When I bought mine the sales rep discouraged me from getting dual chargers and I'm glad he did. 1 year later and 38,500 miles I have never had a situation at home where I would have needed faster charging than 10 kW. I never found a HPWC where I needed fast charging. And here is the thing, 20 kW is still pretty darn slow when you are on a road trip. There are way more CHAdeMo stations at 45 kW out there so the adapter was a much better deal.
I disagree. I have done many road trips. 20kW is pretty darn fast when it's available. I can tell you, my trip to Niagara Falls from Milwaukee, Wisconsin, would have turned out 100% different if I had the dual chargers at the time. As well as trying to get home... Would have been nice not needing to sit in Erie, PA for 7 hours just to get enough to make it to the Macedonia Supercharger from Niagara. The elevation changes and cold temps slaughtered my battery. Was even doing 45mph a good portion of that run and still didn't make it.
As for more CHAdeMO, not really. Maybe in California, but in the rest of the country, they are few and far between, and un-reliable. Here in Wisconsin, we have 5 total. I've been to all 5. 2 are only 20kW, one of them was offline. The other, while being 20kW, only charged my Model S at 11kW. V time A = W. Since the low voltage of my pack, allowed the station to hit it's Amperage Max before the stations kWh max output, 11kW was all I would get.
Station 3, damaged charge cable. Station should "Finally" be online again according to ABB (The station was at ABB's own facility!) end of this month. Time for ABB to repair ABB's own station you may ask? 4 MONTHS! Yep....
Station 4, Nissan branded. I killed that one a good dozen times now. at 0*F outside, I managed to overheat the station with both a MS60 and MS85 within 25 minutes of start of charging. Un-reliable.
Station 5, in Madison, WI, 2 blocks from the Supercharger, actually worked flawless. 50kW rated station, only put out 30kW. But, yes, it DID work. And did so from start to finish and stayed COOL the entire time.
So 1 out of 5 Stations performed reasonably.
AC based charging is much more "Reliable" in my opinion then CHAdeMO. CHAdeMO is awesome when it works, but requires owner maintenance of the stations. Such as Filter cleanings so they don't overheat. Where as, AC stations, are more or less "Set em and forget em". Plug it in and let er go. All they really do is tell the car what amperage circuit the cars on, and then flip on a simple contactor to allow power to flow to vehicle. And, of course, some a bit more complicated like the Charge Points.
