I would like to note that the relayrunner system has been in use in lots of systems. Even non growing systems. 1 failure in 57,000 control sequences, and that would not have happened, computer battery died at the same time a power went out. Now you can controo up to 256 relays witn 6 on/off a day. I have only been able to use 8 controls a day. This system works and if fail safe, user friendly, and cheap, and old window system are real cheap, bought one for 10 buck. I blew 3 bucks for a new computer battery. Its been a little over a year now , it keep on growing.