Ports
This file is located ModpackInstance\config\mm\ports\ 
This file is called solar_panel_energy_input.json
{
  "id": "solar_panel_energy_input",
  "name": {
    "text": "Battery Bank"
  },
  "port": "mm:energy",
  "input": true,
  "config": {
    "capacity": 20000000
  }
}