Hi, need some help for solar panel program (attached).

I need to compare temperature between solar panel PT100 (B017) and hot water tank PT100 (B001) to activate solar panel pump (Q7) only in this condition:

- Temperature of solar PT100 must be 5°C higher than tank PT100

Thanks all

ixo65

Hello franc82,

at first welcome to the forum.

Attached the modified diagram.

If the solar Pt temperature is 5 °C higher than the other Pt temperature, the solar pump will be switched on. If the temperature difference drops to 3 °C or less, the solar pump switched off.

Thanks very much ixo65! Tomorrow i'll test it!

Thanksssssss

Good morning, program works well 

Thank you very much

Hi Franc82,

Just now i found your post.

At my home i have a simular setup, Two hot water panels and a 600 Ltr. storage tank.

In my setup i found one problem .... when at night or winter.

From the storage tank to the solar panel (the panel is a 1.5 Mtr higher) i have thermo sifoning, as a result i losed my heat.

I used a simple solution by installing also a electrical controled valve, also because in my area in the winter from time to i have freezing tempuratures i also needed to solve this.

So by a seperated output , 1st open the valve and then 2nd i start the pump this for normal control.

then when the temp from the panel drops below -5 C (i use antifreez -10C) i open only the valve , the same thermo sifoning i use now to slowly warmup the panel and stop again at 0C.

also i have a 3rd heating loop on my storage tank from my central heating , if required it takes the storage tank up to 50C.

If you need something like this let me know and i include this in the program from IXO65 .