![]() ![]() This is so because the charger needs to supply more energy to higher-capacity batteries to get a full charge. Generally, batteries with higher capacities take longer to charge under similar charging conditions than batteries with lower capacities. As such, they generate less energy, and charging is slower. When panels are covered in dust, their efficiency drops. Solar system losses are solar power losses due to real-life factors not considered or simulated when testing solar panels. Of course, this will take longer than when the charger only has to refill the battery from 40% to 100%.īasically, the higher the DoD, the longer the charging time. When the battery is fully discharged (DoD of 100%), the charger must refill the battery from 0% to 100%. ![]() The DoD sums up how much of the battery’s capacity the solar charger must refill for the battery to be fully charged. Consequently, charging is faster.Ĭonversely, charging is relatively slower with PWM charge controllers because they are less efficient. Generally, MPPT charge controllers are more efficient than PWM charge controllers.įor this reason, when an MPPT controller is used with a solar charger, more solar energy is directed toward charging. \(charging time = \displaystyle = 4.5\ hours \approx 5\ hours\) Factors that Affect the Solar Power Charge Time Charge Controller Efficiency How to Calculate Solar Charging Time Using Battery Capacity and Solar Panel CurrentĪ simple way to calculate your battery charging time when charging with your solar panel is to divide the battery’s capacity by the solar panel current: It will also show a link to a calculator to determine the peak hours of your location. When you click on the button, it will display the result in peak sun hours. Lastly, click on the Calculate button for the result.For MPPT controllers, efficiency is around 93-97%. The charge controller type determines the charge controller efficiency the calculator uses in its calculation. Select your solar charge controller type from the list: There are two options: PWM and MPPT.Enter your solar panel wattage in its input field.With DoD, instead of calculating the time it will take to get the battery system from 0% to 100%, the calculator will calculate how much time it will take to get to 100% from the current charge level. For instance, if your battery’s charge level is 30%, the battery’s DoD would be 70% (100-30). Your battery’s DoD is basically how much of the battery capacity that’s been discharged. But with it, calculating the battery charging time is more accurate. Enter your battery’s depth of discharge (DoD): This step is optional.For one, it can give a general idea about your battery’s discharge depth. ![]() The battery type is essential to the solar panel charge time calculator’s work.
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