You can use two 100' lengths.
You can do this too.
You only use one charger to charge a fence line. You can jumper together more than one net. I have three 164' nets jumpered together and powered with one 1.2 Joule output charger. I did purchase double the amount of support poles to reduce sag in the fence line.
I drove two 8' copper ground rods into the mucky area behind my pen and jumpered them together with lead out wire. I used lead out wire under the two gates as well.
