120v 15a outlets have two vertical flat blades. In contrast, 120v 20a
outlets turn one of those blades horizontal. You can see this in the 120v
20a outlets as they usually are built to accept both 15a and 20a plugs.

A device that has a 15a type plug (NEMA 5-15) should only draw 12a on a
continuous basis (per 80% rule for continuous loads).

This EVSE comes with a built-in 240v 20 amp plug (NEMA 6-20) that is
designed for a continuous 16 amps on 240v circuit. This might be able to
pass UL.

They also include an adapter to convert the 6-20 plug to a 5-15 plug. I
doubt this adapter would pass UL, as it could allow generic 240v equipment
to be plugged into 120v sources. Also it doesn't appear to have a way to
tell the EVSE to reduce the max current signal value to 12. However...it is
possible the EVSE is programmed to always signal 12a whenever it sees 120v.
IIRC the dual voltage capable (after mods) OEM EVSE that came with the
earlier Nissan Leaf years had this behavior (12a on 120v, 16a on 240v).

In contrast, Tesla's portable EVSEs handle the dual voltage and different
outlet amperage ratings cases by using proprietary adapters. These tell the
EVSE what kind of outlet it is being used with.

On Wed, May 29, 2019, 18:03 Alan Brinkman via EV <ev@lists.evdl.org> wrote:

> Bob,
> The EVSE you are looking at lists: Rated current & voltage: 120v-220v /
> 16A. I would assume that it will signal the electric vehicle it plugs into
> that it can supply a maximum of 16 Amps at 120v when plugged into 120v and
> 240v when plugged into 240v.
> However, a simple description of an EVSE says: Using two-way communication
> between the charger and car, the correct charging current is set based on
> the maximum current the charger can provide as well as the maximum current
> the car can receive.
> Maybe it is just the current that is communicated, and the car's charger
> accepts 120 to 220 volts, and keeps the current used at 16 Amps or below,
> assuming the vehicle being charged can accept 16 Amps.
> Someone more knowledgeable please chime in now...................
> I bought a used EVSE to handle 30 Amps at 220v, but it is a large, heavy
> cabinet, and I am second guessing the purchase. It is still sitting,
> waiting for me to attach it to a pole. I have most of the wiring ready. My
> 120v 16A charger is working fine for a daily use of 15 to 30 miles. 220v at
> 16A would be a better next step for me.
> Alan
> -----Original Message-----
> ^From: EV <ev-boun...@lists.evdl.org> On Behalf Of Robert Bruninga via EV
> ^Sent: Wednesday, May 29, 2019 1:40 PM
> ^To: Electric Vehicle Discussion List <ev@lists.evdl.org>
> ^Cc: Robert Bruninga <bruni...@usna.edu>; ev...@yahoogroups.com
> ^Subject: [EVDL] Dual voltage EVSE?^
> ^Amazon has this dual voltage EVSE ($189) that includes the adapter to 240
> V 20 amp plug.
> https://www.amazon.com/BougeRV-Portable-Electric-Charging-Compatible/dp/B07BM1XT4Q/ref=sr_1_1?keywords=dual+voltage+evse&qid=1559162151&s=gateway&sr=8-1
> ^Does anyone know if these things signal 12 amps at both voltages (it
> doesn't know what it is plugged into, though it could easily sense the
> voltage and switch).
> ^Or does it do 16 amps at either voltage.  This would not be good for
> 15amp general purpose use.
> ^Inquiring minds... etc
> ^Bob, Wb4APR
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