I am wondering if i have a GaAs solar cell and a Si solar cell, what would be the best combination to achieve the max power:
have a two modules of series connected silicon (gaas) cells together, and then connect it to other module of series connected gaas (si) cell
or
connect one si cell to a gaas cell and then make a module out of this combination?
What sizes are your cells? They have rather different characteristics and if you connect them together you will in general get the worst performance not the best. It would be better to connect each group of cells of the same type to its own MPPT and sum the outputs of the two MPPTs.
Thanks. The cell size are around 15mm into 15mm.
Do you have any resource or reference i can read more in this topic?
Dear Amirhossein,
I agree filly with Tony, and add to him:
The rules of connecting solar cells in series that they have to have the same short circuit current.
The rules of connecting solar cells in parallel is that the solar cells must have the same open circuit voltage.
So, in your case since Ga As cells have higher open circuit voltage they could never be connected in parallel. They may be connected in series if their short circuit current is adjusted to be equal.
If this is not the case then one has as Tony said, add then in the load after cascading every one with the proper DC to DC converter.
Best wishes
after reading some research papers, and also the valuable comments above, I can agree with all above-mentioned comments
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