Have a look at:

 

Sample of the System Log

System Master Unit

System Slave Unit

Master/Slave- Solar Panel (40x40cm)-Charger-Battery (24V/2.8Ah)-Radio Modem Connection

PC-Radio Modem Interface

 

Installation of 10 ventilators

 

Open ventilator; with rain and temperature sensors (to the left) and external emergency battery driven ventilator opener (to the right)