6 panels 7a ea. 26v 48 volt bat bank 3 on 1 24v 3 on other

i would not recommend doing that;  it may not work out so well. with two es190 in series, and three  pairs in parallel, you have 36v nominal feeding a 48v system.  you are probably getting poor performacnce, and it will be worse in summer as heat drives down your voltage.

i would not recommend doing that to the battery bank.  you are asking for problems by creating the possibility for unequal resistances in your bank where your batteries are going to self discharge to each other.

if i had your system, I would run two strings of three modules in series and run them to an appropriate mppt controller such as an mx60, xw mppt 60, flexmax 80.  they would be able to down convert from the 54v nominal you are bringing in to the 48v nominal of your battery bank.

cheers,

james
Alt-E staff