How EVhubs engineers an integrated PV + BESS + EVCS site.
Solar PV, battery energy storage, ultra-fast EV charging and intelligent energy management — engineered as one orchestrated system. Below: the reference architecture, regulatory compliance posture, subsystem design, and the global deployment footprint of the equipment stack we integrate.
Anonymised Singapore deployment — system scale.
Indicative project requirements for a Singapore commercial-transport electrification site EVhubs has scoped — published anonymised on customer request. Demonstrates the order of magnitude and integration scope of a single-site deployment.
DC Sources (PV)
0.5 MW
Rooftop solar generation.
Battery Storage
2 MWh
Containerised LFP BESS.
DC Fast Charging
20 × CCS2
360 kW liquid-cooled per connector.
AC Charging
40 × 22 kW
For overnight / depot-cycle vehicles.
Integration scope: PCS · APF · SVG · EMS · PDU · STS · system commissioning. Delivered as a containerised solution, fully pre-integrated for site-side handover.
DC coupling — PV, BESS and EVCS on a single 800V DC busbar.
Solar PV converges directly with battery storage on an 800V DC busbar via MPPT — bypassing the AC/DC conversion losses of an AC-coupled architecture. The PCS handles bidirectional power flow to the grid; the EVCS draws from the bus through 360 kW DC fast chargers and 22 kW AC chargers.
High efficiency
PV charges the battery via MPPT directly — 2–3% higher overall efficiency vs an AC-coupled system. Fewer conversion stages, less heat, less loss.
Peak shaving
Charge the battery off-peak, discharge during peak windows to cut demand charges. Tariff arbitrage is handled by the EMS, not by an operator at the controls.
Black-start capability
In islanded mode, solar maintains DC bus voltage for reliable off-grid startup — without grid support. Critical for resilience in industrial sites.
Priority logic
PV first → BESS buffer → grid top-up only when needed. Surplus PV exported back to SP Group under standard tariff arrangements.
Built to Singapore + international compliance, not retro-fitted to it.
An integrated PV + BESS + EVCS site touches fire safety, grid connection, structural electrical, solar, EV charging and outdoor environmental standards simultaneously. EVhubs's design posture is to comply by architecture, not by exception.
Fire safety
- · SS 667: 2020 — 4.8 m row / 1.0 m cabinet spacing + FK-5-1-12 suppression for BESS.
- · Fire Code 2023 (10.3) — QP submission + Hazard Mitigation Analysis for stationary storage.
- · UL 9540A — large-scale fire test report required for cell / module / unit / installation level.
Grid connection
- · SP Group TS 10.1 — anti-islanding, OV/UV, OF/UF, zero-sequence relays.
- · Transmission Code — THD, voltage dip, power factor at Point of Common Coupling.
Electrical & structural
- · SS 638: 2018 — PE certification for 3600 A cabling, TT / TN-S earthing.
- · IEC 60076-11 — 1600 kVA dry-type cast-resin transformer (IP23/54).
- · SS 555: 2018 — Lightning Protection System + Type I+II SPDs.
Solar & EV charging
- · SS 601: 2014 — 480 kW PV DC-side isolation and labelling.
- · TR 25:2022 & TR 25-3:2022 — high-power EV charging (Singapore).
- · OCPP 2.0.1 — Open Charge Point Protocol compliance for the charger fleet.
Environmental
- · ISO 12944 (C5-M) — marine-grade anti-corrosion for all outdoor enclosures. Singapore's coastal humidity makes this non-optional.
PCS / MPPT / STS — hybrid energy integration.
Modular "Lego-style" cabinets — standardised PCS, MPPT and STS modules combine flexibly to match site scale and duty cycle.
AC Output (8 × 125 kW PCS)
PV Input (8 × 60 kW MPPT)
MPPT Efficiency
Grid / Off-Grid Switching
Enclosure Rating
PCS supports V/F stabilisation in islanded mode
Supports commercial & industrial peak shaving, valley filling, dynamic capacity expansion and UPS use cases. STS ensures switchover in <10 ms on grid faults — within the limits required to keep critical site loads online.
EVCL-360kW-2G — Liquid cooling.
EVhubs has a direct manufacturer partnership for the high-power DC fast charger we deploy — the partner operates its own R&D and factory in Shenzhen, with internal engineering capacity sitting alongside our team. That partnership lets us specify, validate and field-support the hardware end-to-end rather than rely on a distributor.
Dispenser at a glance
- · Output: 360 kW per single gun, liquid-cooled cable rated 500–600 A.
- · Connector: CCS2, 360 A / 1000 V, 7.9 m liquid-cooled cable.
- · Architecture: 1 power cabinet → 5 dispensers → 10 connectors, dynamic SOC-based dispatch.
- · Cooling: full liquid cooling — cables 50% lighter than air-cooled equivalents, driver-handleable.
- · Certified: TR 25:2022 + TR 25-3 (Singapore) · OCPP 2.0.1 via OCA · IP55 enclosure.
- · Operating range: −30°C to +50°C, noise <65 dB — urban-edge industrial sites.
- · Design life: 10–15 years, dust and salt-spray protected for SG conditions.
360 kW single-gun output
Liquid-cooled cables rated for 500–600 A. EV trucks gain ~400 km range in 10 minutes. Cables are 50% lighter than air-cooled equivalents — usable by drivers without operator assistance.
Full-matrix dynamic dispatch
1 power cabinet → 5 dispensers → 10 connectors. Real-time SOC-based power allocation across every port — no idle power, no over-allocation.
1:5 dispenser configuration
Slim-line dispensers save parking space. Maximises station turnover and reduces driver wait times during shift changes.
Built for Singapore conditions
IP55 rated. Operating range −30°C to +50°C. CCS2 connectors at 360 A / 1000 V with 7.9 m liquid-cooled cable. Noise <65 dB — suitable for urban-edge industrial sites.
TR 25 & OCPP 2.0.1 certified
Singapore TR 25:2022 + TR 25-3 compliant. OCPP 2.0.1 via OCA — interoperable with any global CSMS. Design life 10–15 years; dust and salt-spray protected for the local environment.
Three-tier architecture — built for resilience and local autonomy.
The Charging Station Management System (CSMS) is split across three tiers so that the site continues operating even if cloud connectivity is lost. OCPP 2.0.1 with TLS between every tier.
Cloud platform
Monitoring, analytics, strategy engine, reporting, authority access. Hosted on AWS with secure tenant separation.
On-site infrastructure
EVCS gateway, operator workstations, local fallback server, display terminals. Maintains autonomy if the cloud link drops.
EVCS devices
Power cabinets, dispensers, connectors, on-board local controllers. Local fallback ensures sessions complete and billing reconciles on reconnect.
Advanced device management
Remote access to thousands of internal parameters per charger — module temperatures, coolant flow, fan speeds. Enables predictive maintenance for the 360 kW+ stack rather than reactive failure response.
Plug & Charge (ISO 15118)
Acts as V2G Root CA. Automatic digital certificate exchange on plug-in — no RFID, no QR code, no driver friction.
Smart charging & EMS hooks
Dispatches Charging Profiles to hardware. Max power when PV is high; enforce site-limit when grid load is excessive. Co-ordinated with the EMS, not standalone.
Advanced billing
Time-of-Use pricing, demand charges, idle fees. Full OCPP 2.0.1 transaction compliance. Local fallback keeps sessions billable when cloud is unavailable.
EMS — digital twin, cloud + local, carbon tracking.
A four-layer EMS architecture coordinates PV, BESS, EVCS, lighting, central AC and smart breakers under a single optimisation layer.
Device layer
PV · Wind · ESS · EVCS DC/AC · lighting · central AC · smart breakers — every controllable asset on the site.
Perception & control
Smart Box · LoRa / NB-IoT / 4G/5G/LAN · smart network · meter I/O. Telemetry collection and command issuance.
IsFit middleware
Energy scheduling, EVCS management, ESS management, DG control. The optimisation kernel that the application layer talks to.
Application layer
Flow visualisation, energy billing, carbon footprint, O&M management. Operator and finance-facing.
- · Renewable maximisation — prioritises PV; BESS buffers excess; grid top-up only when needed.
- · Cost optimisation — Time-of-Use arbitrage, peak shaving, demand-charge reduction.
- · Remote & predictive — AI cloud platform with early warnings; no on-site experts required for routine ops.
Global deployments of the equipment stack we integrate.
The PV + BESS + EVCS technologies EVhubs specifies and integrates are deployed at scale globally. These are reference deployments of the underlying equipment stack — not EVhubs's own projects — but they evidence the field-readiness of the hardware we put on a Singapore site.
China Tower BESS
Nationwide, China
PCS + APF + SVG + EMS + PDU + containerised ESS.
Application: base-station energy storage at telco-network scale.
Shaoguan Substation
Guangdong, China
2500 A vanadium flow battery + PCS + EMS + fire protection.
Application: battery secondary utilisation at grid substation.
PV Storage & Charging
China
PCS + LFP battery + PV + V2G + EMS — integrated single-site stack.
Application: PV + Storage + Charging Station.
California ESS + EVCS
California, USA
1 MW gas gen + 1 MW PCS/STS + 1.86 MWh battery + EVCS (6 × 360 kW, 10 × 180 kW).
Application: ESS + Charging Station with on-site generation backup.
Nantou Supercharging
China
480 kW liquid-cooled CCS supercharger station.
Application: parking-lot ultra-fast charging.
Beijing Jiangzhuang Lake
Beijing, China
480 kW liquid-cooled supercharging station.
Application: public ultra-fast charging hub.
These reference deployments demonstrate the field-readiness of the underlying PCS, BESS, MPPT, EVCS and EMS subsystems EVhubs specifies and integrates into Singapore industrial sites.
We architect the full stack — talk to us early in the design.
If your site is heading toward a PV + BESS + EVCS integration, the earlier we are in the design conversation, the more degrees of freedom remain to size the stack against actual fleet duty cycle and tariff structure.