Is it possible to have frost on a SPRING4 solar panel?

Yes, it is possible to have frost on SPRING4 finned and SPRING4 non-insulated solar panels when they are coupled to a solar thermal heat pump: this is a natural phenomenon which does not prevent the panel from functioning.

The strength of Dualsun SPRING finned panels is that they operate day and night, when the heat pump is operating, by negative (down to -15°C or -10°C dependenting on the heat pump models) as well as positive temperatures. 

In the case where there is little or no sunlight, the temperature of the liquid circulating in the panel is potentially lower at air temperature.So, in cold and humid conditions, water in the air can condense or even frost on the panels on the front side as on the back side. Moreover, such a state change process corresponds to an increase in the thermal power delivered by the panels. 

In harsh climates, the panel may even completely frost until you see frost appear between the fins.. this exchange capacity with ambient air can be reduced by up to 25% during the coldest winter nights. In France, that rarely happens it therefore has a low impact on the seasonal system performance (SPF).

When day breaks, the increase in ambient temperature and the first rays of the sun will allow the frost on the front of the panel to melt, and photovoltaic production will not be significantly affected.

To find out more: How does the delta temperature of the SPRING panel change depending on external conditions?