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Now, let’s assume your EV has a 10kWh battery pack that has a C rating of 0.25.

The power this EV can accept when charging is 0.25*10 (battery capacity) = 2.5kW.

No matter how powerful the charging station is, your EV can only take in an average power of 2.5kW to fully charge in 4 hours. It’s impossible to fully charge it in less than 4 hours & pump in more than 2.5kW of power.

Even if someone wanted to charge the above mentioned EV using a 50kW DC fast charger, its *actual* utilisation would only be: (2.5kW/50kW)*100 = 5%.

larger charger faster charging

Operating window (mins)

Slow Charger
Fast Charger
Rapid Charger

Operating window

960
960
960

Time To Charge (mins)

240
60
15

Utilization

30%
30%
30%

Charges/Day

Number of times you can charge per day
1.20
4.80
19.20

Number of Charger

1
1
1

Number of Guns/Charger

1
1
1

Charger Power needed

Error factor of 0.9 is divided to get power needed
2.8
11.1
44.4

Capital Expenditure

Charger cost

Based on charger power level
₹ 33, 333
₹ 133, 333
₹ 533, 333

Incoming Line Capacity

Cost of charger hardware per kW X Charger Power needed

Based on charger power level
3
14
56

Power Infrastructure

Average Rs. 12500/KVA for low power lines. And Rs. 9500/KVA for high power lines

Again because many overheads and labour remains same irrespective of power level. Here assumed flat rate for simplicity.
₹ 43, 403
₹ 173, 611
₹ 694, 444

Expected depreciation cycle

5 years
5 years
5 years

Depreciation / year

₹ 15, 347
₹ 61, 389
₹ 245, 556

Charges / year

438.0
1752.0
7008.0

Fixed Operating Expenses

Demand charges

Bangalore's Demand Charge - Monthly fixed demand charges needed to pay to a discom for a live power connection. Even with zero usage.
₹  3,333
₹  13,333
₹  53,333

Rent on Space

Rent on Standard Parking Space
₹  36,000
₹  36,000
₹  36,000

Overheads

Monthly fixed overheads covering - maintenance, software licenses and upkeep. Gun replacement is the biggest maintenance, which rapid chargers have higher due to higher engagements and disengagements.
₹  36,000
₹  60,000
₹  72,000

Total Fixed Operating Expenses

₹  90,681
₹  170,722
₹  406,889

Annual Energy Throughput

4,867
19,467
77,867

Unit Cost of Energy

₹  18.63
₹  8.77
₹  5.23