I don't know specifically how picky the e-Golf is about the waveform, but it is well known that some EVs will shutdown charging if they don't get a clean waveform. A clean waveform that is stable in voltage and frequency can only be produced with an inverter generator. So, I don't think the EB series Honda generator linked above is the best choice. The Honda EU series of inverter generators is known to work well with picky EVs.
