EV Managed Charging Savings Calculator

Quantify avoided energy spend and demand charges from managed EV charging that reshapes load away from peak periods.

Kilowatt-hours moved from peak to off-peak windows by managed charging.
Retail or tariff rate during peak hours.
Rate during off-peak windows when charging is rescheduled.
Peak kW trimmed by staggered charging; defaults to 0 when blank.
Tariff demand charge applied to the facility peak; defaults to $0 when blank.

Financial planning aid. Reconcile outputs with utility tariffs and demand metering data before booking savings in budgets.

Examples

  • 42,000 kWh shifted, $0.23/kWh peak, $0.11/kWh off-peak, 75 kW demand reduction at $18/kW ⇒ Energy savings $5,040.00, demand savings $1,350.00, total $6,390.00.
  • 18,000 kWh shifted, $0.18/kWh peak, $0.12/kWh off-peak, demand inputs left blank ⇒ Energy savings $1,080.00 with no demand component.

FAQ

How do I estimate shifted kWh?

Use telematics or charger logs to measure energy delivered during controllable windows over a representative month. Aggregators can export these figures directly.

Can I include vehicle-to-grid exports?

Yes. Treat exported energy as shifted kWh with the peak rate equal to the avoided retail tariff and the off-peak rate equal to any remuneration or opportunity cost during discharge.

Why might demand savings be zero?

If you leave demand inputs blank or set either the reduction or rate to zero, the calculator conservatively assumes no demand-charge benefit to avoid overstating savings.

Additional Information

  • Result unit: dollars per month broken into energy and demand components.
  • Energy savings rely on the differential between peak and off-peak rates; if the differential is negative, the calculator treats it as zero to avoid unrealistic penalties.
  • Demand savings require both a non-zero reduction in kW and a tariff demand rate; leaving either blank yields zero demand savings.

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