Hours = Ah × V × % to refill ÷ (panel W × efficiency). Example: 100 Ah × 12.8 V ÷ (200 W × 0.75) ≈ 8.5 peak-sun hours, or about two sunny days. Loads running during the day slow charging.
Safety: These are general estimates, not a design. Follow your equipment manufacturer's instructions and local electrical code, and consult a qualified electrician for anything connected to shore power, a house, or high-current batteries.
About 8–9 peak-sun hours from empty for a 12 V lithium battery, which is roughly 2 days in most of the US.
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