What should I do with my solar system when going on vacation?
In the event of holidays (no demand for domestic hot water), there is no risk of letting the water stagnate in the DualSun hybrid solar panels, thanks to their design preventing them from overheating.
However, it is possible to keep the hydraulic system activated to guarantee the cooling effect of the photovoltaic cells in order to increase their DualBoost electrical production efficiency.
To do this, simply activate the tank cooling mode with holiday option on your DualSun regulation. This function cools the tank overnight to prepare it for heating the next day.
SLL Resol regulation
In the H-DAY menu, make the following settings:
| Setting | Description | Adjustment range | Recommended value |
| ORR | Tank cooling option | ON / OFF | ON |
| DTRO | Activation temperature difference | 1,0 … 30,0 K | 10,0 K |
| DTRF | Switch-off temperature difference | 0,5 … 29,5 K | 5,0 K |
| TRRV | Holiday tank cooling temperature | 4 … 95 °C | 30 °C |
These settings become active only after activating the holiday function in the DAYS parameter. This parameter is accessible via the microkey (see its location in the figure below). It allows you to define the number of days of absence. A non-zero value activates the functions set in the H-DAY menu by counting down the remaining days from 00:00.
CS2 Resol regulation
| Setting | Description | Adjustment range | Recommended value |
| ORR | Tank cooling option | ON / OFF | ON |
| SHEEP | Holiday cooling option | ON / OFF | ON |
| TVAC | Holiday cooling temperature | 20 … 80 °C | 30 °C |
>To go further : What is the maximum temperature that can be reached at the outlet of a DualSun panel?
