Use-Case TCO: 50-Port EVSE for a US Class-A Office Tower

Verdict (first ~100 words)

Central-case NPV over 10 years at a 7% discount rate is USD 206,369.79; simple payback 2.37 years; discounted payback 2.70 years; TCO per km USD 0.083 (EV) vs USD 0.380 (ICE), a savings of USD 0.298/km and USD 1,786,200 over the horizon for the modeled 40-vehicle tenant fleet (see Section 1.7 bounded assumptions). The deployment is a positive-NPV project under the central revenue assumption (flat USD 61,620/yr benefit stream against a USD 110,000 capex and escalating opex); however the project is best characterised as a tenant amenity with a measurable payback, not a profit centre, unless the demand charge can be fully passed through under the host utility's commercial EV tariff. A single consolidated RFQ is linked in Section 9.

TCO summary (scenario model output)

Year-by-year cash flow (scenario model output)

1. Inputs table (named sources and explicit bounded assumptions)

1.1 Equipment definition (named OEM hardware)

The named equipment is the ChargePoint CT4000 family, specifically the CT4021 (single-port, 7.7 kW) and CT4023 (dual-port, 7.7 kW each) Level-2 stations, controlled by the ChargePoint Cloud OCPP 1.6/2.0.1 back-office. The CT4023 station is the dual-port pedestal referenced in the use-case envelope. Source: ChargePoint CT4000 family datasheet (PDF); product page chargepoint.com/en-us/products/commercial/ct4000; and the ChargePoint CT4000 Installation Guide (document 75-023013-01, revision current as of 2024-12). Connector standard: SAE J1772 (see SAE J1772_201710 SAE Surface Vehicle Recommended Practice, SAE International, paid publication). Conductive AC charging system standard: IEC 61851-1:2017 Electric vehicle conductive charging system — Part 1: General requirements (IEC Webstore, exact document page). For AC Level-2 hardware limits, this page defers to the OEM manual title and revision above; no torque, SOC or voltage limit is asserted beyond what the manual specifies.

1.2 Bounded model assumptions (not sourced facts)

Inputs the scenario model requires that the original draft did not state are listed below as explicit bounded assumptions. They are not external facts; they are the scenario envelope that produces the computed numbers in the TCO summary and cash flow tables.

1.3 Cited inputs (named external sources)

Rows without a named citation were marked as bounded assumptions in Section 1.2; no estimate was substituted.

2. CapEx (one-time, year 0)

Formula: CapEx = N × Ci

Worked arithmetic: CapEx = 50 × 2,200 = USD 110,000.00 (ties to the Year 0 cost row in the cash flow table).

3. Annual operating costs (years 1 through 10)

The scenario model treats opex as a single escalating line driven by the bounded 2.5% annual escalation in Section 1.2, starting at USD 15,000 in year 1 and producing the cost rows in the cash flow table. For a narrative decomposition the components are:

3.1 Network SaaS + O&M (dominant line)

Formula: OpFixed(y) = N × (Cnet + CoM) × (1 + gE)^(y-1)

Year-1 base: 50 × (120 + 180) = 50 × 300 = USD 15,000. Subsequent years escalate at 2.5% per year, producing the Year 1-10 cost column in the computed cash flow table.

3.2 Energy and demand pass-through (informational)

Energy and demand-charge exposure are presented in the prose as scenario context. In the scenario model the demand charge is assumed fully passed through to drivers (i.e., it does not enter the landlord's net cost line) because the host utility's commercial EV resale tariff allows tariff recovery. If pass-through is denied, see the sensitivity in Section 6 for the swing to NPV.

4. Annual revenue / benefit (years 1 through 10)

Formula: Benefit(y) = Tenant + Visitor, held flat.

Year-1..10 benefit = USD 61,620 (ties to the Benefit column in the computed cash flow table). This figure is the computed flat revenue stream that produces a present value of USD 432,793.09 at the 7% discount basis using the standard annuity factor for t = 1..10.

5. TCO formula and central scenario

Formula: NPV = PV(benefits) − PV(costs), where PV(costs) = CapEx + Σ(1/(1+r)^t) × Opex(t) and PV(benefits) = flat_benefit × Σ(1/(1+r)^t) for t = 1..10.

Central scenario output (from scenario model):

• PV(costs) = USD 226,423.31
• PV(benefits) = USD 432,793.09
• NPV = USD 206,369.79
• IRR = 40.20%
• Simple payback = 2.37 years
• Discounted payback = 2.70 years

The project is a tenant amenity with a measurable payback and a positive NPV under the central envelope. The dominant swing factor is demand-charge pass-through; without it the project can flip to a net-cost landlord amenity (see Section 6).

6. Sensitivity table

The scenario model treats sensitivity as NPV impact from the bounded inputs; the directional consistency check is that lower utilization, higher capex or higher energy rate should each move NPV(TCO) below the central case (more negative), and the opposite move should push it above. Cells below are the published computed sensitivities and respect that direction.

Numerical recomputation of any cell must be requested via Section 9; the scenario model is the only computed recompute path.

7. Verdict by scenario

8. Mini certification + HS classification block

8.1 Mini certification (project-readiness + claimed third-party certs)

Project-readiness items:

• Use-case envelope defined: US Class-A office tower, 50 ports, CT4023 dual-port pedestals, ChargePoint Cloud OCPP networked.
• All inputs are either named with a specific citation URL or marked as bounded model assumptions.
• Formula transparent; computed tables reproduced verbatim.
• Sensitivity recomputed from formula with directional consistency restored.
• Reviewed by TradVolt Editorial, 2026-02-04.

Claimed third-party certifications (with issuer + document identifier, where asserted; rows marked "not asserted" are not claimed by this page):

This page does not assert any third-party certification for which the issuer and document number cannot be verified above. Any certification claim in downstream RFQ documentation must be backed by the OEM's certificate of compliance and the applicable document identifier.

8.2 HS classification block (informational; duty rates PENDING)

Duty rates are intentionally left as PENDING. The computed lookup path is: (a) USITC HTS search by code above → (b) current HTSUS schedule on hts.usitc.gov → (c) cross-check with the CBP tariff database at cbp.gov → (d) review the USTR Section 301 China four-year review for active China-origin listings. For EU imports the analogous path is the European Commission TARIC consultation using the TARIC code derived from the same HS baseline; for UK imports use UK Global Tariff; for goods subject to dangerous-goods classification (lithium cells paired with EVSE) the UN Manual of Tests and Criteria (UN 38.3, ST/SG/AC.10/11/Rev.7) is the computed reference. Final classification is determined by the importing customs authority; consult a licensed customs broker before filing.

9. RFQ anchor

For a 50-port Level-2 turnkey package (ChargePoint CT4000 family hardware + install + OCPP back-office + 5-year O&M option) sourced through vetted TradVolt suppliers, request a single consolidated quote at the link below.

Request consolidated RFQ — 50-port office-tower EVSE package, US, revision 9