Things are getting interesting once you have data!

A project log for Solar Water Heating Controller

Hot Water with STM8 eForth

thomasThomas 09/26/2018 at 10:310 Comments

This is an interesting finding: starting up the solar heating circulation pump in the morning comes at a cost: the temperature as measured above the heater coil in the storage initially drops by several degrees [°C], and it takes full hour of late September morning sun for it to return to the initial value. This could mean that when the sky is cloudy starting the heating can be a net loss!

Of course, this also shows potential for innovation:

In any case, I wouldn't have thought that a system this simple can show interesting behavior!