Home vs public charging

Public DC fast charging typically costs several times the per-kWh price of residential electricity, and in some markets it approaches the per-mile cost of gasoline. That is the fact that decides how much home charging is worth to you, and it is why the effort of finding any reachable outlet usually pays for itself.

We are not going to publish a per-kWh public charging price, because it varies by network, by state, by time of day, by membership tier and by whether the session is billed by energy or by minute. Run the arithmetic with the price on the screen in front of you instead.

Watch for per-minute billing, which punishes a car that charges slowly or a session that continues past the fast portion of the curve. And watch for idle fees, which are reasonable in principle and expensive when you forget.

Quick picks

Ranked, with the reasoning underneath. Tap any row to jump to that write-up; tap the price to check it on Amazon. Prices come from the live layer, never from this page.

#	Product	Best for	Type	Price
1	Lectron Portable Level 1 J1772 Charger (15A, NEMA 5-15)The unglamorous answer that covers most commutes: an ordinary 120V socket, overnight, and no conversation with anybody about electrical work.	An ordinary wall socket	Level 1 EVSE	Check price#ad
2	Lectron J1772 to Tesla (NACS) AdapterThe opposite direction, and the one Tesla drivers actually need: it lets a NACS car take the J1772 cable that most workplaces and older buildings already have.	A Tesla at a J1772 station	AC charging adapter	Check price#ad
3	Lectron Tesla (NACS) to J1772 Adapter, 48AThe adapter a J1772 car needs to use a Tesla wall, destination or mobile connector — which is the direction many apartment buildings have already installed.	A J1772 car at a Tesla cable	AC charging adapter	Check price#ad

#1 · An ordinary wall socket

Lectron Portable Level 1 J1772 Charger (15A, NEMA 5-15)

The unglamorous answer that covers most commutes: an ordinary 120V socket, overnight, and no conversation with anybody about electrical work.

Published specifications for the Lectron Portable Level 1 J1772 Charger (15A, NEMA 5-15), each linked to its source

Input	120V, 15A maximumsource
Output power	1.8 kWsource
Cable length	16 ftsource
Plug / connector	NEMA 5-15 plug, J1772 connectorsource
Certification	UL 2594 / UL 2231 certifiedsource
Manufacturer charge-rate claim	45+ miles of range overnightsource

What those numbers mean

1.8 kW sounds trivial next to 9.6 kW, and for a road trip it is. For a commute it usually is not: the average US driver covers well under 45 miles a day, and this replaces that overnight while the car sits anyway.

The honest ceiling is the socket, not the cable. A 15 amp household circuit shared with a refrigerator and a space heater will trip, and the fix is a different socket rather than a different charger.

This is the only category of EV charging that is genuinely invisible to a landlord. It draws less than a hair dryer and plugs into a receptacle that already exists.

What it does well

• Works with a socket that already exists, everywhere, with no permission needed
• UL 2594 and UL 2231 certified rather than a generic cordset
• Cheapest possible entry into home charging, by a wide margin

What it does not

• 1.8 kW will not recover a long driving day overnight
• 16 ft cable, and the nearest 120V socket is often not the nearest thing to the car

Skip this one if: You regularly drive more than about 45 miles a day. Level 1 will fall a little further behind every night and you will spend the difference at public chargers.

Check price on Amazon

#ad · how this is funded

#2 · A Tesla at a J1772 station

Lectron J1772 to Tesla (NACS) Adapter

The opposite direction, and the one Tesla drivers actually need: it lets a NACS car take the J1772 cable that most workplaces and older buildings already have.

Published specifications for the Lectron J1772 to Tesla (NACS) Adapter, each linked to its source

Maximum current	Up to 80A at 240V ACsource
Direction	SAE J1772 charging station into a Tesla (NACS / J3400) vehicle portsource
Compatibility	Any Level 1 or Level 2 charger with a J1772 connector; Tesla Model S, 3, X and Y plus other NACS (J3400) vehiclessource
Ingress rating	IP67-rated for water and dustsource
Operating temperature	-22°F to 122°Fsource
Certification	UL 2252 certified, with built-in temperature monitoring and over-temperature protectionsource

What those numbers mean

Most public and workplace AC charging in the US is still J1772, and most Teslas ship without an adapter for it. This is the part that fills that gap, and it lives in the frunk.

IP67 is the strongest ingress rating of any adapter here — dust tight and rated for temporary immersion rather than just spray. That is the specification to want for something left connected outdoors overnight, though it is still worth keeping the coupling out of standing water.

80A is roughly double what any Level 2 AC station will hand you, so the adapter is never the limiting factor in the chain. The built-in temperature monitoring is the more meaningful feature: it is watching the connection you are not.

What it does well

• The direction Tesla drivers actually need for apartment and workplace J1772 cables
• IP67 rating and a published -22°F to 122°F operating range
• UL 2252 certified, with over-temperature protection built in

What it does not

• AC only — it does nothing at a CCS DC fast charger
• Small and valuable, which is exactly the theft profile of a shared parking garage

Skip this one if: Your car has a J1772 port. This adapter is for NACS-port vehicles and will not fit yours in either orientation.

Check price on Amazon

#ad · how this is funded

#3 · A J1772 car at a Tesla cable

Lectron Tesla (NACS) to J1772 Adapter, 48A

The adapter a J1772 car needs to use a Tesla wall, destination or mobile connector — which is the direction many apartment buildings have already installed.

Published specifications for the Lectron Tesla (NACS) to J1772 Adapter, 48A, each linked to its source

Rating	Up to 48A / 240V (11.5 kW)source
Direction	Tesla (NACS) charging source into a J1772 vehicle portsource
Compatibility	Tesla High Powered Wall Connectors, all generations of Destination Charger, and Mobile Connectorssource
Charging type	AC Level 1 and Level 2 only — not compatible with Superchargerssource
Certification	SGS certified to UL 2251source

What those numbers mean

Get the direction right before the brand. This adapter goes on a Tesla-shaped plug so a J1772 car can take it. If you drive a Tesla and the building's charger is J1772, you need the opposite adapter and this one will not physically fit.

The 48 amp rating is the adapter's ceiling. It does not raise anything: the slowest link in the chain — station, adapter, cable, car — sets the speed.

AC only, and that is a property of the adapter rather than a limitation to work around. Superchargers are DC and use an entirely different UL standard.

What it does well

• Rated to 48A, above what any Tesla AC source will deliver, so the adapter is never the bottleneck
• Certified to UL 2251, the standard written for charging couplers
• Turns a building's existing Tesla destination chargers into infrastructure your J1772 car can use

What it does not

• AC only, so it does nothing at a Supercharger
• Small enough to walk off from a shared parking structure

Skip this one if: You drive a Tesla. This is the wrong direction — you want a J1772-to-NACS adapter instead, and buying this one is the most common mistake in the category.

Check price on Amazon

#ad · how this is funded

It is workable — it is how a large share of urban EV owners live — and it is a different pattern rather than a broken one. The components:

1. 1Workplace charging, if it exists. Usually Level 2, often free or cheap, and a full working day at 7 kW is 50 kWh. This single item does most of the work for most people who have it. Check the connector — you may need an adapter.
2. 2One weekly DC session. 30-45 minutes covers a typical commuting week. Do it somewhere you would spend the time anyway.
3. 3Destination charging opportunistically. Slow, but free time is free time.
4. 4A Level 1 cable in the trunk. For any outlet you ever park near — a relative's, a friend's driveway, a rental. It costs little and it makes every socket usable.

Two things, and it is worth being clear about both before you commit to an EV without home access. Money: the per-mile difference from the formula above, multiplied by your annual mileage. Time: the fast-charging stops, which are real minutes even when they happen somewhere convenient.

• Road trips. Nothing else works and nothing else is trying to.
• Free workplace charging. Cheaper than home, and you were parked there anyway.
• Free destination charging on a trip you were making. Same reasoning.
• A genuinely inaccessible parking situation — street parking with a public sidewalk in between is the honest case where home charging is not available.

What it is not right for is routine daily charging that could have happened overnight from an outlet you did not go looking for. That is the expensive version of the same car.