So I ordered some AVR microcontroller kits from TuxGraphics.com and Adafruit.com and of course the odd parts from Mouser and Digikey. It was easy in Majuro, MH. They have a US Post Office and a state like abbreviation. Parts came in 7 days priority mail.
A programmable DVM looked just the ticket and TuxGraphics has a 3 digit meter that can easily be expanded to 6 analog inputs and sufficient code space to make it smart.
Planning ahead I also got a Data Logger shield for an Ardunio.
Of course my soldering is not this neat.
After only a few tests with misleading results and lots of other problems, I put the pieces on the shelf and have been monitoring the batteries with a simple voltmeter for the past year.
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