Thank you. Yes, solar hotwater controller looks like an constructor - you have to connect all parts togather according to instructions and upload the firmware. And you will get many functions and low price. The functions are: Menu, configuration, Antilegionella, SD log of data, Frost protection, Bypass and others... Price of all components for me is about $35 - it should be very cheep for most of you.
My solar sysytem works even if there is -16C on the street (3.2F) For now, from November to current day 25th of Fab it produced about 1400 kWh or about 1.4 mWh Actually i have online monitor of my sysytem and archive of all temperatures, but it is not in english. I may try to translate it too. My heating space is about 160m2 for now and i use gas if there is no sun.
Online monitor (not English) Now is night in Ukraine so system does not work but produced almost 23 kWh today.
Old picture of online monitor with -16.6C (2.12F) street temparature.
