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I ordered the VOX circuit this morning. The current plan is to just deal with charging. This seems to be the area where we are having most of the problems due to charging unattended and not being able to hear the balancer buzzers going off.
I am thinking that I will make an additional box that goes between the charger and the wall. Inside the box is the VOX circuit, arduino, a wall wart (for 12V power), and a solid state relay. There will be leads going to the inside of the phev box to the microphone. Since we aren't charging on the go, sound won't be an issue. When the balancers go off, it cuts power to the charger. Pretty simple. Once the charger is unplugged, the arduino powers down and it operates as normal.
I'll keep this thread updated as I build it.
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