BFL-13- My system is not MPPT. I hooked it up according to the instructions (I thought, anyway) and it was my understanding that the controller takes care of the voltage difference between the power source and the battery. Am I wrong to make that assumption? Feel free to let me know if I'm doing something stupid, I have a pretty thick skin! The solar system always worked well, at least until the connector failed. My main concern now is with the WFCO controller that came with our camper. It seems that the voltages that it produces are not suitable for the T-1275 battery. And the manual has no mention of a way to adjust the voltages. So, what's next?