solarpanel.java:

package com.wezulaweciarz.basinica.blocks;

import net.minecraft.block.Block;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;

public class SolarPanel extends Block {
    public SolarPanel() {
        super(Properties.create(Material.IRON)
                .sound(SoundType.METAL)
                .hardnessAndResistance(2.0f)
                .lightValue(14)
        );
        setRegistryName("solarpanel");
    }
}

blockstate:

{
  "variants": {
    "": { "model": "basinica:block/solarpanel"}
  }
}


model:

{
    "credit": "Basinica Solar Panel",
    "textures": {
        "3": "basinica:block/solar_panel",
        "4": "basinica:block/solar_gray",
        "5": "basinica:block/solar_connector"
    },
    "elements": [
        {
            "name": "holder",
            "from": [4, 0, 4],
            "to": [12, 1, 12],
            "faces": {
                "north": {"uv": [0, 0, 8, 1], "texture": "#4"},
                "east": {"uv": [0, 0, 8, 1], "texture": "#4"},
                "south": {"uv": [0, 0, 8, 1], "texture": "#4"},
                "west": {"uv": [0, 0, 8, 1], "texture": "#4"},
                "up": {"uv": [0, 0, 8, 1], "texture": "#4"},
                "down": {"uv": [0, 0, 8, 1], "texture": "#4"}
            }
        },
        {
            "name": "support",
            "from": [7, 1, 7],
            "to": [9, 6, 9],
            "faces": {
                "north": {"uv": [0, 0, 16, 16], "texture": "#5"},
                "east": {"uv": [0, 0, 16, 16], "texture": "#5"},
                "south": {"uv": [0, 0, 16, 16], "texture": "#5"},
                "west": {"uv": [0, 0, 16, 16], "texture": "#5"},
                "up": {"uv": [0, 0, 16, 16], "texture": "#5"},
                "down": {"uv": [0, 0, 16, 16], "texture": "#5"}
            }
        },
        {
            "name": "panel",
            "from": [0, 6, 0],
            "to": [16, 7, 16],
            "faces": {
                "north": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "east": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "south": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "west": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "up": {"uv": [0, 0, 16, 16], "texture": "#3"},
                "down": {"uv": [0, 0, 16, 16], "texture": "#4"}
            }
        },
        {
            "name": "holder connector",
            "from": [6, 1, 6],
            "to": [10, 2, 10],
            "faces": {
                "north": {"uv": [0, 0, 4, 1], "texture": "#4"},
                "east": {"uv": [0, 0, 4, 1], "texture": "#4"},
                "south": {"uv": [0, 0, 4, 1], "texture": "#4"},
                "west": {"uv": [0, 0, 4, 1], "texture": "#4"},
                "up": {"uv": [0, 0, 4, 1], "texture": "#4"},
                "down": {"uv": [0, 0, 4, 1], "texture": "#4"}
            }
        },
        {
            "name": "panel connector",
            "from": [6, 5, 6],
            "to": [10, 6, 10],
            "faces": {
                "north": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "east": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "south": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "west": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "up": {"uv": [0, 0, 16, 16], "texture": "#4"},
                "down": {"uv": [0, 0, 16, 16], "texture": "#4"}
            }
        }
    ],
    "display": {
        "thirdperson_righthand": {
            "rotation": [75, 315, 0],
            "translation": [0, 2.5, 0],
            "scale": [0.375, 0.375, 0.375]
        },
        "firstperson_righthand": {
            "rotation": [0, 315, 0],
            "translation": [0, 2.5, 0],
            "scale": [0.4, 0.4, 0.4]
        },
        "ground": {
            "translation": [0, 3, 0],
            "scale": [0.25, 0.25, 0.25]
        },
        "gui": {
            "rotation": [30, 45, 0],
            "scale": [0.625, 0.625, 0.625]
        },
        "head": {
            "rotation": [0, 180, 0]
        },
        "fixed": {
            "rotation": [0, 180, 0]
        }
    }
}