Scowbay wrote:This helps tremendously. Seems to me that one of the key decisions is whether to get something capable of 30+amps to take advantage of potential improved onboard charger in the future, or stick with something less than 20amps for current model. Does anyone see the potential of a charger upgrade that could take advantage of 30-40 amps 240v?
As smkettner said, I doubt there will be any upgrade available anytime soon. And for regular home charging it's really unnecessary anyway. There may be some hope in an adapter/charger that can accept a higher-rated J1772 plug for a power source and charge at a faster rate via the QC port, but that would be very costly and bulky at this point.
Also, to be clear on the "30-40 amps" question, the "conventional" wall units are all capable of charging at 32 amps, but require a circuit rated at 40 amps for 25% margin. Similarly, the upgraded Nissan or appropriately-set SPX charge at 16a and require a 20a circuit, and the stock or upgraded Nissan unit charges at 12a on a 15a (120v) circuit. Note 25% margin in each case.
Which route you take will probably be dictated by what you have available in your home. If you already have a 20a or 30a outlet available in your garage then it would be very cheap and easy to just get the EVSEupgrade for the Nissan unit and be done with it, but if you have to (or want to) run a new line anyway then you might as well make it a 40a line, since the additional cost of larger wire and breaker is peanuts compared to the cost of your electrician's labor. Of course, if a 40a line means you need to upgrade your panel, that's another story...
Personally, I had my Nissan unit upgraded and I plug it in with a simple adapter to an old-style 30a dryer outlet in my garage, which was unused as I have a gas dryer. I also ordered a second Nissan unit to carry in the car and had it upgraded as well. Although with the cheap wall units showing up on ebay recently I might have gone that route instead of getting the second Nissan unit. FYI, if you search for "nissan leaf charger" on ebay there are currently both an AV and a Blink unit up from reputable sellers with bids <$500.