAR per phase capacitor bank on transformer losses?
Adding 5 kVAR per phase reduces reactive power by 15 %, lowering copper losses by ~3 % and improving voltage regulation during peak load.
How do I calculate the total annual energy consumption for a 500 kW solar array added to the vertiport?
Assuming 4 h of peak sun per day, the array produces 2 000 kWh/day, or 730 000 kWh/year. Adjust for local irradiance and system losses (~20 %).
How do I estimate the capital cost of installing a 3‑phase transformer at a vertiport?
The transformer price is roughly $1.5–$2.5 per kVA for a 400 V, 3‑phase unit in 2026. For a 300 kVA transformer, that translates to $450 k–$750 k, plus a 10 % contingency for shipping and installation. Adjust the figure if your utility rate or local labor costs differ.
What is the typical cost of a 3‑phase SCADA system with redundant data paths?
Commercial SCADA packages run $50–$80 per kVA of monitored load. For a 300 kVA vertiport, expect $15 k–$24 k, plus $5–$10 k for networking and redundancy hardware.
How do I calculate the annual energy savings from a 200 kWh battery buffer during peak demand?
Assume a 200 kWh buffer discharges at 50 kW during a 4‑hour peak window each day. That’s 800 kWh saved per day, or 292 kWh per month. Multiply by the local rate (e.g., $0.10/kWh) to get ~$29 k per month in avoided grid costs.
What is the most cost‑effective way to calculate the capital cost of a 3‑phase transformer for a vertiport?
Use the 2026 industry benchmark of $1,800 per kVA for a 300 kVA unit, then adjust for local procurement fees and installation labor (≈$0.10 per kVA). This gives a baseline of $540 k for the transformer plus $30 k for cabling and mounting, totaling roughly $570 k before tax incentives.
Which utility rate structure should I use when estimating the operating cost of a vertiport?
Apply the commercial time‑of‑use schedule from the local utility (e.g., $0.12 /kWh peak, $0.08 /kWh off‑peak). Multiply the hourly demand by the corresponding rate and sum over the day to get an annual cost. Adjust the rate input in the calculator to reflect any future rate changes.
How can a vertiport integrate a renewable energy source without violating FAA Part 23?
Install a dedicated PV array with a DC‑to‑AC inverter rated for the peak eVTOL charge load (≈500 kW). The inverter must be listed for aircraft ground power use, and the system must include a disconnect and isolation interlock per FAA guidance. Document the design in the aircraft’s electrical system data sheet.
What is the cost per kWh of adding a 200 kWh battery buffer to support peak demand?
Assuming a 400 V, 400 Ah Li‑ion pack at $350 per kWh, the buffer costs $70 k. Adding balance‑of‑system (BOS) components (inverters, controls, enclosure) adds ≈$15 k, for a total of $85 k or $0.425 per kWh of storage.
What regulatory requirements govern SCADA data retention for vertiport power systems?
FAA Part 23 requires that all power‑system logs be retained for at least 12 months, with a minimum of 30 days of real‑time data archived. The SCADA platform must support secure, tamper‑evident storage and provide audit trails compliant with ICAO Annex 13 data standards.
How should the system be sized to accommodate future eVTOL models with higher power draws?
Include a 20 % design margin in the transformer rating and cable sizing. Use a modular power‑distribution cabinet that allows adding a 50 kVA secondary feed without major rewiring. This approach keeps the initial capital cost lower while ensuring scalability for next‑generation aircraft.
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