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Solar Panels Underperforming Against Promised Output Letter

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Write a letter to a solar installer because your system produces far less than the quote said, with output data and a remedy request.

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Write a letter to a solar installer because my system is producing far less than the quote said. Inputs I will provide: installer [INSTALLER_NAME], contract date and system size [CONTRACT_AND_SIZE], promised yearly output [PROMISED_OUTPUT], actual output by month [ACTUAL_OUTPUT], shading or roof facts [SITE_FACTS], monitoring app screenshots [MONITORING_DATA].

Please have the letter include a short table of promised and actual output, say what the quote assumed, and ask for an inspection, an explanation and a remedy if the system or the estimate was at fault.

Documents that usually matter: The signed quote with its production estimate, the design report, monthly production data, photos of the array and any shading since install, and the inverter error log. Realistic outcomes to ask for: A site inspection, repair or adjustment under the workmanship warranty, a corrected estimate, a partial refund if the estimate was unreasonable, and written findings. A typical reply: Installers often say production varies with weather and that estimates are not guarantees; reply by asking what range was stated in the quote, how weather was accounted for, and what the inspection found [VERIFY contract wording].

Begin with a numbered list of exhibits for the solar panels underperforming against promised output letter (exhibit number, description, date, what it proves), name what I still lack, and then write the letter and refer to the exhibits. Return the letter itself with a short cover note, around 50 words, and next an if-ignored ladder (ask for an inspection, then the company owner, then a trade body or consumer agency), then a proof checklist (quote and estimate, design report, production data, photos, error log). Send it with a clear subject line and the PDF attached, and save the thread and any automatic reply and ask for a reply confirming receipt.

Stay calm, plain and courteous, with no insults or empty threats, put the date from [DEADLINE] on any request, and be honest about limits. Write this as myself, not on anyone's behalf, without posing as counsel. Name no legal rule you cannot source from my input; use [JURISDICTION] and [RELEVANT_LAW_OR_POLICY_IF_KNOWN] as given, and add a line telling me to confirm the rules with a professional or consumer agency. None of this is legal advice.

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Dear Customer Care Manager,
Our 6.4 kW system was commissioned on 2 April. The quote of 14 February estimated 6,300 kWh a year, about 525 a month. Over May to August the inverter app shows 318, 342, 360 and 351 kWh, an average of 343, which is 65 percent of the quote's monthly average. There has been no new shading and the app shows no errors.
Please arrange an inspection of the array and inverter, send me the design report, and explain in writing how the estimate was produced. I would like a visit within 14 days.

• solar