adding #2 new weize minis to #2 9mos old weize minis

[mark frey]

I'm planning an upgrade to my solar system, 3k all in one sungold 24v inverter, #4 200 watt panels, 2 weize mini 12.8v lifpo batteries. What's the best battery configuration considering the age difference of the batteries. The old batteries have very little use though they often trip battery open faults when running a propane dryer on motor start up.