A:AnswerAs we detail in the manual we do not recommend using solar charging as primary means of charging the item, we suggest you use the solar charging feature as an Emergency option to charge the item AFTER you have charged the item fully using charging cable. it would take upwards of 3-4 days to fully charge the item using only 7-8 hrs of optimal sunlight per day. From 0% it would take about 3-5 minutes before you can charge a device using the powerpack.
A:AnswerIt takes approx. 50hrs (daylight) to charge a 20,000 mah battery pack using only solar power. Formula is Battery capacity (20,000mah) divided by Solar Panel Rating (400mA)= 50hrs
A:AnswerThe formula for this answer is Powerbank Capacity (20,000mah) divided by Solar Panel rating (400ma) Your answer is 50 hours. Powerbank capacity and Panel ratings can be found on the lower back side of the product.