Figure out your latitude tilt. If you live below twenty-five degrees latitude, your solar panels will need to be tilted towards the sun in the amount of latitude number. If you live at twenty-five degrees latitude, you will tilt your panels by twenty-five degrees. After twenty-five latitude, add five degrees for each additional five degrees of latitude up to forty degrees. ( 35 lat = 50 tilt and 30 lat = 40 tilt) At forty degrees latitude, add twenty degrees of tilt to your latitude number. (55 lat = 75 tilt) Memorize that and say it back five times fast.