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Actually, it is possible to get above 100% with a heat pump, but you need to be careful about which definition of efficiency you use. As a thought experiment, put a heat pump in a closed, insulated box, but with an electrical connetion to the outside. If the heat pump draws 100 watts to do...

I have the opposite commute (Marina del Rey to Irvine), and the original poster has my condolences :( I would not rule out the 2015 Spark EV yet. The Chevy page for it just went live a few days ago, and they are claiming identical EPA range and city/highway efficiency numbers. All of...

Is there anything wrong with just replacing the front tires twice as often as the rear? Unless you have very uneven wear across the tread, is there even any real use to rotating left-to-right? I have never found any really convincing study that shows tire rotation helps in the long run...

I've dug around a bit, and it looks like combined AC/DC is at least assigned a type in the v2gtp. Here is a snip from the OpenV2G code (from http://sourceforge.net/p/openv2g/code/HEAD/tree/trunk/src/service/v2g_dataTypes.h#l92) enum EVSESupportedEnergyTransferType {...

OK, I see what you are trying to do. At smaller sizes, the 3.3 kW difference in rectifier capacity could be a significant cost. Although at some point, like going from 10 to 13 kW, it might not be worth the extra hassle. One potential block for using both AC and DC simultaneously is...

As far as I know, the J1772 connector can do 1-phase (120V to 240V) but not 3-phase. Also, I don't think the protocol allows AC and DC at the same time. There is an option that allows the pins used for AC to support L1 DC charging, but I haven't heard of any plans for cars or chargers to support...