Getting ready to replace my house batteries and trying to figure out just what I need.I currently have 4 8d gel batteries that are 14 years old and need replaced.none of my heat or air run through my inverter. 110 lights microwave and tv's is about it and my 12v lights and refrigerator. I'm not big into dry camping and if we do it's a couple of days and we're using generator for heat or a.c.and to run water heater. Thanks in advance for your input.