many worldgen mods and gonna try technic now

mods/technic_plus/technic/machines/LV/solar_panel.lua

@@ -0,0 +1,72 @@
+-- Solar panels are the building blocks of LV solar arrays
+-- They can however also be used separately but with reduced efficiency due to the missing transformer.
+-- Individual panels are less efficient than when the panels are combined into full arrays.
+
+local S = technic.getter
+
+
+minetest.register_craft({
+	output = 'technic:solar_panel',
+	recipe = {
+		{'technic:doped_silicon_wafer', 'technic:doped_silicon_wafer', 'technic:doped_silicon_wafer'},
+		{'basic_materials:silver_wire',    'technic:lv_cable',            'mesecons_materials:glue'},
+	},
+	replacements = { {"basic_materials:silver_wire", "basic_materials:empty_spool"}, },
+})
+
+
+local run = function(pos, node)
+	-- The action here is to make the solar panel prodice power
+	-- Power is dependent on the light level and the height above ground
+	-- There are many ways to cheat by using other light sources like lamps.
+	-- As there is no way to determine if light is sunlight that is just a shame.
+	-- To take care of some of it solar panels do not work outside daylight hours or if
+	-- built below 0m
+	local pos1 = {x=pos.x, y=pos.y+1, z=pos.z}
+	local machine_name = S("Small Solar %s Generator"):format("LV")
+
+	local light = minetest.get_node_light(pos1, nil)
+	local time_of_day = minetest.get_timeofday()
+	local meta = minetest.get_meta(pos)
+	if light == nil then light = 0 end
+	-- turn on panel only during day time and if sufficient light
+        -- I know this is counter intuitive when cheating by using other light sources underground.
+	if light >= 12 and time_of_day >= 0.24 and time_of_day <= 0.76 and pos.y > -10 then
+		local charge_to_give = math.floor((light + pos1.y) * 3)
+		charge_to_give = math.max(charge_to_give, 0)
+		charge_to_give = math.min(charge_to_give, 200)
+		meta:set_string("infotext", S("@1 Active (@2)", machine_name,
+			technic.EU_string(charge_to_give)))
+		meta:set_int("LV_EU_supply", charge_to_give)
+	else
+		meta:set_string("infotext", S("%s Idle"):format(machine_name))
+		meta:set_int("LV_EU_supply", 0)
+	end
+end
+
+minetest.register_node("technic:solar_panel", {
+	tiles = {"technic_solar_panel_top.png",  "technic_solar_panel_bottom.png", "technic_solar_panel_side.png",
+	         "technic_solar_panel_side.png", "technic_solar_panel_side.png",   "technic_solar_panel_side.png"},
+	groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2,
+		technic_machine=1, technic_lv=1},
+	connect_sides = {"bottom"},
+	sounds = default.node_sound_wood_defaults(),
+	description = S("Small Solar %s Generator"):format("LV"),
+	active = false,
+	drawtype = "nodebox",
+	paramtype = "light",
+	is_ground_content = true,
+	node_box = {
+		type = "fixed",
+		fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+	},
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_int("LV_EU_supply", 0)
+		meta:set_string("infotext", S("Small Solar %s Generator"):format("LV"))
+	end,
+	technic_run = run,
+})
+
+technic.register_machine("LV", "technic:solar_panel", technic.producer)
+