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East and west slopes are out of step: one is bright in the morning and the other in the afternoon, so they do not share a best voltage. Separate trackers let each face sit at its own maximum power point. One shared tracker forces a compromise that neither face wants." } }, { "@type": "Question", "name": "What happens if both roof faces share one tracker?", "acceptedAnswer": { "@type": "Answer", "text": "The inverter picks one voltage that is not the peak for either slope. The bright face is pulled off its maximum, and the dim face misses its own peak too. Across the day you get a flattened curve rather than a proper morning peak and afternoon peak. The loss is largest on clear days, when the two faces see very different light." } }, { "@type": "Question", "name": "Are two DC sockets the same as two MPPTs?", "acceptedAnswer": { "@type": "Answer", "text": "No. Some inverters have two pairs of DC terminals that are joined inside onto a single MPPT. In that case east on one socket and west on the other only tidies the wiring; both strings still share one voltage. Check the datasheet for the number of independent MPPTs, not the number of inputs or strings per tracker, and get the split in writing." } }, { "@type": "Question", "name": "Is this the same problem as shading?", "acceptedAnswer": { "@type": "Answer", "text": "No. A chimney, tree or neighbouring roof blocks light. Orientation mismatch is electrical: there is plenty of sun, but not the same amount on both faces at once. Adding more panels to the same input does not fix that. Hard shade on one slope is a separate question, and may need optimisers or microinverters so those panels can track individually." } }, { "@type": "Question", "name": "How does a split east–west array change the shape of the day?", "acceptedAnswer": { "@type": "Answer", "text": "A south-facing array tends to give one tall hump around midday. 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