I tested the 3 battery setup last night with two motors. On the generator side with the motors connected by a #25 chain I can get about 9.50 Volts output.

The meter on the left is the output from the generator the one on the right is from battery 3.
I also added a PWM to the system to see what would happen when I adjusted the motor.

It worked the way I thought it would and allowed me to adjust the speed of the motor until I found the sweet spot that battery 3 was getting the best charge while battery 1 and 2 had less draw.
That definitely tells me that the load is very important to get right.
My last test was putting a load on the generating motor.

Thats a 20watt 12v lamp in the picture. It was not running at full brightness but it was running well from the 9.5 volts. The interesting thing is when I added that load to the generator the charging almost stopped to battery 3.
-Altrez
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