Worked example
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Minimum site headroom for charging
30 kW
- Interval with the least headroom
- 5 of 8
- Full-power chargers at that interval
- 1 chargers
- Site-side charging energy, theoretical upper bound
- 230 kWh
- Capacity after the entered reserve
- 450 kW
Assumes continuously adjustable, fully available chargers and usable interval-average headroom throughout each interval. Subinterval peaks, minimum modulation and vehicle or departure constraints remain separate.
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Method and assumptions
Formula
dispatchable charging = max(0, min(charger fleet kW, site capacity − reserve − baseline kW))This is an active-power worksheet; it does not perform a network, phase, protection or diversity study.
Limits of this result
- Import capacity, reserve and baseline must use the same active-power boundary with positive import and negative export.
- The result does not check phase unbalance, voltage, transformer thermal duty, harmonics, protection, cables or connection agreements.
- A dispatch controller also needs charger availability, vehicle energy/departure needs, command acknowledgement and a safe communications-failure state.
- The integrated value is a theoretical site-side charging-input upper bound from interval-average baseline data; it cannot reveal subinterval peaks or conversion losses.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.