# Home Charging System / Charger Kit

#### ajdelange

##### Well-known member I currently have a Clipper Creek hcs 40 charger for a Nissan Leaf. I have 50 amp wire leading into it. Any need to upgrade for a CT?
Not really. The biggest Level 2 chargers being sold these days are 48 A which isn't that much bigger. An extra 8 amps is 8*240 = 1920 Watts Estimating 450 Wh/mi for the CT that amounts to an additional 4.3 miles per hour spent charging. Besides which a 40 A charger is the biggest you can have on a 50 A circuit.

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#### FN2187

##### New member How far will you drive, on average, in a day?
That will determine if in an 8 to 12 hour period you can charge back your average daily use.
I will drive about 50 to 70 miles per day.

• ldjessee

#### ldjessee

##### Well-known member I will drive about 50 to 70 miles per day.
Even my Leaf, plugged into a 110 socket, can get that charge in 8-12 hours, so I would not be worried about it.

#### ajdelange

##### Well-known member I will drive about 50 to 70 miles per day.
Let's take 70 miles. At 450 Wh/mi you will need 70*450 = 31500 Watt hours which is 31.5 kWh hours to replace that. A 40 amp charger delivers 40*240 = 9600 W i.e. 9.6 kW. Thus the time to charge with a 40 A charger is 31.5/9.6 = 3.28 h. If you went to the maximum capability of a current Tesla production vehichle, 48 amps (which would require a 60 A circuit), it would take 3.28*40/48 = 2.73 hours or 17% less time.

• Sirfun

#### FN2187

##### New member Let's take 70 miles. At 450 Wh/mi you will need 70*450 = 31500 Watt hours which is 31.5 kWh hours to replace that. A 40 amp charger delivers 40*240 = 9600 W i.e. 9.6 kW. Thus the time to charge with a 40 A charger is 31.5/9.6 = 3.28 h. If you went to the maximum capability of a current Tesla production vehichle, 48 amps (which would require a 60 A circuit), it would take 3.28*40/48 = 2.73 hours or 17% less time.
Thank you. Definitely not worth the upgrade at this point.

#### Sirfun

##### Well-known member Let's take 70 miles. At 450 Wh/mi you will need 70*450 = 31500 Watt hours which is 31.5 kWh hours to replace that. A 40 amp charger delivers 40*240 = 9600 W i.e. 9.6 kW. Thus the time to charge with a 40 A charger is 31.5/9.6 = 3.28 h. If you went to the maximum capability of a current Tesla production vehichle, 48 amps (which would require a 60 A circuit), it would take 3.28*40/48 = 2.73 hours or 17% less time.
Thanks for doing the hard math for me. The magic number is 17%, but then again with your math I was able to do multiples of 70 also. So, 70x4=280 miles is still only 13.12 hours to replenish. So 40 A charger is fine. Of course this is based on 450 Wh/mi which seems reasonable. Thanks Again.