src/main/resources/assets/mekanism/blockstates/chargepad.json

{
  "forge_marker": 1,
  "defaults": {
    "model": "mekanism:chargepad"
  },
  "variants": {
    "normal": [{}],
    "facing": {
      "north": {},
      "south": {"y": 180},
      "east":  {"y": 90},
      "west":  {"y": -90}
      },
    "inventory": [{}]
  }
}