I bought the Elcon PFC 3000 charger for my truck. This is a 3kW charger that can handle 120 or 240VAC input. I thought this would be handy and I would be able to normally charge using 240 at my house, but opportunity charge at 120 when there is a normal 5-15 plug available.
Since I have been using the charger a little now (we have been doing some short test drives and then charging) I am starting to get a feel for how it works. When I use it at 240, it charges the pack at 16.7A which is a little 0ver 0.1C. At this rate it would charge a completely empty pack in a little under 10 hours. However that situation should never occur since I plan on maximum depth of discharge of no more than 80%. So my normal charge time from "empty" should be less that 8 hours.
But anyway, that is not my point. The point is, when I charge at 120, it is charging my pack at about 15.1A, a little less. I measured the wall current in this case and it is just under 20A. That is too much for a normal 5-15 plug. The few circuits that I have checked (at my house and some others) seem to typically have a 20A breaker for the 15A circuit. So I have been able to actually charge from this kind of circuit, pulling almost 20A from the wall, and not trip the breaker. But that doesn't seem right. I am concerned that I will try this at a friend's house, or a plug I find in a parking lot, and end up tripping a breaker.
So, my message to you is this. If you are planning to use an Elcon 3kW charger like I was, be aware that it is going to pull too much current at 120 to be useful for opportunity charging at 120VAC. Instead you might consider the 2.5kW charger.
Other than this, I like this charger.