Thanks Ambrogio for this very interesting and informative thread.

When I first read this thread I wondered why make your own Solar Regulator when I buy them for 20€ but obviously now I realise the models I use are not MPPT. The MPPT version costs 250€ so making your own is not only an interesting project but saves lots of cash.

I also realise that your design allows for Solar or Mains power which makes it even more interesting but I could not work out how the program/micro does the switching between the two power sources.