fixes to solar panel and battery boxes

not possible any longer to load many batboxes at the same time
solar panels now have energy buffers too, so 1st batbox will be loaded,
then the next one etc

solar_panel.lua

@@ -0,0 +1,74 @@
+minetest.register_node("technic:solar_panel", {
+	tiles = {"technic_solar_panel_top.png", "technic_solar_panel_side.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},
+	sounds = default.node_sound_wood_defaults(),
+    	description="Solar Panel",
+	active = false,
+	technic_power_machine=1,
+	internal_EU_buffer=0;
+	internal_EU_buffer_size=1000;
+	drawtype = "nodebox",
+	paramtype = "light",
+	is_ground_content = true,	
+	node_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+		},
+		selection_box = {
+			type = "fixed",
+			fixed = {-0.5, -0.5, -0.5, 0.5, 0, 0.5},
+		},
+	on_construct = function(pos)
+		local meta = minetest.env:get_meta(pos)
+		meta:set_float("technic_power_machine", 1)
+		meta:set_float("internal_EU_buffer", 0)
+		meta:set_float("internal_EU_buffer_size", 1000)
+
+		meta:set_string("infotext", "Solar Panel")
+		meta:set_float("active", false)
+	end,
+})
+
+minetest.register_craft({
+	output = 'technic:solar_panel 1',
+	recipe = {
+		{'default:sand', 'default:sand','default:sand'},
+		{'default:sand', 'moreores:copper_ingot','default:sand'},
+		{'default:sand', 'default:sand','default:sand'},
+
+	}
+})
+
+minetest.register_abm(
+	{nodenames = {"technic:solar_panel"},
+	interval = 1,
+	chance = 1,
+	action = function(pos, node, active_object_count, active_object_count_wider)
+		
+		local pos1={}
+		pos1.y=pos.y+1
+		pos1.x=pos.x
+		pos1.z=pos.z
+
+		local light = minetest.env:get_node_light(pos1, nil)
+		local meta = minetest.env:get_meta(pos)
+		if light == nil then light = 0 end
+		if light >= 12 then
+			meta:set_string("infotext", "Solar Panel is active ")
+			meta:set_float("active",1)
+			local internal_EU_buffer=meta:get_float("internal_EU_buffer")
+			local internal_EU_buffer_size=meta:get_float("internal_EU_buffer_size")
+			local charge_to_give=80
+			if internal_EU_buffer+charge_to_give>internal_EU_buffer_size then
+			charge_to_give=internal_EU_buffer_size-internal_EU_buffer
+			end
+			internal_EU_buffer=internal_EU_buffer+charge_to_give
+			meta:set_float("internal_EU_buffer",internal_EU_buffer)
+			
+		else
+			meta:set_string("infotext", "Solar Panel is inactive");
+			meta:set_float("active",0)
+		end
+	end,
+})