Is there water or fluid inside the wall mounted solar panel?

There is a bracket inside the wall-mounted solar panel. Solar wall mounts use thermal fluid whose basic component is propylene glycol, which has similar performance to antifreeze (ethylene glycol) added to cars. However, it does not corrode and has a lower freezing point. It will not have any adverse effects. on copper thermal tubes and heat collecting plates. However, because it is a split type, there is heat loss during the heat conduction and heat exchange processes, and its thermal efficiency is not high if the water is used daily, it can rarely reach 60 degrees.