So are you saying it's NOT safe to connect 24v panels to charge a 12v battery bank even if you have an MPPT controller (whatever that is...)? I took away that it was OK to use 24v panels to charge 12v batteries as long as you had the right charge controller in the circuit to manage the process. Is that not correct?
Although I can't say I agree with greenrvgreen's attitude in this thread, he makes a good point that BS should be called in the original thread to help guys like me separate fact from fiction.