Power infrastructure requirements, three reference station configurations, safety and compliance, a six-step deployment process of about 6 – 7 weeks, and operation and maintenance of Scharge charging stations through a single point of contact.
10 · Power infrastructure
The station's installed capacity determines the power supply solution. The figures below are for preliminary surveys; the construction design is calculated by the consultant based on the existing grid, installation conditions and current regulations.
common earthing · tested at acceptance
Reference diagram. Each charger has a dedicated feeder with a CB and a Type B residual current device (RCD).
| Charger type | Supply | Input power | Input current | CB |
|---|---|---|---|---|
| AC 7 kW | 1-phase 220 V | 7.0 kVA | 32 A | 40 A |
| SC14 | 1-phase 220 V | 14.1 kVA | 64 A | 80 A |
| DC 40 kW | 3-phase 380 V | 43.0 kVA | 65 A | 80 A |
| SC80 | 3-phase 380 V | 86.0 kVA | 131 A | 160 A |
| SC160 | 3-phase 380 V | 171.9 kVA | 261 A | 320 A |
| DC 240 kW | 3-phase 380 V | 257.9 kVA | 392 A | 500 A |
| DC 320 kW | 3-phase 380 V | 343.9 kVA | 523 A | 630 A |
DC chargers calculated at 94% efficiency and power factor 0.99; AC chargers at rated current. CB selected by operating current; derate for temperature, cable installation method and design standards.
Station with 2 × SC160 + 4 × SC14: total apparent power ≈ 2 × 171.9 + 4 × 14.1 ≈ 400 kVA. Select a 560 kVA transformer — loaded at about 71% when all chargers run at full power; AC chargers are distributed evenly across the three phases.
| Size | Example configuration | Apparent power | Reference supply solution |
|---|---|---|---|
| Small | 2 – 4 × SC14 | ≈ 28 – 56 kVA | Existing LV supply if spare capacity is available; dedicated sub-distribution board |
| Medium | 1 – 2 × SC80 + 2 × SC14 | ≈ 115 – 200 kVA | Dedicated LV board; check spare capacity of the existing transformer |
| Large | 2 – 4 × SC160 | ≈ 345 – 690 kVA | Dedicated transformer substation of about 560 – 1 000 kVA |
| Large-scale fast-charging station | Multiple DC cabinets 240 – 400 kW | above 1 MVA | Dedicated medium-voltage substation, grid connection agreement with the power utility |
11 · Reference station configurations
Typical configurations for quickly estimating installed capacity, transformer size and area before the site survey. Figures assume all chargers run at full power simultaneously.
10 × SC14
Dual-connector AC chargers placed between two parking bays; uses the building's existing LV supply.
4 × SC80 + 4 × SC14
DC for fast charging between shifts, AC for long-dwell vehicles; one shared distribution board next to the transformer.
4 × SC160 + 2 × SC14
DC cabinets under a canopy, supplementary AC for long-stay vehicles; dedicated transformer substation next to the charging area.
S = Σ SunitTake the input power of each charger type from the supply requirements table (SC14 ≈ 14.1 kVA; SC80 ≈ 86.0 kVA; SC160 ≈ 171.9 kVA).Scalc = S × ksimk = 1 when all chargers run at full power; less than 1 when designing from actual operating data.STX ≥ Scalc ÷ 0.8Choose the nearest standard rating above: 250 · 400 · 560 · 750 · 1 000 kVA; loading not exceeding 80%.Simultaneity factor not applied; 2.5 × 5.0 m parking bays, excluding driveways and technical areas. The transformer rating may be reduced using the simultaneity factor in detailed design; spare cables, plinths and outgoing feeders should be provided for future expansion. Layout diagrams are illustrative, not to scale.
12 · Safety and compliance
Charging station safety is ensured at two levels: protection built into the charger and protection in the power supply system. The cross-reference table shows the current compliance status against national standards and the draft national technical regulation on EV chargers and charging stations.
Trips when grid voltage exceeds the permitted threshold
Stops charging when grid voltage falls below the threshold
Detects leakage current and cuts the charging circuit
Protection against lightning-induced surge overvoltage
Monitors equipment temperature, protects when thresholds are exceeded
Trips when current exceeds the rating
Stops on the vehicle's signal and the session limit
AC chargers cut off automatically when the battery is full
DC chargers have the first seven protection functions; full-charge cutoff applies to AC chargers. The DC 40 kW charger also has an emergency stop button.
| Requirement | Basis | Scharge solution | Status |
|---|---|---|---|
| Minimum IP54 enclosure for outdoor installation | Draft QCVN | All charger lines rated IP54 per manufacturer specifications | Compliant |
| Type B RCD on each charger supply circuit | Draft QCVN · IEC 62423 | Installed at the distribution board, one device per charger feeder | Implemented during construction |
| Power factor ≥ 0.9 at the point of delivery, under all load conditions | Draft QCVN | DC 40 kW: ≥ 0.99 (manufacturer); other lines to be confirmed during testing | Pending testing |
| SPD Type 1 and Type 2 surge protection | Draft QCVN | Installed at the main board and distribution boards | Implemented during construction |
| Smart electronic energy meter at the point of delivery | Draft QCVN | Installed at the main board; chargers have built-in metering (AC class 2, DC class 1) | Implemented during construction |
| General requirements for conductive charging systems for electric vehicles | TCVN 13078-1:2020 (IEC 61851-1:2017) | Specification cross-check, test documentation prepared | Pending testing |
| Particular requirements for DC charging stations | TCVN 13078-23:2020 (IEC 61851-23:2014) | Applies to SC80 · SC160 and the extended DC lines | Pending testing |
| CE certification; ISO 9001, 14001, 45001 management systems | Manufacturer's declaration | Per manufacturer documentation | Compliant |
Draft National Technical Regulation on EV chargers and charging stations, published by the Ministry of Industry and Trade for public comment on 07/8/2026, implementing Notice 307/TB-VPCP dated 16/6/2026; the draft proposes entry into force from 01/7/2027. The Scharge compliance dossier will be updated to the official regulation once issued.
13 · Deployment
Six steps from survey to operation, through a single point of contact. Equipment is supplied within about 03 weeks of order; infrastructure works run in parallel to shorten the overall timeline.
Indicative timeline of about 6 – 7 weeks for stations not requiring a transformer substation upgrade; grid connection and capacity upgrade procedures with the power utility (if any) are counted separately. The official schedule is as per contract.
The investor buys Scharge chargers for installation on its own site. SPT supplies, installs, activates the platform and provides the warranty; the investor manages the station and the charging revenue.
Suited to: Site owners, gas stations, apartment buildings, businesses
The partner contributes the site and power supply. CD Restop invests in Scharge chargers supplied by SPT, builds and operates the station; revenue is shared as agreed.
Suited to: Site owners, car parks, rest stops
Design, installation and operation of dedicated stations for the EV fleets of transport, delivery and taxi companies; turnkey under a service contract.
Suited to: Businesses transitioning their fleets to EVs
14 · Operation and maintenance
Scharge stations are monitored continuously via the platform; incidents are received by the SST Operations Center through Hotline 1900 7116 and handled under three support levels. A preventive maintenance schedule maintains charger safety and availability.
Receives requests and guides users; remote restart, configuration and software updates.
On-site inspection; replacement of connectors, cables, boards and modules; safety testing after repair.
Analysis of complex faults, firmware, supply of components under warranty.
| Frequency | Preventive maintenance tasks | AC | DC |
|---|---|---|---|
| Weekly | Visual inspection of enclosure, display and indicator lights; connectors and charging cables (cracks, crushing, dirty contacts) | Applicable | Applicable |
| Monthly | Clean surfaces and ventilation slots; press the RCD test button; check 4G/Ethernet connectivity and data sync | Applicable | Applicable |
| Quarterly | Clean or replace air filters, check cooling fans; retighten cable lugs; check connector temperatures with a thermal camera | Not applicable | Applicable |
| Every 6 months | Inspect surge protection devices (SPD), switching and protection devices at the distribution board | Applicable | Applicable |
| Annually | Measure earth resistance and insulation resistance; check metering; update firmware per manufacturer recommendations | Applicable | Applicable |
Warranty and spare parts. The warranty period, scope and service level commitments are as per the contract and warranty card. Recommended spares at the regional warehouse: charging connectors, cables, control boards and power modules for DC stations.
Source: Technical dossier of the Scharge EV charging station solution, SPT · SST Center, version 09/2026.
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