Calculating Group Power Management Requirements for Existing Systems
To calculate power supply requirements per number of Wall Connectors for existing electrical systems, use the following equation:
| Available continuous amperage: | Number of Wall Connectors: | Max amperage output per Wall Connector when 100% utilized: |
| _____________________ ÷ ________________________ = ________________________ | ||
Note
Maximum number of Wall Connectors
for group power management is 6.
Note
When calculating maximum amperage
per Wall Connector, 100% utilization must be greater than 6 amps for group power
management operation. If maximum amperage is greater than 32 amps,
group power management is not necessary.
For large scale sites, consider expected parking time in relation to a 100% utilization rate.
| Expected Park Time (hours) | Examples | Recommended Amperage per Wall Connector at 100% Utilization |
|---|---|---|
| 6+ (long term) | Long term parking, overnight parking | 12+ amps |
| 3-5 (medium term) | Workplace, hospitality | 24+ amps |
| 1-2 (short term) | Shopping and dining | 32+ amps |
Note
100% utilization represents the worst case scenario for charging speeds, where the
least amount of power would be available for each individual vehicle. In most
situations, not all Wall Connectors would be actively charging a vehicle, which
enables faster charging for the remaining vehicles.