Hello I'm new to this forum
I have Daikin althemra LT split type witch im already using for two years and i need some advice about a thought i have stuck in my head for some time.
The pump is used only for space heating, heating with rads, there is no DHW, as on the picture.
pic_1.jpg
Since i have a lot of sunny days during the winter and those days the ambient temp can come up to 15C, I'm thinking of adding a buffer tank with some solar vacuum tubes witch will support the heating, all of the parts will be non daikin as on the pic.
pic_2.jpg
Here is the problem.
How to make the both systems work at the same time?
As the manual says, the altherma will shut off if the heated water is more than 55C.

On a sunny days, the pump dosen't cycle very offten, and the produced heat from solars could pass the 55C boundary. The circulating pump from the altherma wont turn on to cycle the water and slowly dump the heat in the rads if the heating demands are satisfied.

If i make the buffer as auxiliary heating, than the buffer will be non usable from the altherma and will be only used for heating from the solars.

Is this possible to work somehow or it's not worth the trouble.
So any advice is welcomed.
Sorry for my language, as english is not my native language.