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The figure that matters is the surveyed installed total on your quote, divided by usable kilowatt-hours, with the same scope of hardware in every comparison. It is a screening tool for quotes, not the pence per kilowatt-hour on your electricity bill." } }, { "@type": "Question", "name": "Should I divide the quote by nameplate or usable kWh?", "acceptedAnswer": { "@type": "Answer", "text": "Use usable capacity from the datasheet for the model on the quote if you want a fair screen. Nameplate, or nominal, capacity includes a reserved slice that protects the cells and is not energy you can shift into the evening. Dividing the same total by a smaller usable figure gives a higher pounds-per-kWh result even though the hardware has not changed. 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