EV Charging Site Feasibility Calculator
Whether the charging rate you are considering matches how long vehicles actually stay. Dwell time decides the technology at a site, and almost every other consideration is a constraint on executing that choice.
The most common finding is that a lower rating would serve the site just as well, which frees supply capacity for more bays.
Your numbers
Median dwell at this site, not the maximum. For a workplace this is a working day; for a forecourt it is minutes.
Not the battery size. What a vehicle actually needs to replace on a visit, which for daily commuting is usually a small fraction of the battery.
For example 7.4, 11, 22 for AC, or higher for DC.
On AC the vehicle's onboard charger caps this, and it is frequently lower than the point rating. Enter the lower of the two if unsure.
Result
Enter your numbers to see a result.
This answers one question: is the rate sufficient for the dwell. It does not tell you whether the supply supports that rating across the bay count you want, which is a separate calculation, or whether the site is commercially viable.
This tool contains no assumed tariffs, costs, utilisation rates or diversity factors. Every figure above is arithmetic on what you entered. Nothing is sent anywhere; the calculation runs in your browser.
Two things worth checking
- The vehicle caps the rate on AC. A high-rated point serving vehicles that accept less delivers less while still consuming the supply its rating implies.
- If the result says the rating is sufficient, try a lower one. Where dwell is long, a lower rating usually covers the same need and lets the same supply serve more bays.
- Energy needed is not battery size. A large battery on short daily routes needs far less replacement than its specification suggests.
- If no AC rating covers the dwell, the question becomes DC, which is a different capital and supply proposition.