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I put in my own 240V Level 2 charger (it's actually an interface called an EVSE, the charger is in the car.) This is what I did:
- Installed a 40A 240V breaker in my main panel (main breaker off, used a headlamp)
- Bought the two types of #8 wire I needed online, for running through the basement (2 conductor plus ground) and running underground in plastic conduit
- Bought the conduit and junction boxes locally
- Dug a trench 18” deep from where I drilled a hole through the foundation to where I placed the PT 4x6 post that I mounted away from the house where we park, and placed the conduit in the trench, then fished the single conductor wires through the conduit, then backfilled
- Mounted the charger (Clipper Creek) on the post and wired it to the junction box
It cost me under $1,000 and a day and a half of work. Charging time is roughly inversely proportional to the square of the voltage, so 240V is close to four times faster than 120V
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