![]() Each makes a number of assumptions that aren’t obvious to the untrained eye. I’ll run through each method step by step, starting with the simplest and ending with the most complex. ![]() How to Calculate Charging Time of a Battery By Solar Panelsīesides using our calculator, here are 3 ways to estimate how long it’ll take to charge a battery with solar panels. In that case, you know it’ll take about 2 days for your solar panel(s) to charge your battery. For example, let’s say your estimated charge time is 8 peak sun hours and your location gets on average 4 peak sun hours per day. You can use our peak sun hours map or calculator to find out how many peak sun hours your location gets. Your estimated charge time is given in peak sun hours. If you’re using a 400W solar array, you’d enter the number 400.ħ. If you’re using a 100W solar panel, you’d enter the number 100. Enter the wattage of your solar panel or solar array. (If you have a lead acid battery, keep in mind that they should usually only be discharged 50%.)ĥ. If your battery is 80% discharged, you’d enter the number 80. Optional: Enter your battery depth of discharge as a percentage. Select “Lithium (LiFePO4)” if you’re using a lithium iron phosphate battery.Ĥ. Select “Lead acid” if you’re using a flooded or sealed (AGM or gel) lead acid battery. (If you only know your battery’s capacity in watt hours, first convert watt hours to amp hours.)ģ. If you have a 50Ah battery, you’d enter the number 50. Enter your battery capacity in amp hours. For instance, if you’re using a 12V battery, you’d enter the number 12.Ģ. Tip: If you’re charging your battery with a battery charger rather than solar panels, check out our battery charge time calculator. To maximize your battery’s lifespan, consider using a smaller solar panel or a bigger battery. Many battery manufacturers recommend a maximum charge current of for lithium iron phosphate batteries with this capacity. Warning: We estimate that a solar battery charging setup with these parameters has a maximum charge current of.
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