Cell Spacing on the Panel – 2mm between cells.
One thing I notice on many of the DIY designs is the amount of wasted space on the panel.
The professional panels do what they can to make the panels as light and efficient as possible. To that end, they put the cells very close together but not touching. They leave 2mm between cells, or about the width of the tab wire running through the cell. This probably leaves a little room for heat expansion. It is also aesthetically pleasing.
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