minetest.register_node(minetest.get_current_modname() .. ":solar", {
  description = "Solar Cell",
  tiles = {
    "solar_top.png",
    "solar_side.png"
  },
  drawtype = "nodebox",
  paramtype = "light",
  node_box = {
    type = "fixed",
    fixed = {
      {0.5, -0.1, 0.5, -0.5, -0.5, -0.5}
    }
  },
  groups = {
    sparktech_techy = 1,
    sparktech_energy_conductor = 2,
    sparktech_energy_max = 50
  }
})

minetest.register_abm({
	nodenames = {minetest.get_current_modname() .. ":solar"},
	interval = 1.0,
  chance = 1,
  catch_up = true,
	action = function(pos, node, active_object_count, active_object_count_wider)
    local meta = minetest.get_meta(pos)
    meta:set_int("energy", meta:get_int("energy") + 5)
    local emax = minetest.get_item_group(node.name, "sparktech_energy_max")
    if meta:get_int("energy") > emax then
      meta:set_int("energy", emax)
    end
	end
})