How Much Does it Cost to Charge?

JimLudden · May 31, 2024

Tideland Prius said: ↑

Electric

MPGe Le/100km kWh/100 miles kWh/100km

1 133 1.8 25.34 16.02

Gasoline/Petrol

MPG L/100km kWh/100 miles kWh/100km

1 54 4.4 62.41 39.16

Assuming:

EPA all-electric range (AER): 25 miles or 40 kilometres
Rated fuel tank size: 11.3 gallons or 43 litres
When the low fuel light comes on: 9.2 gallons or 35 litres
Actual kWh of battery charge from "normal"* hybrid battery SOC to full charge: ~5.5kWh
Wall outlet readout of kWh of battery charge from "normal"* hybrid battery SOC to full charge: ~6.3kWh
*Normal being 6 bars out of 8 for Gen 1/2/3 Prius drivers or about 3/4 of the hybrid portion of the battery indicated on the onboard display.

The EPA uses 33.7kWh per gallon of gasoline for their conversions (8.9kWh per litre of petrol)

Therefore, if you want to calculate your cost, let

A = electricity cost in dollars per kWh
B = Gasoline cost in dollars per gallon
C = Petrol cost in dollars per litre
$ = Cost

Use the following formulas:

1. For cost of electricity per EPA charge

$ = A*25.34/4 (for 25 miles), $ = A*16.02/(100/40) [for 40km]

2. For cost of electricity per EPA charge per mile/kilometre

$ = A*25.34/100 (in miles), $ = A*16.02/100 (in kilometres)

3. For cost of gasoline per full 11.3 gal/43 litre tank

$ = B*11.3 (for gallons), $ = C*43 (for litres)

4. For cost of gasoline per real life tank (i.e. refuel at the low fuel light)

$ = B*9.2 (for gallons), $ = C*35 (for litres)

5. For cost of gasoline per mile/kilometre

$ = 1/54*B (for dollars per mile), $ = C*4.4/100

Example:

A = $0.1/kWh
B = $2.499/gal

Therefore,

1 = $0.634 (or 63.4 cents) per 25 mile charge
2 = $0.025 (or 2.5 cents) per mile
3 = $28.24 per full tank of gas
4 = $22.99 per tank of gas if you refuelled at the low fuel light
5 = $0.046 (4.6 cents) per mile

At 10 cents per kWh and $2.499/gal gas, you're saving almost 50% by using electricity. (46% to be exact).

If you travel 500 miles a month:

And you used electricity for all of those 500 miles, it would cost you $12.68.
And you only drove in hybrid (HV) mode and never charged, it would cost you $23.00
Click to expand...

Because I have solar panels and only charge when they are producing, charging the traction battery costs me nothing -- except the cost of the panels, which I installed to pay for using my heat pump.

sylvaing · Jun 1, 2024

JimLudden said: ↑

Because I have solar panels and only charge when they are producing, charging the traction battery costs me nothing -- except the cost of the panels, which I installed to pay for using my heat pump.
Click to expand...

What size panel do you have?

How Much Does it Cost to Charge?

JimLudden Member

sylvaing Senior Member

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How Much Does it Cost to Charge?

JimLudden Member

sylvaing Senior Member