双排背靠背 ±10° 东西朝向，牺牲 8~12% 发电换 1.5 倍装机密度，平屋顶高电价自用场景主流。
Back-to-back +/-10-degree E-W pairs trading 8-12% yield for ~1.5x density; mainstream on flat roofs with high self-use value.
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