The formula is: Charging Time (hours) = (Battery Wh × DoD) ÷ (Panel W × Efficiency) Let’s break it down in plain English: Battery Wh is your battery energy in watt-hours. DoD is how much of the battery you want to recharge. Panel W is your solar panel’s power rating. Efficiency is the real-world system efficiency (usually 70–95%).
Example: 100Ah or 1200Wh. Measured in watts (W), it indicates the amount of power the solar panel can generate. Higher wattage panels charge batteries faster. The number of effective sunlight hours per day impacts charging time. On average, 4–6 hours of full sunlight is used for calculations. The current charge level of the battery.
Number of solar panels x wattage of individual solar panels = total wattage of solar panels For example, assuming you have 20 units 200w solar panels in your solar system, according to the above formula, you can enter 4000 into the solar panel wattage column of the calculator. 2. Solar battery Capacity (Ah)
For example: A 100Ah battery at 12V is 1200Wh. If you discharge it by 50%, that’s 600Wh to replace. With a 200W solar panel at 85% efficiency, the panel delivers 170W. Divide 600Wh by 170W and you’ll get about 3.5 hours of full sunlight. Enter your battery capacity. You can use Ah or Wh. If you use Ah, also enter the battery voltage.
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