My fuse blew, and I asked if the engineers knew why. I just got an email back from them referring me to this page, which is probably brand new Temporary Charging Limitation | Tesla Motors TEMPORARY CHARGING LIMITATION Recommended Maximum Power (60A, 15kW) Thank you for purchasing a High Power Wall Connector and twin-chargers for your Model S. This combination enables the fastest home charging possible. However, we recently found an issue with our High Power Wall Connector that causes us to recommend you limit charging to 60A or lower to prevent nuisance fuse trips. We know this partially defeats our efforts and yours to enable very fast charging, especially those of you who invested in a full 80A-capable home installation. We are very passionate about charging fast and enabling a great experience, so please accept our apologies for this problem. We are working as fast as possible to repair this and enable the full 80A charging you were promised using a Tesla High Power Wall Connector. Is it safe? Yes. This issue is does not compromise the unit's safety in any way. Why is it limited? The internal fuses in the Wall Connector are too sensitive to small disturbances on the utility voltage. These fuses may falsely trip when nothing has gone wrong with the connector or vehicle, much like a household outlet that trips while using a hair dryer. Should a fuse trip, the unit will shut off and the car will not complete its charge. As a result, we're recommending you limit charging from a Wall Connector to 60A to ensure that your charge completes as planned. The vehicle itself is still capable of charging at 80A without any problems and you can do this at any other high-powered infrastructure (including all Superchargers) without any concerns. This issue is limited to High Power Wall Connectors operating at over 60A of current. When will it be fixed? By or before June 2013, at no cost. We will work with you and/or your wall-connector installer to upgrade your wall connector as quickly as possible. Again, we apologize for the inconvenience and are working as fast as we can to get your wall connector back to all that the original specification promised.