The required panel watts = 1280Wh ÷ 10h = 128W Also, consider the charging efficiency of your solar system, which depends on both the battery chemistry and the type of solar charge controller used.
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To effectively charge a 120Ah battery, you typically need around 300W of solar panels. Use one 300W panel, two 150W panels, or three 100W panels. Ensure your configuration fits your RV space. Also, consider charging times and usage scenarios to optimize efficiency and performance.
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Result: You'll need at least 5 × 400W panels to fully charge a 10 kWh battery on a typical Texas day. But hold on—this is just the baseline. Keep reading for the real-world factors that change this number.
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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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