Is this thread dead? I was looking around for a method to do this as well.
I have found a device that can monitor temp, and external temp, voltage on 3 different inputs (eg solar panel, battery, etc) it also has a load sensor, I don't recall how much of a load it will handle. The odd ball thing is that the device needs 3 - 6 volts to work, but can monitor voltages higher then that. The best part is that it has a serial interface that ti sends the data to. Now, it seems all good, but I have no clue on scripting, but I'm sure the device will work for what seems to be wanted. It is small enough to fit in an anttenna enclosure with a RB.
In search of the serial device I also came across a device that had a RJ45 connector, and a small processor on it, wit several analog, and digital inputs and outputs. They were mentioning that it could be programmed with basic, as well as otehr programming laguages, since it had ram on it, and an eeprom, assuming it runs a scrip on it as well, and could monitor or do whatever you want with ethernet connectivity. This device was about 1 inch wide, 2 inches long, and 1 inch tall. very small!
But to my original question, is this idea dead? or is there a use for this voltage monitoring?