I have not seen the following all in one place:
DO NOT BASE YOUR INSTALLATION ON THIS POST. Hire a qualified electrician, and/or read the Tesla install guides and all applicable codes yourself.
Also, I was curious about the cost difference of 100A vs 50A service (assuming the supplying panel is capable) because I've ordered two chargers in my car and my neighbor ordered one. Yes, a neighborhood friend ordered an S85D just a week or so ago. So, here's an example calculation for my house, which will have approximately 70 feet of conduit/wire run between the panel and the wall charger. Costs are rough, and based on "big box" (Lowes/Home Depot) pricing, parts only:
TESLA Wall Connector (2015 version and later) installation wiring suggestions (USA Only) | |||||||||
Breaker Size | Copper THHN Wire Size (US NEC) | Bare Copper Ground Size | Conduit Size (US NEC) | Amps to Car | kW to Car | Miles Per Hour (Single) | Miles Per Hour (Dual) | Full Charge Hours Single 85 | Full Charge Hours Dual 85 |
20 | 12 | 12 | 1/2 | 16 | 3.8 | 11 | 11 | 24 | 24 |
30 | 10 | 10 | 1/2 | 24 | 5.8 | 17 | 17 | 16 | 16 |
40 | 8 | 10 | 1/2 | 32 | 7.7 | 23 | 23 | 12 | 12 |
50 | 6 | 10 | 3/4 | 40 | 9.6 | 29 | 29 | 10 | 10 |
60 | 6 | 10 | 3/4 | N/A for Tesla Wall Connector | |||||
70 | 4 | 8 | 3/4 | N/A for Tesla Wall Connector | |||||
80 | 4 | 8 | 3/4 | 64 | 15.4 | 29 | 47 | 10 | 6 |
90 | 3 | 8 | 1 | N/A for Tesla Wall Connector | |||||
100 | 3 | 8 | 1 | 80 | 19.2 | 29 | 58 | 10 | 5 |
- For THHN wire. Which must be in conduit. If you use something else, EVERYTHING changes, and none of this applies.
- This is for currently shipping (2014 and 2015) Tesla Wall Connectors only. If you are installing an older wall connector, an outlet, whatever... none of this applies.
- kW calculated for 240V, which is commonly found in homes in USA. Commercial is usually 208V. Installs in a commercial building will have slightly different kW to the car.
- All MPH and charge times are from Tesla publications (not calculated)
- Extra long run (over 100 feet)... unusual temperatures... dragons regularly flame your garage... none of this applies.
DO NOT BASE YOUR INSTALLATION ON THIS POST. Hire a qualified electrician, and/or read the Tesla install guides and all applicable codes yourself.
Also, I was curious about the cost difference of 100A vs 50A service (assuming the supplying panel is capable) because I've ordered two chargers in my car and my neighbor ordered one. Yes, a neighborhood friend ordered an S85D just a week or so ago. So, here's an example calculation for my house, which will have approximately 70 feet of conduit/wire run between the panel and the wall charger. Costs are rough, and based on "big box" (Lowes/Home Depot) pricing, parts only:
Example Cost in DFW area - Parts Only | ||||||||
Breaker Size | Home Depot Cost Per Foot of wire | Feet at Example House | Total for Wire Only | Estimate for Conduit & Fittings | Estimate for Breakers | Wiring Total | Tesla Wall Connector | Total Total |
20 | $0.39 | 70 | $81.90 | $30.00 | $10.00 | $121.90 | $750 | $872 |
30 | $0.49 | $102.90 | $30.00 | $12.00 | $144.90 | $895 | ||
40 | $0.59 | $123.90 | $30.00 | $14.00 | $167.90 | $918 | ||
50 | $0.89 | $186.90 | $50.00 | $20.00 | $256.90 | $1,007 | ||
60 | ||||||||
70 | ||||||||
80 | $1.19 | $249.90 | $50.00 | $30.00 | $329.90 | $1,080 | ||
90 | ||||||||
100 | $1.39 | $291.90 | $75.00 | $40.00 | $406.90 | $1,157 | ||
14.90% | ||||||||
Cost increase for 50 to 100 amp, parts ONLY. ^^^^^ |
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