indyflick wrote:Since we now have a thread dedicated to discussing EVSE hacks, I'll repost this suggestion I posted in another thread. So I wonder if a virtual Level 1/2 EVSE could be created using two standard 3-prong 120v connectors. If two 120v connections are present on different circuits, the EVSE would "bond" them together as a quick and dirty portable Level 2 charger. If not, then it operates as a standard Level 1 EVSE. There could be an indicator on the unit, so that the user would know they are actually connected to two separate 110v circuits back to the panel, and what the aggregate voltage and amperage through the EVSE is. The application would be for EV owner who finds a Level 1 charger acceptable most of the time, however on occasion they have put on a lot of miles and need it topped off by morning.
I realize an extension cord may also be necessary for this to work, but I see videos of Nissan techs using extension cords on Level 1 EVSEs all the time.
garygid wrote:As soon as you get one, you may send it to me to investigate its guts.
An EVSE can certainly be made that will do 120/240 volt operation (see SPX 32A),
and 240v-from-two-120v is easiest done with a two-socket adapter, and CAUTION.
The two 120v sockets near my clothes washer are on different legs
(one on L1, the other on L2, both on Neutral) of the house supply.
Easy to check with CAREFUL use of a small AC voltmeter.
From scratch or will you be modding an existing EVSE?EVDRIVER wrote:Not a big issue as long as no GFI circuits are being used. I will be making one when I get my car.
garygid wrote:Regular GFI vs EV GFI:
GFI is often (usually) not looking fo some (small) current flowing in the Ground wire, but an imbalance of current flowing in the two "power" wires.
1. Regular: a small difference of something like 5 to 10 milli-amps (0.005 to 0.010 amps) triggers the cut off.
2. EV GFI: In testing EVSEs, it was found that the Regular (small) current imbalance was too often triggered, in normal operation. So, the GFI in EVSEs is usually set higher, up to around 20 milli-amps, to eliminate the many false alarms.
This comes from a discussion of implementation practices in the J1772-2010 standards document, and a section in NEC635 that permits the higher GFI detection level ... as I recall.
Because of this, apparently many (some) EVSEs will NOT work well if plugged into a GFI wall circuit (GFI in the socket, or in the breaker). Thus, the use of EVSEs may suggest that a NON-GFI circuit should be used.
Yep, some seem to "suggest" using a GFI socket/circuit.
Yes, confusing and contradictory, I know.
indyflick wrote:From scratch or will you be modding an existing EVSE?EVDRIVER wrote:Not a big issue as long as no GFI circuits are being used. I will be making one when I get my car.