Most EV charger installs go smoothly. The ones that go badly nearly always share one cause: the charger was bought before anyone looked at the panel. By the time an electrician is standing in the garage holding a 60 amp unit, the conversation has changed from a half-day install to a service upgrade.
Step one is a load calculation, not a purchase
A load calculation adds up what your service is already committed to — heating, water heating, cooking, air conditioning, laundry, general lighting and receptacle load — and tells you what is genuinely spare. A Connecticut house on a 100 amp service with electric water heating and central air often has less headroom than the owner assumes. A 200 amp service usually swallows a charger without complaint.
This takes an electrician about twenty minutes and it should be free as part of a quote. If capacity is tight you have three real options rather than one: a lower-amperage charger, a load-management device that shares capacity with another large appliance, or a service upgrade. All three are legitimate and they cost very different amounts.
40 amp or 60 amp? Be honest about your driving
| Circuit | Continuous output | Range added per hour | Suits |
|---|---|---|---|
| 32A (40A circuit) | ~7.7 kW | ~25–30 miles | Almost every single-EV household |
| 48A (60A circuit) | ~11.5 kW | ~35–40 miles | Two EVs, or high daily mileage |
| 16A (20A circuit) | ~3.8 kW | ~12–15 miles | Plug-in hybrids, low mileage |
If you drive 40 miles a day and park overnight, a 40 amp circuit refills you in under two hours and the extra capacity is money spent on a number you will never approach. The 60 amp setup earns its keep in two-EV households and for drivers who regularly arrive near empty and leave early.
Hardwired or a NEMA 14-50 outlet?
- Hardwired — no plug to degrade under repeated heat cycling, higher amperage available, better outdoor weather ratings. The right answer for a permanent home install.
- NEMA 14-50 outlet — flexible, works with the portable charger many cars ship with, and you can take the unit with you when you move. Sensible for renters and for anyone unsure how long they will stay.
Permits, and why you want one
Adding a dedicated 240V circuit needs an electrical permit in most Connecticut municipalities, and the inspection is quick. People occasionally ask whether they can skip it. Two reasons not to: it shows up during a home sale, and utility or state incentive programmes generally require proof of a permitted, inspected install. It is a small fee inside a flat quote, not a line worth avoiding.
Buying the charger and the install together from one place is not always cheaper. Get the load calculation first, then buy hardware you know your panel can carry. Our EV charger installation page explains what our flat price covers.
Detached garages and outdoor posts
This is the other cost multiplier. A charger on the wall beside the panel is a two to three hour job. A charger in a detached garage across the yard means trenching to the correct depth with the right cable type, or an overhead feed, plus a small sub panel at the far end in many cases. It is a full day and sometimes more. Worth knowing before you plan where the car will live.
Where the charger should physically go
People tend to decide this last, and it is the biggest single cost variable after panel capacity. A charger mounted on the wall immediately beside the panel is a couple of hours of work. The same charger on the opposite wall of the garage adds conduit and labour. In a detached garage across the yard it becomes a full day with trenching, correct burial depth, the right cable type, and often a small sub panel at the far end.
Think about cable reach too. Most units ship with an 18 to 25 foot cable, which sounds generous until you account for the charge port being on the opposite side of the car from the wall, and for the way you actually park. Mounting height matters as well — high enough that the cable hangs in a loop without kinking, low enough that you are not reaching over your head in February.
Cold weather, and what Connecticut winters actually do
Charging speed drops in cold weather because battery chemistry slows, and many vehicles will spend the first part of a session warming the pack rather than adding range. This is normal and not a fault in your installation. The practical implication is that overnight charging in a cold garage takes longer in January than in July, which is another argument for scheduling charging to finish shortly before you leave rather than immediately when you plug in.
Outdoor installations need genuinely weather-rated hardware, not indoor equipment with sealant around the edges. Look for an appropriate enclosure rating on the unit itself and proper weatherproof fittings on the conduit and box. Water ingress into an EVSE is an expensive and entirely preventable failure.
Mistakes that cost people money
- Buying the charger first. Get the load calculation, then buy hardware you know the panel can carry.
- Over-specifying amperage. Paying for a 60 amp circuit to charge a car that never needs more than 32 amps is money spent on a number you will not use.
- Skipping the permit. It surfaces at resale and generally disqualifies you from incentive programmes.
- Ignoring a second EV. If a second electric car is likely within a few years, running the capacity now is far cheaper than a second project later.
- Self-configuring the amperage. Setting a unit above what the circuit is rated for is a genuine fire risk, and it is easy to do in a phone app.