Re: 220VAC On-Board Chargers

[Paul G <neong@gte.net>]

>As has been discussed
>of late, a lot of chargers use the neutral to provide 120V for fans or
>other control circuitry.  Tom is trying to compile a list of chargers
>by make and model, with the intent of showing Avcon that there needs
>to be a neutral wire in the Avcon EV connector.  Not sure if he intends
>on trying to get it added to the J1772 spec or not, but Tom is working
>closely with Avcon and could probably pull off some sort of change.
>
>===>Mark
[snip]
>My K&W does not meet the requirement although I don't know about the new one
>that is coming out. The Lesters I'm familiar with don't meet the requirement
>either. "Bad boy" charging (just a diode and a resistor) will work but
>typically there will be large enough currents to ground due to the lack of
>isolation that the control box will open its contactor.
>
>SO, does anyone out there know of chargers that, like your average 220 volt
>hot-water heater, need only the two line wires to function?
>
>Tom Stockebrand  <stocky@swcp.com>

If you want isolation anyway it should be easy to provide a neutral in the
isolation transformer (center tap the thing). A small upgrade that one
should be able to do to an existing isolated 220vac charger, and an easy
change for a charger maker to do. In fact, it could be done to a
non-isolated 220vac charger too (with some weight penalty).

The EV charger standard allows for 20ma to trip (CDI-20 protection). I
charge using 120vac and GFCI, this only allows for a 5ma trip. I am not
having any problems with tripping and my charging system is non- isolated.
Sealed batteries help, but CDI-20 allows 4 times the leakage (and verifies
an earth ground connection to the EV so that is a safe level).

Neon