Home Charging — the honest guide
Most "how to charge a Tesla" articles are written by people selling chargers. This isn't.
In this section
🧮 Calculators
7 interactive tools — cost, savings, cold-weather range, road trip planner, battery degradation, tax credit eligibility.
Outlets & Safety
NEMA 14-50 vs 6-50 vs hardwire. Why cheap outlets melt. How to pick one that doesn't.
Chargers Reviewed
Tesla Wall Connector, ChargePoint, Grizzl-E, Emporia — honest pros and cons.
Public Networks
Electrify America, EVgo, ChargePoint, FLO. What you need for road trips.
Supercharger Map
Every Tesla Supercharger worldwide. 10,500+ sites with V2/V3/V4 ratings, Magic Dock filter, ABRP deep-links for live availability.
US States
Incentives, utilities, and rebates for all 50 states plus DC.
Canadian Resources
Federal iZEV, provincial incentives, Canadian networks.
TL;DR
You probably need a 240V circuit, not a Wall Connector at maximum amperage. For most people, a 30A or 40A circuit is plenty. Going bigger than you need costs hundreds of dollars in wire and possibly thousands in a panel upgrade — and adds zero useful range overnight.
How power gets from the grid to your car
Understanding what each part does helps you have the right conversation with your electrician. Here's the simplified path:
How fast does each charging level actually charge?
Here's the real-world picture for a 2021+ Model Y Long Range (11.5 kW max onboard charger). Range numbers assume mild weather; subtract 30-40% for hard Vermont winter conditions.
Reality check
If you drive 40 miles a day and have 8 hours overnight, a 24A circuit already adds 120 miles overnight. You'd be paying for wire and breakers you'll literally never use if you go to 48A.
Visualizing the gap
The chart below shows real-world miles-of-range gained per hour of charging. Note how dramatic the jump is from Level 1 (120V) to even the slowest 240V option:
Quick decision: what circuit do I actually need?
Can your home electrical handle it?
Walk through these in order before calling an electrician:
1. Find your main breaker
Look at your electrical panel. The biggest breaker at the top (usually a double-wide switch) is your main service breaker. The number on it (60, 100, 150, or 200) is your house's total amperage capacity.
- 200A service: Almost always supports a 48A Wall Connector at full speed.
- 150A service: Usually fine for 40A or less. Run a load calc to be sure.
- 100A service: A 40A or 48A circuit might work but you'll likely need a load calc, and electric heat/AC/dryer usage may force a smaller circuit or a service upgrade.
- 60A or smaller service: You can absolutely still charge — but realistically you're limited to 20A or 24A, OR you need a service upgrade ($2,500-6,000+).
💡 100A or 125A service in Vermont? Read this before spending $4,000 on a panel upgrade.
The ConnectDER meter collar taps power outside your panel and adds a 32A continuous EV circuit without touching the existing service. Approved by Green Mountain Power, takes 15 minutes to install, costs ~$800–1,200 all-in vs $3,000–6,500 for a full service upgrade. Made for old houses with full panels.
2. Count your big loads
What else is on the panel that uses a lot of power? Each of these typically eats significant amperage when running:
- Electric range/oven (40-50A)
- Electric clothes dryer (30A)
- Electric water heater (30A)
- Central air conditioner (15-50A depending on size)
- Electric heat pump (20-50A)
- Hot tub (30-50A)
- Well pump (15-30A)
The NEC has formulas for how to size a service with all these loads + EV charging. Your electrician will run an NEC 220 load calculation — if they don't mention this, that's a yellow flag.
3. Where will the charger go?
Measure the cable run from your panel to where the car will park:
- Under 50 feet: Standard wire sizes work fine.
- 50-100 feet: Acceptable, but you might need to upsize one wire gauge for voltage drop.
- Over 100 feet: Expect to upsize wire 1-2 gauges. Cost goes up notably.
- Over 200 feet: Consider whether you'd rather upgrade the service to a closer location.
What to tell your electrician
Half of residential electricians have done dozens of EV installs. The other half are guessing. These questions weed out the guessers before they show up.
Ask before booking
- "How many EV chargers have you installed in the past year?" (you want a number, not "a bunch")
- "Will you run an NEC 220 load calculation?" (correct answer: yes, always for any new continuous load over 30A)
- "Do you derate the breaker for continuous load?" (correct answer: yes, 80% per NEC 625.40 — a 48A continuous charger needs a 60A breaker)
- "Will you hard-wire or use a NEMA 14-50 outlet?" (either is fine, but hard-wire is more durable; ask their reasoning)
- "Will you pull a permit?" (correct answer: yes, always for a new dedicated circuit)
Red flags
- "You don't need a permit, it's just a new outlet" — wrong. New dedicated 240V circuits require a permit in essentially every jurisdiction.
- "NEMA 14-50 doesn't need to be GFCI-protected" — wrong since 2020 NEC. Receptacles in garages need GFCI.
- "50A breaker is fine for the Wall Connector at 48A" — wrong. Continuous load = 80% derate = 60A breaker required for 48A continuous.
- Quote that doesn't itemize wire, breaker, conduit, labor, and permit separately.
What NOT to do
- Don't use an extension cord for Level 2 charging. Even short ones cause voltage drop, heat buildup, and have caused house fires. The Mobile Connector is specifically not rated for extension cord use.
- Don't share a circuit with anything else. The EV needs its own dedicated breaker. No, the dryer outlet "isn't being used during the day."
- Don't undersized the breaker for the wire OR the wire for the breaker. They have to match. A 60A breaker on 8 AWG wire is a fire waiting to happen.
- Don't run THHN underground. THHN is dry-location only. Use UF-B for direct burial, or run THWN-2 inside conduit.
- Don't connect a Wall Connector to a generator without checking compatibility. Most portable generators can't handle the inrush current. Whole-house standby generators can usually be configured to charge at reduced amperage.
- Don't DIY a service upgrade. Replacing your main panel or upgrading from 100A to 200A involves working live or coordinating a shutoff with your utility — this is what licensed electricians are for.
- Don't skip the load calculation. "It'll probably be fine" is how breakers trip on Christmas morning when the oven, dryer, and EV are all running.
- Don't install in a non-grounded outlet (older homes with 2-prong receptacles). The Mobile Connector needs a proper ground.
If you're going to DIY anyway...
We strongly recommend a licensed electrician. But if you have the legitimate skills, experience, and are pulling the proper permits — here's what you need to know.
Legal disclaimer
This is reference information, not professional advice. Many jurisdictions require a licensed electrician for new 240V circuits regardless of skill level. Homeowner permits are available in some states but not all. Check local code before starting. Working on a live panel can kill you.
Wire sizing (copper, 75°C column NEC table 310.16)
How big is each wire gauge, really?
AWG numbering is counter-intuitive: smaller number = thicker wire. Here's the actual diameter of each gauge of copper wire, shown to scale. Notice how dramatically 6 AWG is bigger than 14 AWG — that's why 6 AWG is also noticeably more expensive per foot.
Conduit type for the run
- Indoor / garage: EMT (steel) or Schedule 40 PVC. Both are NEC-approved.
- Outdoor exposed: EMT with weatherproof fittings, or Schedule 80 PVC.
- Direct burial: UF-B cable (no conduit needed) OR USE-2 individual conductors in dirt OR THWN-2 in Schedule 40 PVC at 18" depth.
- Under driveways: Schedule 80 PVC at 24" depth, or Schedule 40 at 18" depth.
State-specific resources
Utility programs, rebates, and TOU rates vary wildly. We've compiled a complete state-by-state guide covering all 50 states plus DC with verified links to authoritative sources: