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Assumptions
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* California only: The data pertains to California
region only.
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Charging Hours Selected: Hours in which the vehicles will
charge, as defined by the user. The cost of charging will be spread evenly
over all selected hours. If you do not know the charging schedule, the
default is 8 night time hours.
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Charger Utilization Chart: The Chart manages the number of
hours necessary for your EV miles and how the power from your selected
charger equipment can impact your use case. The light green line illustrates the
charging power equipment and the green bars are the daily hourly charging sessions. The green bars are dynamic and demonstrate if the
hours selected are enough to charge your fleet. If your charging time is too
short you will get an alert and you should add more time or more power.
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Custom Utility rates: There are two custom rate
features: (1) Simple Custom rate, and (2)
Advanced Custom rate. In the Simple Custom Rate you enter only
one rate, the kWh rate. When selected you should enter a blended energy cost
that will be used for all 24 hours, all 365 days per year. That value should
reflect the blended cost of all energy, demand charges, and fixed charges.
One technique to determine your simple custom rate value is to simply divide
a monthly utility bill by the amount of kWh used in that month. In the Advanced Custom rate, you can enter
the following into the 4 input fields:
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Monthly Service:
Any fixed monthly charge for things such as a meter or connection fee
(enter dollars in format XXX, maximum $999)
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kWh Rate: Cost
of utility energy purchased per kWh. This should reflect an average of all
times and seasons. (Enter in denomination of cents in format .xx, maximum
$0.99)
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kW Rate: Cost of utility power, generally charged by capturing the
highest power load recorded (as measured in kW) over the course of the month,
and billed at a fixed rate per kW (known as Demand fees). (Enter dollars in
format XX.xx, Maximum $99.99)
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Sales Tax: The Sales tax % charged by the utility (enter tax % in format
X, maximum 9%)
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Warning Message:
Invalid entries will be shown in the Custom
red-outlined cells. Follow directions for valid entries to run the
calculator.
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Default Use Case: You only have to answer Q1, Q2,
and Q3 to create a use case. The default settings, until otherwise
overridden, are Q1) Two EV Star Shuttles, 100 daily miles per vehicle, 21
days per month. Q2) DCFC 50kW charger, 8 hours of over-night charging
starting at 10pm and ending at 6am. Q3) ICE fuel cost at $3.85 per gallon,
Simple Custom electric utility rate of $.016 per kWh. Any of those settings
can be changed by you.
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Electric Utility Tariff
Rates*: The calculator uses 3 electric tariff
rates designed for EV Commercial vehicles in California's largest utility
companies. The PGE* tariff is BEV-2, the SCE* tariff is EV-TOU-8 which
supports up to 500kW of load from charging and the SDGE* tariff is EV-HP
which will be available on about Dec 2021. The custom rate feature allows for
any rate to be used. Information for entering your custom rate can be found
above in this Section.
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Escalation: The expected annual increase in
the cost of energy. The calculator default assumes a 0% yearly increase in
electric energy, and 0% yearly increase in liquid fuel used in the ICE
calculations.
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EV: Electric Vehicle powered from a battery
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EV Charging:
The charging equipment used to charge the vehicles. Model assumes a ratio of
1 DCFC charger for each 4 vehicles. Model assumes a ratio of 1 to 1 one when
selecting AC charging and each will simultaneously charge. The energy
requirement for the charger(s) is calculated according to the efficiency of
the charger you have selected.
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EV Miles: The number of vehicle miles
traveled in the use case, as defined by the user.
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Fuel Cost: This should reflect the price of
the applicable fuel (diesel, petroleum, propane, gasoline, or any liquid
fuel). The calculator assumes no change over 10 years, so if one has an
expectation of an average price over the next 10 years you should enter that.
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Fuel efficiency: The model assumes the following
fuel efficiencies by classification;
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ICE vehicles
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Class 3: 14 mpg
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Class 4: 11.4 mpg
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GreenPower EV Fuel efficiency by classification
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Class 3: 0.75 kWh/mile
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Class 4: 0.77 kWh/mile
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Class 4 Box/Cutaway: 0.85 kWh/mile
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ICE:
Vehicle powered by an Internal Combustion Engine, fueled by diesel,
petroleum, propane, gasoline, or any liquid fuel.
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kWh: A unit of
energy. The kWh unit is used for the sale or purchase of energy.
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kWh/Mi: An expression of EV vehicle efficiency, reflecting the number
of kWh from the battery needed to propel the vehicle 1 mile under typical
load.
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kWh rate: Rates per kWh vary by
utility, season, month, hour, day of the week, and sometimes change according
to special peak events. When a utility is selected, the Calculator applies a
standard utility rate to all 4 summer months and 8 winter months, for all 7
days at weekday rates. Additionally, the rates are reflected from the
following 4 time periods: 12am to 7:59am, 8am to 3:59pm, peak times
of 4pm to 8:59pm, and 9:00pm to 11:59pm.
You can select a custom rate feature to enter whatever blended rate
you want that will apply to your planned charging hours.
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KW rate: power rates are measured in kW and the Calculator converts a
utility's Subscription or Demand Charge into $/kW. If the Advanced Custom rate is selected
you can enter this yourself.
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LCFS*: A unit of value for a carbon credit (Low Carbon Fuel
Standard), used in California for Carbon trading. California offers credits
for every kWh used to charge EVs. One credit is generated by EV miles driven
when you own the charger. The credits are valued at market rates which are
forecasted to decline over time, and considers both the vehicle type and
vehicle efficiency. The owner of the charger can claim the credits. If a 3rd
party owns the chargers they can claim the credits, so it is advisable to own
your charging infrastructure. If you do own the infrastructure the credits
are paid to you by accredited brokers for each kWh used to charge an EV.
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Maintenance cost: cost per mile for vehicle maintenance. While each vehicle has its own maintenance
requirements, GreenPower vehicles have demonstrated their maintenance cost is
50% lower than a comparable ICE vehicle over a 10 year life.
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Miles Driven: This reflects the average miles
you expect to drive each vehicle per day, or yearly average. This is used to
calculate the energy requirement (kWh) and any LCFS credits. The calculator
is limited to a maximum quantity of 10 vehicles. You can increase the miles
driven if you want to see more miles in your use case.
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MPG:
an expression of vehicle efficiency, reflecting the number of gallons of
Diesel, Petroleum, CNG, Propane, or any liquid fuel needed to propel the
vehicle 1 mile under typical load.
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Operating costs $/mile: This is the operating cost to
include the elements of your use case as well as any Maintenance, LCFS, or
Solar savings options you have selected.
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Peak Time: Peak Time hours vary by Utility
and State. There are different Peak Hourly Time Periods established by each
Utility. Currently in California the Peak Time is 4pm-8:59pm.
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Rounding in Calculator: values are rounded for display, but calculations are performed
in the background by up to 4 significant digits when pertinent.
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Solar Hours: The hours that the sun shines. The calculator determines the
amount of solar needed to satisfy the charging needs according to local
irradiation characteristics. The irradiation will fluctuate by season and day
so when integrated properly the utility energy will be seamlessly used as
needed to compensate. Solar will provide $0/cost 0/carbon energy when
available.
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Total Cost $/mile: This is the operating cost to
include the elements of your use case, as well as any Maintenance, LCFS, or
Solar savings options you have selected
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Disclosures
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Disclosure: No representation or warranty is expressly or impliedly given
as to its accuracy, completeness or correctness.
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Forward-making statements: No representations expressed or
implied as to forward-looking statements, data, estimates, predictions,
projects, performance, savings, or uses in future events or applications
hereby warrants any expectations or possibilities.
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Accuracy: All sources, regarding utility rates and generation of fueling
credits are to be considered to be correct at the time of this publication.
Information relied upon to develop this tool is based on measurements,
analyses, observations, interpretation and conclusions to support its
accuracy. We reserve the right to revise any data at any time and from time
to time without prior notice will update the tool with most current data with
real world information.
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Data Varies: It is based on your region or
application or own use and can vary with each application.
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