EVDRIVER wrote: jjeff wrote:
erco wrote:Are you sure you want to? 99% of 120V outlets are connected to 15A circuit breakers through wiring rated for 15A. 12A is a very reasonable maximum for that common situation. 15A rating is a maximum, not a suggested goal. An EVSE pulling 16A will trip circuit breakers and/or possibly overheat old wiring and outlets. Is that wise or desirable? Seems like leaving it at 12A is the smarter and more versatile play, if recharging "anywhere" is the goal. There's a reason why the upgrader makes you sign a release form for the 120V/16A mod.
While that may be true in very old homes, most modern homes use 20a breakers and wiring. Also basically all commercial outlets are on 20a circuits. Oh and I believe your 99% is off, AFAIK all homes have been required to have 20a outlets in the kitchen area for many years, I know my home(vintage '74 with at one time AU wire
) had many 15a circuits but did have 2 20a circuits in the kitchen
You may be surprised. Most commercial outlets are on 20A breakers but can often be shared and are generally worn out and in poor shape for EV charging. There are also many times 20A outlets that are used on 15a circuits, shared and unshared. Many modern homes also have cheap outlets that are not good for EV charging. I can't tell you how many 20A circuits I see in commercial applications that are unfit for EV charging. Not to mention the many circuits with loose wiring, bad grounds and hidden outlets on the same circuit that are shared. Assuming any 20A outlet is suitable is really a bad call in general unless it's one you had installed professionally at home. Even 12A charging is suspect on many unknown outlets, in the last 15 years I have encountered far more suspect and bad outlets than good ones. Public and commercial outlets are usually high duty and rarely checked.
That we agree
I also wouldn't really charge at more than 12a unless I knew the outlet and circuit was rated for more or I had used it in the past without issues. Even at 12a for an outlet I'd never used I'd probably unplug it(of course first the j1772 cable) after 5 or so minutes of charging and feel the prongs for any source of heat. If everything was cool I'd continue charging, if not I'd either dial it down on my EVSE or look for another outlet. Of course there could be heat other places like any splices upstream or even the breaker but I'd probably not have access to check those areas.
I regularly charge at 18a @ 120v at work for several hours at a time, the only thing that gets warm is the breaker itself but not hot and it's never tripped. The outlet is a quality(hospital grade) 20a outlet and all wiring is 12 gauge, oh and it's a dedicated outlet, that I do know.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a