hi,i dont know if that will help.so,for example if i have 2 12v 100A/H battery and i connect them in series,the voltage will combine and give 24v and the amps will remain the same,100A/H, in terms of watts,I x V =2400W
now lets take the same battery and connect them in parallel,so,the voltage will remain the same,12v whereas the amps will double,200A/H and the power will be, IxV=2400W
you can see that the power in both configuration remain the same.the only difference in 12v and 24v setup is that there is less power loss in a 24v setup than in a 12v setup.