davidh wrote:Are they just putting a new plug on it? Plug and throwing a switch? What modification needs to be made? Can I DIY it? The specs don't look that hard.
There are quite a few changes that must be made to ensure the unit will safely operate on 240V. In addition, you would need to spend many hundreds of hours reverse-engineering the unit and developing new firmware from the ground-up to get anything other than a 12 amp pilot out of the unit. (We have, and it's not easy!)
Once upgraded, the EVSE is then capable of 4 times the power output, and there simply is no way to do this without writing lots of new software, no matter how many components you attempt to change.
There have been a few people that have spent the time to gut the 1st generation EVSE's (2011-2012) and install an open EVSE board inside, but this is a waste of money, when you can sell the intact unit for way more than an open EVSE will cost you to build from scratch. It would be even worse money-wise, and also extremely difficult to do this on a 2nd generation (2013) EVSE, as the PCB is potted into the bottom housing (difficult to gut) and the size of the housing doesn't leave much room to work with.
If you must DIY; Sell your unit, take the $ and build your own open EVSE. You'll have more fun, and save a lot of hassle and a wad of money!