diff --git a/basis.lua b/basis.lua
index 7f9ef00..893d413 100644
--- a/basis.lua
+++ b/basis.lua
@@ -21,9 +21,9 @@ local S = signs_bot.S
 local lib = signs_bot.lib
 
 signs_bot.MAX_CAPA = 600
-local PWR_NEEDED = 8
 
 local CYCLE_TIME = 1
+local CYCLE_TIME2 = 2  -- for charging phase
 
 local function in_range(val, min, max)
 	if val < min then return min end
@@ -233,14 +233,14 @@ function signs_bot.stop_robot(base_pos, mem)
 	if mem.signal_request ~= true then
 		mem.running = false
 		if minetest.global_exists("techage") then
-			minetest.get_node_timer(base_pos):start(4)
+			minetest.get_node_timer(base_pos):start(CYCLE_TIME2)
 			mem.charging = true
 			mem.power_available = false
 		else
 			minetest.get_node_timer(base_pos):stop()
 			mem.charging = false
 		end
-		if mem.power_available then
+		if mem.charging then
 			signs_bot.infotext(base_pos, S("charging"))
 		else
 			signs_bot.infotext(base_pos, S("stopped"))
@@ -387,19 +387,6 @@ if minetest.global_exists("techage") then
 	drop = ""
 end
 
-local function on_power(pos)
-	local mem = tubelib2.get_mem(pos)
-	mem.power_available = true
-	mem.charging = true
-	signs_bot.infotext(pos, S("charging"))
-end
-
-local function on_nopower(pos)
-	local mem = tubelib2.get_mem(pos)
-	mem.power_available = false
-	signs_bot.infotext(pos, S("no power"))
-end
-
 minetest.register_node("signs_bot:box", {
 	description = S("Signs Bot Box"),
 	stack_max = 1,
@@ -478,31 +465,6 @@ minetest.register_node("signs_bot:box", {
 	on_timer = node_timer,
 	on_rotate = screwdriver.disallow,
 	
-	-- techage power definition
-	tubelib2_on_update2 = function(pos, outdir, tlib2, node) 
-		if minetest.global_exists("techage") then
-			techage.power.update_network(pos, outdir, tlib2)
-		end
-	end,
-	networks = {
-		ele1 = {
-			sides = {L=1, U=1, D=1, F=1, B=1},
-			ntype = "con1",
-			on_power = function(pos)
-				local mem = tubelib2.get_mem(pos)
-				mem.power_available = true
-				signs_bot.infotext(pos, S("charging"))
-			end,
-			on_nopower = function(pos)
-				local mem = tubelib2.get_mem(pos)
-				mem.power_available = false
-				signs_bot.infotext(pos, S("no power"))
-			end,
-			nominal = PWR_NEEDED,
-		}
-	},
-	-- techage power definition
-
 	drop = drop,
 	paramtype2 = "facedir",
 	is_ground_content = false,
diff --git a/commands.lua b/commands.lua
index 6347273..542c790 100644
--- a/commands.lua
+++ b/commands.lua
@@ -156,6 +156,7 @@ end
 local function bot_error(base_pos, mem, err, cmd)
 	minetest.sound_play('signs_bot_error', {pos = base_pos})
 	minetest.sound_play('signs_bot_error', {pos = mem.robot_pos})
+	err = err or "unknown"
 	if cmd then
 		signs_bot.infotext(base_pos, err .. ":\n'" .. cmd .. "'")
 		mem.error = err .. ": '" .. cmd .. "'"
diff --git a/compost.lua b/compost.lua
index d4f5e18..0a50d6f 100644
--- a/compost.lua
+++ b/compost.lua
@@ -29,7 +29,7 @@ local function additem(mem, stack)
 	pos = {x = pos.x, y = pos.y - 1, z = pos.z}
 	node = minetest.get_node(pos)
 	ndef = minetest.registered_nodes[node.name]
-	if ndef.minecart_hopper_additem then
+	if ndef and ndef.minecart_hopper_additem then
 		return ndef.minecart_hopper_additem(pos, stack)
 	end
 	
@@ -47,7 +47,7 @@ local function takeitem(mem)
 	pos = {x = pos.x, y = pos.y - 1, z = pos.z}
 	node = minetest.get_node(pos)
 	ndef = minetest.registered_nodes[node.name]
-	if ndef.minecart_hopper_takeitem then
+	if ndef and ndef.minecart_hopper_takeitem then
 		return ndef.minecart_hopper_takeitem(pos, 1)
 	end
 end
diff --git a/init.lua b/init.lua
index 5db123f..98a8ea8 100644
--- a/init.lua
+++ b/init.lua
@@ -20,8 +20,8 @@ signs_bot.version = 1.08
 -- Test for MT 5.4 new string mode
 signs_bot.CLIP = minetest.features.use_texture_alpha_string_modes and "clip" or true
 
-if minetest.global_exists("techage") and techage.version < 0.25 then
-	error("[signs_bot] Signs Bot requires techage version 0.25 or newer!")
+if minetest.global_exists("techage") and techage.version < 1.0 then
+	error("[signs_bot] Signs Bot requires techage version 1.0 or newer!")
 end
 
 if tubelib2.version < 1.9 then
diff --git a/interpreter.lua b/interpreter.lua
index a0e859e..0d58f98 100644
--- a/interpreter.lua
+++ b/interpreter.lua
@@ -188,7 +188,7 @@ register_command("end", 0,
 register_command("call", 1,
 	function(base_pos, mem, addr)
 		if #mem.Stack > 99 then
-			return api.ERROR
+			return api.ERROR, "call stack overrun"
 		end
 		mem.Stack[#mem.Stack + 1] = mem.pc + 2
 		mem.pc = addr - 2
@@ -202,7 +202,7 @@ register_command("call", 1,
 register_command("return", 0,
 	function(base_pos, mem)
 		if #mem.Stack < 1 then
-			return api.ERROR
+			return api.ERROR, "no return address"
 		end
 		mem.pc = (mem.Stack[#mem.Stack] or 1) - 1
 		mem.Stack[#mem.Stack] = nil
diff --git a/techage.lua b/techage.lua
index 9283b45..e4e7def 100644
--- a/techage.lua
+++ b/techage.lua
@@ -8,19 +8,33 @@
 	GPLv3
 	See LICENSE.txt for more information
 	
-	Signs Bot: Bot Flap
+	Signs Bot: interface for techage
 
 ]]--
 
 -- Load support for I18n.
 local S = signs_bot.S
 
-local CYCLE_TIME = 4
+local MAX_CAPA = signs_bot.MAX_CAPA
+local PWR_NEEDED = 8
 
 if minetest.get_modpath("techage") then
 	
+	local function on_power(pos)
+		local mem = tubelib2.get_mem(pos)
+		mem.power_available = true
+		mem.charging = true
+		signs_bot.infotext(pos, S("charging"))
+	end
+
+	local function on_nopower(pos)
+		local mem = tubelib2.get_mem(pos)
+		mem.power_available = false
+		signs_bot.infotext(pos, S("no power"))
+	end
+
 	local Cable = techage.ElectricCable
-	local power = techage.power
+	local power = networks.power
 	
 	signs_bot.register_inventory({"techage:chest_ta2", "techage:chest_ta3", "techage:chest_ta4",
 			"techage:ta3_silo", "techage:ta4_silo", "techage:ta4_sensor_chest"}, {
@@ -164,26 +178,22 @@ send_cmnd 3465 pull*default:dirt*2]]),
     -- Bot in the box
 	function signs_bot.while_charging(pos, mem)
 		mem.capa = mem.capa or 0
-		if mem.power_available then
-			if mem.capa < signs_bot.MAX_CAPA then
-				local taken = power.consumer_alive(pos, Cable, CYCLE_TIME)
-				mem.capa = mem.capa + taken
-			else
-				power.consumer_stop(pos, Cable)
-				minetest.get_node_timer(pos):stop()
-				mem.charging = false
-				if not mem.running then
-					signs_bot.infotext(pos, S("fully charged"))
-				end
-				return false
-			end
+		
+		if mem.capa < signs_bot.MAX_CAPA then
+			local consumed = power.consume_power(pos, Cable, nil, PWR_NEEDED)
+			mem.capa = mem.capa + consumed
 		else
-			power.consumer_start(pos, Cable, CYCLE_TIME)
+			minetest.get_node_timer(pos):stop()
+			mem.charging = false
+			if not mem.running then
+				signs_bot.infotext(pos, S("fully charged"))
+			end
+			return false
 		end
 		return true
 	end
 	
-	Cable:add_secondary_node_names({"signs_bot:box"})
+	power.register_nodes({"signs_bot:box"}, Cable, "con")
 
 	techage.register_node({"signs_bot:box"}, {
 		on_inv_request = function(pos, in_dir, access_type)
@@ -266,9 +276,13 @@ send_cmnd 3465 pull*default:dirt*2]]),
 			return techage.put_items(inv, "main", stack)
 		end,
 	})	
-	
+
+	techage.register_node_for_v1_transition({"signs_bot:box"}, function(pos, node)
+		power.update_network(pos, nil, Cable)
+	end)
 else
 	function signs_bot.formspec_battery_capa(max_capa, current_capa)
 		return ""
 	end
-end
\ No newline at end of file
+end
+