How Big A Box Transformer Should Be Used For A 1-To-8 Charging Station?
04-30 2025 | By:
1. Professional answer: How to scientifically calculate the capacity of the box transformer?
For the “one-to-eight” charging pile scenario that users are concerned about, we recommend the following steps for accurate calculation:
Power benchmark calculation
DC fast charging pile: single-gun power 120kW (mainstream model)
AC slow charging pile: single-gun power 21kW (national standard model adaptation)
Typical configuration plan
Scheme A: full DC fast charging (8×120kW)
Total power demand: 960kW
Requirement coefficient is 0.7 (national standard recommended value)
Calculated load: 960×0.7=672kW
Apparent power: 672/0.9≈750kVA
800kVA box transformer
It is recommended to use 800kVA box transformer
Scheme B: Hybrid configuration (4 fast charging + 4 slow charging)
Fast charging load: 4×120×0.7=336kW
Slow charging load: 4×21×0.9=75.6kW
Total calculated load: 411.6kW
Apparent power: 411.6/0.9≈457kVA
Recommended to use 500kVA box transformer
II. Product advantages: Core competitiveness of intelligent box transformer
Our charging pile dedicated box transformer adopts modular design, which meets market demand:
Dynamic load adjustment system
Equipped with intelligent power distribution module (IPDM)
Real-time monitoring of the use status of each pile
Automatically optimize power distribution
More The system saves 15%-20% energy
Full-scenario adaptability
Voltage level: 10kV/20kV/35kV flexible configuration
Capacity range: 315kVA-2500kVA module combination
Protection level: IP54 outdoor protection standard
Temperature control system: -40℃~+45℃ wide temperature range operation
Smart operation and maintenance system
Remote monitoring platform (supports Web/APP dual-end)
Fault self-diagnosis system (accuracy ≥98%)
Power quality analysis module
Preventive maintenance reminder function
Typical case: a charging station in a logistics park
Configuration plan: 6 180 kW DC charging pile + 2 40kW AC charging piles
Equipment selected: Smart Secondary Unit Substation Box Type Transformer Substation
Operation data: average daily charging volume 4200kWh
Energy conversion efficiency: ≥96%
Fault response time: <15 minutes (remote diagnosis)
IV. Future upgrade planning outlook
Our European Box-Type Transformer E-House products have integrated:
Photovoltaic storage and charging integrated interface
V2G bidirectional inverter module
5G communication edge computing unit
Carbon footprint monitoring system
Choosing our Outdoor Box type Substation can not only meet the current “one to eight” operation needs, but also reserve 20% capacity space for subsequent expansion. Through the energy efficiency management system, it is expected that the operating cost can be reduced by 18%-25% within 3 years, helping customers to build efficient, intelligent and sustainable new energy infrastructure.
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