Cor van de Water via EV wrote:
That was also my immediate thought (being an engineer) so all I can think is that the solar roofing is directional, like shingles, so you can't flip it around. They could have made two variants though, one with + at top and one at bottom, so you just would have to alternate them and can plug them directly into each other without long wires, similar to how adjacent solar panels wire to each other in one string using polarized weather-proof connectors.
The solar roofing I have (Unisolar PVL-144) happens to put both + and - on the same end. But to do it, they run an 18-foot long wire from the + at the far end back down so it's next to the - at the other end. This wire is embedded in the panel, so it can't be removed without surgery. Thus you're "stuck" with these long wires, whether you need them or not. :-/
The panel is 15" wide and 18 feet long. It's intended to be installed in sheet metal roofing, in the wide "valley" between the ridges on each edge _/\________/\_. The sheet metal roofing is installed vertically. It doesn't matter whether the PV terminals are at the top or the bottom, though for convenience you're certainly going to put them all at the same end.
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