|PV maximum curve for January|
By this day last year, the Sunboxes had captured only 25 kWh and in the same time of the present year, this one has captured 67 kWh. So perhaps the insulated design has been worthwhile.
During the cold part of the morning after the Sun had got up and was moving to the south, the temperature inside the SB was safely above 25ºC. The daily GSHP consumption for the day was below 20 kWh, which is unusual for such a cold day.