diff --git a/energy_storage/heatexchanger2.lua b/energy_storage/heatexchanger2.lua
index 22e70ba..b551fc2 100644
--- a/energy_storage/heatexchanger2.lua
+++ b/energy_storage/heatexchanger2.lua
@@ -117,10 +117,8 @@ local function after_place_node(pos, placer)
 		return true
 	end
 	local nvm = techage.get_nvm(pos)
-	local own_num = techage.add_node(pos, "techage:heatexchanger2")
-	State:node_init(pos, nvm, own_num)
+	State:node_init(pos, nvm, "")
 	M(pos):set_string("formspec", formspec(State, pos, nvm))
-	M(pos):set_string("infotext", S("TA4 Heat Exchanger").." "..own_num)
 end
 	
 local function on_receive_fields(pos, formname, fields, player)
diff --git a/init.lua b/init.lua
index 857172b..98f60bf 100644
--- a/init.lua
+++ b/init.lua
@@ -186,7 +186,7 @@ else
 	-- Test
 	dofile(MP.."/recipe_checker.lua")
 	dofile(MP.."/.test/sink.lua")
-	dofile(MP.."/.test/meta_node.lua")
+	--dofile(MP.."/.test/meta_node.lua")
 	
 	-- Solar
 	dofile(MP.."/solar/minicell.lua")
diff --git a/power/schedule.lua b/power/schedule.lua
index 03c3982..a7832cf 100644
--- a/power/schedule.lua
+++ b/power/schedule.lua
@@ -17,6 +17,7 @@ local P2P = minetest.string_to_pos
 local P2S = function(pos) if pos then return minetest.pos_to_string(pos) end end
 local M = minetest.get_meta
 local N = function(pos) return minetest.get_node(pos).name end
+local HEX = function(val) return string.format("%XH", val) end
 
 local power = techage.power
 local networks = techage.networks
diff --git a/solar/minicell.lua b/solar/minicell.lua
index a4b72f5..795ba9e 100644
--- a/solar/minicell.lua
+++ b/solar/minicell.lua
@@ -19,12 +19,7 @@ local S = techage.S
 
 local CYCLE_TIME = 2
 local PWR_PERF = 1
-local PWR_CAPA = 30 * 20 -- default day
-
-minetest.after(2, function()
-	-- calculate the capacity depending on the day duration
-	PWR_CAPA = math.max(minetest.get_gametime() / minetest.get_day_count() / 2, PWR_CAPA)
-end)
+local PWR_CAPA = 2400 -- ticks (2s) with 1 ku ==> 80 min = 4 game days
 
 local Cable = techage.ElectricCable
 local power = techage.power
@@ -34,15 +29,18 @@ local function node_timer(pos, elapsed)
 	nvm.capa = nvm.capa or 0
 	pos.y = pos.y + 1
 	local light = minetest.get_node_light(pos) or 0
+	local t = minetest.get_timeofday()
 	pos.y = pos.y - 1
 	
-	if light >= (minetest.LIGHT_MAX - 1) then
+	if t > 0.25 and t < 0.75 then
 		if nvm.providing then
 			power.generator_stop(pos, Cable, 5)
 			nvm.providing = false
 			nvm.provided = 0
 		end
-		nvm.capa = math.min(nvm.capa + PWR_PERF * 1.2, PWR_CAPA)
+		if light >= (minetest.LIGHT_MAX - 1) then
+			nvm.capa = math.min(nvm.capa + PWR_PERF * 1.2, PWR_CAPA)
+		end
 	else
 		if nvm.capa > 0 then
 			if not nvm.providing then
@@ -88,7 +86,7 @@ local net_def = {
 	ele1 = {
 		sides = {D = 1},
 		ntype = "gen1",
-		nominal = PWR_CAPA,
+		nominal = PWR_PERF,
 	},
 }