I was getting along fine running 3 group 31 lead acid and two dewalt for the LS. Then my bird 1197 died, I added a Garmin 12" at the console, then Rickie gave the 1197 cpr and it came back to life..... so now two at the console, Two Garmins and a HB up front, then all 3 of my 5 yr old group 31's died..... So, I replaced my 3 bank charger with a NOCO 3 bank adding a Noco 1 bank, with 2 12v 100 amp hour lithium for TM, (Ultrex) one 100 amp hr for electronics and a group 31 AGM for starter, live wells. Still sorting things out and networking 3 Garmins, 2 birds Put cut off switch on all 3 sources on the ground side of batteries. Pretty similar to what Rickie has done, weak minds copy what great minds figure out. Been too cold for this old guy so has not been on the water tested yet. Hopefully I did not screw it up. Love the input on this site.