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dzl asked

How is "recommended number of cells in series for highest controller efficiency" (section 3.3 of smartsolar manual) determined?

I would like to understand the math or logic behind these recommendations. I understand that 'cells in series' is shorthand for operating voltage.


I assume that this calculation is a balance between maximizing voltage differential to optimize MPPT performance in less-ideal conditions, and minimizing voltage differential to optimize DC-DC conversion efficiency. Is this correct?


The recommendations only deal with 36 and 72 cell panels, I would like to understand the math/logic behind these recommendations so I can understand how it applies to 60 cell panels and 96 cell panels, etc.

For instance for a 24v battery, Victron recommends 144 cells in series. Would 120 cells or 96 cells be less ideal?

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dzl answered ·

Relevant section from the manual:



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