Also (just making the most of the time difference) - instead of using watchdog which only allows an 8s sleep, would it be better using a real time clock to sleep it for the 1 hour? - assume this would be more energy efficient.
I thought I would use a 12v sealed lead/acid battery - would it be likely that I would even need to trickle charge by solar if the scales were only being used for maximum 4 months? - more likely 2 - 3 months. I realise that the on board voltage regulator on the UNO will 'discharge' any additional energy supplied, can anyone suggest the best external voltage regulation? - presume I would only need to use a step down regulator, but perhaps there is a switching regulator available that could switch up or down as needed?
If i can find answers to even half of my questions I will be doing well!
Thanks all