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Originally Posted by oil pan 4
That's not going to happen. The OEMs don't even have a standardized voltage with in their own company.
The only thing standardized is the input voltage to the charger. Usually its single phase 220. I am sure 3-phase 220v chargers exist or can be built for most battery systems.
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From the plug (and voltage) side, SAE has a J1772 standard (see
SAE J1772 - Wikipedia, the free encyclopedia for an overview) which is being adopted by EV manufacturers and charging station manufacturers alike. Generally, it is a standardized connector that would be able to support several different standard voltages (currently it supports 120V and 240V AC single phase, and they are looking to add DC charging as well, potentially as high as 600V DC @ 400A). The EV would be able to detect what the supply side offers and use the optimum method for charging.
Unfortunately, most charging connectors are on the side of the EV, similar to the fuel fillup location of a modern ICE. Connecting a genset trailer would make it look like you're driving something out of Loopers. That would detract from the "occasional use via rental" aspect unless the auto manufacturers started to put the charging connector on the back (like some of the older US cars with the filler behind the license plate). Of course, if you're one of those DIYers and plan to be using a genset trailer on a regular basis, you could probably relocate the connector... but then you wouldn't care as much if it was standardized or not.
In answer to an earlier comment (raised by
redpoint5), I see that one of the features of the J1772 connector is:
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The signaling protocol has been designed so that ... vehicle detects plug via proximity circuit (thus the vehicle can prevent driving away while connected)
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That's certainly a likely problem that the commercial EV manufacturers would want to avoid, so I would expect that having the genset plugged in and trying to drive would not be possible without some DIY tinkering.