A solar system owner is experiencing poor performance, which they attribute to an incorrect installation where north and south facing panels are improperly connected to a single MPPT on their...

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  "detected_at": "2026-09-26T13:18:00+00:00",
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    "domain": "tesla.com"
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    "summary": "A solar system owner is experiencing poor performance, which they attribute to an incorrect installation where north and south facing panels are improperly connected to a single MPPT on their Tesla inverter.",
    "category": "implementation",
    "comments": [
      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc60g1h/",
        "depth": 0,
        "score": 13,
        "author": "Ragamuffin2502",
        "excerpt": "North and south panels on the same string is a definite red flag. Do they have tigo optimisers or similar?",
        "posted_at": "2026-09-26T13:21:50.000Z",
        "author_url": "https://www.reddit.com/user/Ragamuffin2502/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc685c5/",
        "depth": 0,
        "score": 4,
        "author": "Throwitaway701",
        "excerpt": "So from what you are saying here there is a strong of 7 + 4 and a string of 4 wired in parallel into a single MPPT?\n\n Newer panels handle this better but it is still unnecessary, lazy and bad. But a bigger issue would be 2 strings on 1 MPPT that are not equal, in parallel I'm assuming. Vastly different voltages there. Probably done because the 4 on the garage won't reliably hit start up voltage fo",
        "posted_at": "2026-09-26T14:01:20.000Z",
        "author_url": "https://www.reddit.com/user/Throwitaway701/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc60ba3/",
        "depth": 0,
        "score": 2,
        "author": "getabath",
        "excerpt": "I would not consider today a sunny day, it's average? A sunny day for me is generating 40-50kWh for the full day and my total solar generation would be a lot higher than it is right now",
        "posted_at": "2026-09-26T13:21:08.000Z",
        "author_url": "https://www.reddit.com/user/getabath/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc60lp2/",
        "depth": 0,
        "score": 2,
        "author": "Small-Accountant-418",
        "excerpt": "I have 10 400W Trina panels and was sitting at 2.8kW today.",
        "posted_at": "2026-09-26T13:22:40.000Z",
        "author_url": "https://www.reddit.com/user/Small-Accountant-418/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc61a1o/",
        "depth": 0,
        "score": 2,
        "author": "BossGroundbreaking69",
        "excerpt": "4.35kw total. SW currently doing 3.3kw on a single array",
        "posted_at": "2026-09-26T13:26:11.000Z",
        "author_url": "https://www.reddit.com/user/BossGroundbreaking69/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc66kwn/",
        "depth": 0,
        "score": 2,
        "author": "GreyDrReddit",
        "excerpt": "I have a small 2.5kw system. Made 5kw so far today. This is output for September:",
        "posted_at": "2026-09-26T13:53:33.000Z",
        "author_url": "https://www.reddit.com/user/GreyDrReddit/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc6jcbm/",
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        "author": "External_Mortgage363",
        "excerpt": "Yep as others have said no way should they have put opposing orientation on the same string. That will kill production.\n\n I have 4 roof spaces and noticed soon after install that they had only used 3 strings out of 4 available and 2 were connected from opposing roofs. As soon as I pointed it out that acknowledged that was wrong and fixed it within 7 days.\n\n Today hit a peak of 6.9kw across 29 pane",
        "posted_at": "2026-09-26T14:55:09.000Z",
        "author_url": "https://www.reddit.com/user/External_Mortgage363/"
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      {
        "url": "https://www.reddit.com/r/SolarUK/comments/1wqqcgl/comment/pc61sef/",
        "depth": 0,
        "score": 1,
        "author": "Alternative-hex",
        "excerpt": "18 panels - 3 ne 3sw and 12 s. Peaked at 4.5 today. Yours sounds a little low.",
        "posted_at": "2026-09-26T13:28:52.000Z",
        "author_url": "https://www.reddit.com/user/Alternative-hex/"
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    "evidence": [
      "[post] North and south facing panels are linked to the same string, while the garage panels sit on a second string; both connect to the same MPPT on the Tesla inverter.",
      "[post] I have complained, and the electrician visited the site, claiming everything looks fine and that the shared string is irrelevant."
    ],
    "virality": "high",
    "post_date": "2026-09-26T13:18:00.000Z",
    "post_kind": "text",
    "post_text": "Another day and again currently 30% behind forecast. I have 15 Aiko panels spread across three roofs, and at 2 pm with no cloud in the sky my solar output is 2.0 kW.\n\nAfter extensive research online and here, I am fairly certain the engineer installed the panels incorrectly. North and south facing panels are linked to the same string, while the garage panels sit on a second string; both connect to the same MPPT on the Tesla inverter.\n\nI have complained, and the electrician visited the site, claiming everything looks fine and that the shared string is irrelevant. In his words, it “just depends on a lot of factors, such as voltage” and so on. I suspect he simply does not want to return to the roof to run a second DC cable.I have put in an official complaint and I have to wait 7 working days for a response, but ideally I don’t want the same electrician on site. 1. He is the professional, and I am only a person that knows very little about the subject, and 2. I really don’t like confrontation.\n\nWhat else can I do at this point? Surely I am correct in saying that it’s not normal to be generating so little every day with a 7.25kW system?\n\nThanks",
    "sentiment": "negative",
    "subreddit": "SolarUK",
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    ],
    "post_title": "What is your solar output on a sunny day like today?",
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    "comments_total": 108,
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        "name": "Aiko Solar",
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