[te0006]

If you have a south (or SE or SW) facing wall without much shadowing from nearby buildings or trees, vertikal mounting does work OK. Do not expect to reach the panel's nominal Wp rating though, output will peak at 50-70% of that. But panels are cheap - if there's enough room, just overprovision twofold. Just take care to buy an inverter that is OK with such a bigger configuration. And vertically mounted panels will generate more power off-season than tilted ones.

[Scoundreller]

How well does a biphasic panel work mounted vertically on a light coloured wall at least a meter+ away (depending on panel size) ?

[namibj]

Just clad the wall between the windows (if any) in panels? Eases the wind loading that way as wind can't really get behind them anymore.