The J1772 specs list GFCI as a required feature. OK... it's going to be a real pain in the butt for us old school EVers with non isolated chargers. and Iffy flooded battery packs. Having a CLEAN home built EV is a real step up in the required testing and gear. Heck having a solid chassis ground is getting clients to bite the bullet. The OEM customer is so clean that you can't measure ground current... I live in both worlds right now. The P3 with GFCI is going to require a isolated charger as the target. So...I have to bring my entire charger product line into sane compliance. The Racers and do it your selfers.. are becoming a rare breed. Enough to to live on but not enough to do any profitable volumes on. So.. lots to reinvent....I do have prototypes of what I need to make. They work, and are almost Beta ready. We will have a GFCI circuit up and running this week... and depending on the flow of orders and a closing market door, they will be on the Rev4 P3 main board by the end of the month. IF you have your P3 on a GFCI circuit no need for a additional one. If you insist, we can up grade, but the chances of a P3,s GFCI catching a OEM EV doing something wrong is about 1 on a Million.