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Panels in a series string must all run at the same current, so a bright east roof and a dull west roof are forced to one compromise operating point that suits neither face. The usual fix is to put each orientation on its own MPPT input, so each roof can track its own best point. If the inverter has only one usable tracker, optimisers or microinverters are the common alternatives, chosen from the survey rather than by habit." } }, { "@type": "Question", "name": "Is an east–west array worth doing at all?", "acceptedAnswer": { "@type": "Answer", "text": "Often, yes, provided it is wired as two arrays rather than one shared string. An east–west layout produces earlier in the morning and later in the evening, which can match household use better than a narrow midday peak. A shared string erodes that benefit, because the mismatch is largest when the two faces differ most. A roof that only faces east is not a dead roof; the aim is to stop good panels being held back by the wiring." } }, { "@type": "Question", "name": "Can I add west-facing panels to my existing string later?", "acceptedAnswer": { "@type": "Answer", "text": "That is the cheapest-looking option and the one most likely to disappoint, because a different orientation on the same string creates mismatch every day. Check first whether your current inverter has a spare MPPT input that can take the new face as its own string. If that slope is too small to reach a sensible string voltage, the better choices may be a different inverter, optimisers on that slope, or leaving those panels out." } }, { "@type": "Question", "name": "When is it acceptable for two roof faces to share a string?", "acceptedAnswer": { "@type": "Answer", "text": "A single string is reasonable when the panels all sit on one face, with the same pitch and no meaningful shading, or when a second face differs only slightly in direction. It can also be the lesser compromise if a small group of panels cannot reach the inverter’s start-up or MPPT voltage window on its own, especially in winter. In that case the designer should compare a shared string, optimisers, a different inverter, or dropping the small face." } }, { "@type": "Question", "name": "Do optimisers make separate MPPT inputs irrelevant?", "acceptedAnswer": { "@type": "Answer", "text": "No. Optimisers and microinverters give each module its own operating point, which helps on complex or shaded roofs, but they add components and more things that can fail. They are a tool for mismatch, not a default substitute for sensible string design. Separate MPPT inputs remain the straightforward fix when each roof face can form a valid string on its own." } }, { "@type": "Question", "name": "Will splitting the strings change my export or metering?", "acceptedAnswer": { "@type": "Answer", "text": "No. The split happens on the DC side, before the inverter converts power to AC. Metering, the AC connection and any export arrangement sit downstream and are unaffected by how the panels are grouped. 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Also ask whether shading has been surveyed through the year, including chimneys, dormers, neighbouring roofs and trees." } } ], "about": { "@id": "https://kilowatts.uk/blog/east-west-roofs-one-string-mppt/#content" } }, { "@type": "WebPage", "@id": "https://kilowatts.uk/blog/east-west-roofs-one-string-mppt/#webpage", "url": "https://kilowatts.uk/blog/east-west-roofs-one-string-mppt/", "encoding": [ { "@type": "MediaObject", "encodingFormat": "text/markdown", "contentUrl": "https://kilowatts.uk/blog/east-west-roofs-one-string-mppt.md" }, { "@type": "MediaObject", "encodingFormat": "application/ld+json", "contentUrl": "https://kilowatts.uk/blog/east-west-roofs-one-string-mppt.schema" } ], "name": "East and West Roofs on One String: The Hidden Solar Loss", "headline": "East and West Roofs on One String: The Hidden Solar Loss", "description": "Wiring an east roof and a west roof into one solar string forces both to share one operating point. 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