EV Charging Load Calculator
EV Charging Load Calculator — quick estimate
Reserve electrical capacity for EV charging in parking at design stage. Enter your charger mix and a diversity factor for an instant connected-load, demand and supply estimate.
Your charger mix
Diversity depends on user behaviour, load management and whether smart/dynamic load balancing is used. Use a conservative factor without active load management.
Get this verified by our engineers — free
We'll design the EV feeder, metering and (where useful) smart load management, and confirm the impact on your transformer/DG and sanctioned load.
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Thanks! Our electrical team will send your tailored EV charging load & feeder design within one business day.
Assumptions & formula
Formula: connected load = Σ(charger rating × count). Diversified demand = connected load × diversity factor. Suggested supply (kVA) = demand ÷ 0.9 power factor.
- Charger ratings assumed: AC slow 7.4 kW, AC fast 22 kW, DC fast 30 kW (entry-level; DC fast/ultra-fast spans ~30–360+ kW) — change to match the actual chargers specified.
- Diversity factor is a planning assumption; with smart/dynamic load management the demand can be capped well below the connected load.
- Current estimated at 415 V, 3-phase, 0.9 pf for the diversified demand.
Verify: charger ratings, diversity and load-management strategy are project-specific. Confirm the feeder, protection and the impact on transformer/DG and DISCOM sanctioned load with a licensed electrical engineer (and any EV-readiness norms in your State building byelaws).
Indicative estimate only — not a binding design. Actual load depends on charger selection, simultaneity and load-management strategy.
Need an exact BOQ, rate analysis or measurement sheet?
This is a quick engineering estimate. For tendering, billing or audit, our QS & estimation team prepares an item-wise BOQ, rate analysis and a verified measurement sheet to IS / CPWD norms — backed by 15+ years and ISO 9001:2015 quality processes.