How long to run your pump

[badutahboy]

I have solar heating so I run the pump when I have strong sun. I have the pump set up on my home automation system. The system triggers the pump based on light sensor. If I have a day with no sun the system runs the pump for 2.5 hours around noon.
Steve

Sounds like an awesome setup. Tellme more about the light sensor.. any specific parts I'd need to set something like that up? I'm thinking of doing something very similar to that setup, but I didn't know there was much technology out there to run it based on weather conditions..