Injunjer

I used Renogy Solar Y Branch Connectors MMF+FFM Pair $12.99 to split the solar panel wires on one 100w panel.

Nobody could answer this question, so... I wired it, tested it, and have been doing this for 3 years now. Works flawlessly. Actually, you could feed one panel or array to as many charge controllers as you like. Each charge controller will accept as much or little energy as available. As each battery becomes full, other charge controllers have more energy available.

One solar panel, one 14awg solar wire with split to two charge controllers. Each charge controller supports one battery bank, one bank for parked rv and a separate bank for shed lights and power. Works perfect, each charge controller accepts any energy available just like when the sun is full or partial always changing. One 30 and one 40amp charge controller, one 100w panel.