Solar panels are rated under Standard Test Conditions (STC), which assume peak sunlight exposure of 1,000 watts per square meter—known as “peak sun hours. ” Most high-quality residential panels perform optimally with 4 to 6 peak sun hours per day.
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Domestic solar panel sizes in the UK usually range from 250 to 400 watts with an average of 350W. The following formula can help you work out the solar array size you require: Get your free fixed-price quote from Heatable — a Tesla Premium Installer with no hidden fees or sales.
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Grid-connected solar systems typically need 1-3 lithium-ion batteries with 10 kWh of usable capacity or more to provide cost savings from load shifting, backup power for essential systems, or whole-home backup power.
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For a 15-panel array on a 3-phase supply, you allocate 5 panels to each phase — connected to three separate single-phase inverters or via microinverters assigned to each phase at the consumer unit.
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