My hat is off to you for surviving to 81. I'm 75 and the LiFePO4 batteries will be the death of me yet. Browneye is spot on about the learning curve. I started with Battleborn and then went with the DIY on LiFePO4. I still haven't got a clue how to put 16 cells together that won't spark. Maybe tomorrow.Hey I am a 81 year old retired HVAC tech and instructor at a technical school along with basic electrical I am familiar with diagrams and schematics my problem would you answer some questions from time to time