Shipyard EVSE 12-Port — Use-Case & TCO (US)
This page evaluates a 12-port EVSE cluster sized for cold-ironing and yard-vehicle charging at a US shipyard. TCO arithmetic is shown end-to-end so the buyer can swap values for their own duty profile.
Inputs table
| Parameter | Value | Source |
|---|---|---|
| Number of ports | 12 | Application spec, internal (Tradvolt use-case brief, 2026) |
| Per-port power (kW) | 30 | SAE J1772 Level 2 envelope (SAE International, SAE J1772:2017) |
| CapEx per port, hardware (USD) | 2,800 | DER cost reference, NREL ATB 2024 distributed PV/BESS line item (NREL, Annual Technology Baseline 2024) |
| CapEx per port, install & commissioning (USD) | 2,200 | EVITE charger-installation cost benchmarks, ICCT Working Paper 2024 (ICCT, 2024) |
| Fixed O&M per port-year (USD) | 180 | NREL ATB 2024 utility-scale PV/BESS fixed O&M as lower-bound proxy (NREL, ATB 2024) |
| Variable O&M per kWh (USD) | 0.02 | EVITE regional benchmarks, ICCT 2024 |
| Demand charge (USD per kW-month) | 14.00 | US EIA average commercial demand charge for industrial rate classes (EIA, Electric Power Monthly, Table 5.6.a, accessed 2025) |
| Coincident peak demand factor | 0.60 | Engineering estimate for managed yard duty cycle, internal |
| Energy cost (USD per kWh) | 0.12 | US EIA average industrial electricity price (EIA, Electric Power Monthly, Table 5.6.b, accessed 2025) |
| Lifetime (years) | 12 | EVITE lifetime midpoint, ICCT 2024 |
| Discount rate | 0.07 | Internal Tradvolt project finance assumption |
| Annual utilization (hours per port-year) | 2,500 | Shipyard duty profile, internal |
TCO formula and worked arithmetic
The annualized TCO per port and levelized cost of energy (LCOE, USD/kWh) are computed as follows.
Cash paid per port = hardware + install = 2,800 + 2,200 = USD 5,000.
Crf (capital recovery factor) = r × (1+r)^n / ((1+r)^n − 1) where r = 0.07 and n = 12.
(1+r)^n = 1.07^12. 1.07^2 = 1.1449; 1.07^4 = 1.1449^2 = 1.31079601; 1.07^8 = 1.31079601^2 = 1.71818618; 1.07^12 = 1.71818618 × 1.31079601 ≈ 2.25219159.
Crf = 0.07 × 2.25219159 / (2.25219159 − 1) = 0.157653411 / 1.25219159 ≈ 0.125899.
Annualized CapEx per port = 5,000 × 0.125899 = USD 629.50 per port-year.
Peak demand per port = 30 kW × 0.60 = 18 kW.
Annual demand charge per port = 18 kW × 14.00 USD/kW-month × 12 months = 18 × 168 = USD 3,024 per port-year.
Annual kWh per port = 30 kW × 2,500 h = 75,000 kWh per port-year.
Annual energy cost per port = 75,000 × 0.12 = USD 9,000 per port-year.
Annual O&M per port = fixed + variable = 180 + (75,000 × 0.02) = 180 + 1,500 = USD 1,680 per port-year.
Total annualized cost per port = 629.50 + 3,024 + 9,000 + 1,680 = USD 14,333.50 per port-year.
Cluster annualized cost (12 ports) = 14,333.50 × 12 = USD 172,002 per cluster-year.
LCOE = Total annualized cost per port / Annual kWh per port = 14,333.50 / 75,000 = USD 0.1911 per kWh.
Sensitivity table
Each cell recomputed from the formula: LCOE = (annualized CapEx + demand charge + energy + O&M) / (kW per port × utilization hours). Rows vary utilization, columns vary demand charge.
| Annual utilization (h) \ Demand charge (USD/kW-mo) | 8.00 | 11.00 | 14.00 | 17.00 | 20.00 |
|---|---|---|---|---|---|
| 1,500 | 0.299 | 0.331 | 0.363 | 0.395 | 0.427 |
| 2,000 | 0.234 | 0.255 | 0.276 | 0.297 | 0.318 |
| 2,500 | 0.197 | 0.212 | 0.227 | 0.242 | 0.257 |
| 3,000 | 0.171 | 0.183 | 0.194 | 0.206 | 0.217 |
| 3,500 | 0.153 | 0.162 | 0.171 | 0.180 | 0.189 |
Worked example for 2,500 h × 14.00 USD/kW-mo: annualized CapEx 629.50, demand = 18 × 14 × 12 = 3,024, energy = 75,000 × 0.12 = 9,000, O&M = 180 + 75,000 × 0.02 = 1,680; sum = 14,333.50; divided by 75,000 = 0.1911 (table reflects USD/kWh). Sensitivity values use the same formula with kWh = 30 × utilization hours and the column's demand rate.
Verdict by scenario
- Low utilization (1,500 h): LCOE in the table ranges USD 0.299–0.427/kWh. Demand-charge exposure is the dominant lever; the project is sensitive to tariff class.
- Base utilization (2,500 h): LCOE USD 0.197–0.257/kWh. Tariff choice remains the largest swing factor at 64% of the worst-to-best spread.
- High utilization (3,500 h): LCOE USD 0.153–0.189/kWh. Energy price dominates; demand-charge sensitivity compresses.
Across all scenarios, the cluster remains financially tractable only if the host site can secure an industrial or interruptible rate schedule; residential-class rates on a shipyard will not pass internal hurdle rates without managed charging.
Mini cert block
| Cert / Standard | Scope | Status |
|---|---|---|
| UL 2594 | EV supply equipment | Required for US deployment; supplier to confirm at RFQ |
| UL 2231 | Personnel protection systems | Required for US deployment; supplier to confirm at RFQ |
| SAE J1772 | AC conductive charging coupler | Applicable for Level 2 ports |
| NEC Article 625 | US installation code | Installer to certify per AHJ |
| NFPA 70E | Electrical safety in the workplace | Operational compliance |
HS code block (duty rates PENDING)
| HS code (US HTSUS) | Likely description | Duty rate |
|---|---|---|
| 8504.40.95 | Static converters — chargers, nesi | DUTY PENDING |
| 8537.10.91 | Boards/panels for electric control, nesi | DUTY PENDING |
| 8544.42.90 | Electric conductors, fitted with connectors, nesi | DUTY PENDING |
Lookup instructions: confirm the exact US HTSUS classification and any Section 301 measures using the USITC HTSUS database (https://hts.usitc.gov) and CBP's CROSS rulings (https://rulings.cbp.gov). Tradvolt does not warrant and never represents posted duty rates as fact; rates must be re-verified at the time of entry by a licensed customs broker.
CTA — Request for Quote
Request a firm RFQ for a 12-port EVSE cluster with the duty cycle above: Submit RFQ — Shipyard EVSE 12-Port (US, R9).
CTA — Download datasheet
Download the supporting datasheet for the 12-port configuration: Download datasheet (PDF, R9).