EV charging energy and power-window calculator
Start with daily energy and usable charging hours. This tool checks an aggregate energy budget; it does not size a charger, transformer, cable or protective device.
Defaults are an illustrative example, not measured site data. Energy is delivered at the charger output; vehicle/battery losses are not included. Efficiency is an assumption, not a Xiaochong performance guarantee. All vehicles are treated as if they can use the full window.
Planning results
- Daily delivered energy (kWh)
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- Average DC output (kW)
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- Average AC input (kW)
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- AC budget after reserve (kW)
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- Budget minus average AC need (kW)
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Example only: 12 × 25 kWh ÷ 8 h = 37.5 kW DC; at 92% assumed efficiency, about 40.8 kW AC.
Energy = vehicles × kWh per vehicle. Average DC = energy ÷ hours. Average AC = average DC ÷ efficiency. AC budget = available headroom × (1 − reserve). Margin = budget − average AC.
Excluded: individual session scheduling, battery charging curves, phase balance, power factor/kVA conversion, harmonics, starting transients, thermal limits, earthing and protection. Do not use this tool for live electrical work or generator/solar/storage connection approval.
Before asking for a quotation
- Vehicle models, connectors, energy and departure times.
- Site drawing with cable reach, pedestrian routes and maintenance access.
- Engineer-confirmed headroom and actual supply conditions.
- Exact-model documentation, payment/backend needs and commissioning responsibilities.
Market guides
- India
- Ethiopia
- Ghana
- Nigeria
Planning reference
U.S. DOE AFDC: project planning and utility coordination (English)