EV Charging Solutions (BS 7671 Section 722)

Q: How long does it take to charge an electric car on a 22 kW AC charger vs a 120 kW DC charger?

A 22 kW AC charger adds approx. 100–120 km of range per hour (ideal for 3–4 hour office/mall parking). A 120 kW DC fast charger charges an EV battery from 10% to 80% in just 20 to 30 minutes.

Overview

Electric Vehicle (EV) Charging Solutions

As electric mobility accelerates across East Africa with electric buses, commercial fleets, and private EVs, dependable charging infrastructure is crucial. Nairobi Power Engineers designs, supplies, installs and commissions turnkey Electric Vehicle Supply Equipment (EVSE) for commercial plazas, residential developments, and fleet depots.

Engineered strictly in compliance with BS 7671:2018+A2:2022 (Section 722) and IEC 61851 standards, our EV charging stations feature Type 2 Mode 3 AC wallboxes (7.4 kW to 22 kW) and DC fast chargers (30 kW to 240 kW CCS2) with built-in Type B 6mA DC leakage protection, open-PEN fault detection, and OCPP 1.6/2.0 smart billing integration.

Product Lineup

Equipment & Range Highlights

Commercial & Domestic • 7.4kW – 22kW

Smart AC EV Wallboxes (Mode 3 Type 2)

Single-phase (7.4 kW) and three-phase (22 kW) smart AC charging wallboxes with RFID user access, dynamic load balancing, and OCPP cloud billing.

Power7.4 kW (1-Ph) / 22 kW (3-Ph)

SocketType 2 Shuttered (IEC 62196)

ProtectionBuilt-in 6mA DC RDC-DD

Fleet & Public Highway • 30kW – 240kW

Commercial DC Fast Charging Stations

High-power DC rapid chargers with dual CCS2 charging guns, liquid-cooled power modules, 10-inch touchscreens, and credit card payment terminals.

Capacity30 kW to 240 kW DC

ConnectorsDual CCS2 / CHAdeMO

ProtocolOCPP 1.6J / 2.0.1 Cloud

EVSE Standards

EV Charging Technical Reference

Parameter	AC Smart Wallbox (7.4kW / 22kW)	DC Fast Charger (60kW – 240kW)
Charging Mode & Standard	Mode 3 (IEC 61851-1 / BS 7671 Sec 722)	Mode 4 DC Rapid (IEC 61851-23 / 24)
Electrical Input	230V 1-Ph 32A / 400V 3-Ph 32A (50 Hz)	400 V AC 3-Phase + Neutral (50 Hz)
Connector Interfaces	Type 2 Socket / Tethered 5m Cable (IEC 62196)	Dual CCS Combo 2 Guns (Heavy Duty Flexible)
DC Residual Protection	Internal 6 mA DC RDC-DD + Type A 30mA RCBO	Complete galvanic isolation & continuous insulation monitoring
Smart Load Management	Dynamic load balancing with building master meter	Matrix power sharing across dual charging guns
Enclosure & Protection	IP54 / IP65 • IK10 Vandal-Resistant Polycarb/Steel	IP54 Heavy Outdoor Powder-Coated Steel Kiosk

Key Features

Engineering & Build Highlights

Built-in 6mA DC residual direct current detecting device (RDC-DD) eliminates the need for expensive external Type B RCDs
Open-PEN conductor fault protection conforms to BS 7671 Section 722 without requiring separate earth rods on PME supplies
Dynamic Load Balancing (DLB): throttles charging speed automatically to prevent tripping the building main transformer
OCPP 1.6J / 2.0.1 compliant: connects with M-Pesa mobile payment platforms and third-party EV charging network operators
Solar EV charging integration: charges vehicles exclusively from surplus rooftop solar power generation
RFID card authentication and smartphone app control with automated billing and session reporting

Applications

Target Applications & Sectors

Commercial shopping malls & office parking complexesElectric bus, delivery van & taxi fleet charging depotsHighway service stations & rest stops across KenyaResidential apartment blocks & private residential villasHotel resorts & hospitality valet parking amenitiesCorporate headquarters employee vehicle charging bays

FAQs

On PME (TN-C-S) utility grids, a broken neutral wire can energize the vehicle metal chassis to 230V, creating a deadly electrocution hazard. Open-PEN protection detects supply unbalance and instantly isolates all phases, neutral, and earth in < 4 seconds.