These are the controls for adjusting the time the charger "floats" the battery pack after charging. This is to balance the sixteen batteries in the pack.
A vintage Omega chart recorder that I bought on eBay, several years ago. This is the first real application that I have used it in. Works great!
Here is the latest recording that I made after after an eighteen mile trip to Pullman and back. You can see that the charge time was 3.5 hours, followed by an approximate one hour very low power balance/float.
With the current cost of electricity here, the total trip cost would have been approximately TWENTY CENTS! I say: "Would have been," because our solar electric system is currently generating MORE power than it takes to recharge the car. We get free "gas" and what's left over, we sell back to the power company! What's better than that?
See -> http://rjrenergy.blogspot.com
(CLICK pictures for a larger image)