I have been waiting for some cold weather here in Maine so that I can observe how much power the Volt is drawing from our Voltec charging station (240V level 2) to maintain the battery temperature at a safe level. I have live monitoring equipment for temperature and charging current in Watts installed and have put together this chart showing the last seven days of charging power vs. outside temperature. My charging station provides approximately 3700 Watts to the Volt during charging, and you can clearly see the charge cycles as extended periods at that wattage. But you will also see short spikes of around 2500 Watts. My data logger samples every 10 minutes, so the spikes are between 10 and 20 minutes long. I am pretty certain that these brief power draws relate to battery temperature management, and so far it is not a great deal of power. These readings were taken in late December 2012, and Maine will get a lot colder in January 2013 when our temperatures dip below zero Fahrenheit at night quite often. I may post updated charts showing how much charging power is drawn on those very cold nights. I thought that Volt owners might find this information interesting, and it clearly points out that in extreme temperature environments it is wise to leave the Volt plugged in.
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