Your batteries are at notably different states of charge.
Short term, I would break them down and pair the 14.60 and 15.19 together for 24V and then pair the 13.32 with the 13.69.
I personally use these on my 48V bank consisting of 4S2P Trojan 12V:
You would need 4. Connect one to each battery and then connect them to each other. They sense when batteries are different voltages, and they transfers charge from the higher voltage batteries to the lower voltage batteries.
Note that running your batteries at anything over 14.6-14.8V (depends on the battery's specifications) will damage them.
If these are flooded batteries, you need to make sure the electrolyte is at the proper level by filling with distilled water. Make sure the tops of the batteries are very clean before you open them.
Short term, I would break them down and pair the 14.60 and 15.19 together for 24V and then pair the 13.32 with the 13.69.
I personally use these on my 48V bank consisting of 4S2P Trojan 12V:
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You would need 4. Connect one to each battery and then connect them to each other. They sense when batteries are different voltages, and they transfers charge from the higher voltage batteries to the lower voltage batteries.
Note that running your batteries at anything over 14.6-14.8V (depends on the battery's specifications) will damage them.
If these are flooded batteries, you need to make sure the electrolyte is at the proper level by filling with distilled water. Make sure the tops of the batteries are very clean before you open them.