Works down to -10 or does it...
Battery recomended for outside installation and advertised to opperate up to -10. At first cold snap of winter -5 min it stops working. Technical support say: when the temperature is between 1C and 5C, the charging power is reduced to 0.252kW; when the temperate is below 1C, the battery charging is stopped. If you pretty much anywhere in Europe or outside the most southern states in US don't install outside.