Due to a output calibration issue I have new taken my first classic charge controller offline. I have swapped it out with my new classic that was purchased for the additional PV.
The problem with the old classic has been there from the beginning. I performs fine 100% reliable but its output readings have been off from the get go. Around 25% optimistic. I picked up on this in the first week but against my better judgement assumed it was my gear that was out. Anyhow I now have conclusive results to show its out of whack. Midnite gave me instructions on how to tweak the tiny gain pot but unfortunately it looks like the gain pot is not even functioning. They were very good about the issue and said give it back to us and we will sort it out. I'm not to worried about having a issue. Its how the company's handle it that speaks volumes to me.
So this discovery puts a few things into perspective. The first is that my lead acid battery's are a good 25% more efficient that the numbers I was recording

. The bad news is my PV is 25% less efficient than I was recording

Though some of the output numbers I was getting were just silly way over the rated output of the system. T
he new classic is spot on with its calibration, matches the selectronic shunt, My clamp meter and the midnite wizbang shunt , they all agree. Good to have some reliable data to work with now.
So now I need to reevaluate my system all over again. It will be interesting to see how many KWH is needed to cover a days DC kwh consumption. What the idle/float output is with just base loads and so on.
kurt