The point is there isn’t access to a 240 Volt outlet, only an existing 120 Volt 30 Amp TT-30 outlet. Without the transformer, the Bolt can only charge at 120 Volts at 12 Amps, 1440 Watts even though the TT-30 outlet is actually capable of delivering 2880 Watts. By stepping up to 240 Volts with the transformer the charge rate can be doubled. This does kind of come under the category of an interesting solution in search of a problem. I suppose if one had routine access to a TT-30 outlet and no chance of upgrading it to 240 Volts, then this might be helpful. I do find it an interesting project. I suppose it one routinely car camped in older campgrounds with only TT-30 outlets it could be handy.What is the point of this? The OEM charger will run on 240 and all you need is a converter for the plug and a 240 outlet.