Simply perfect product. 2 weeks of free camping and the Solaris charged 4 mobile phones. We placed it on the tent from 7:00 to 13:00 and it had charged our devices from 25%-40% to 100%. On cloudy days, it still charged but slower. The mobile phones of the whole group were around 4,000-5,000 Mah. Very practical that it can charge 2 devices simultaneously.