Just used this on a car-camping trip to recharge a Goal Zero Yeti 150. I wasn't sure what to expect, but, I knew I wanted a panel large enough to recharge the Yeti within a 6-8 hour period, My friends and I ended up draining the Yeti down to about 20% over the course of a couple of days, so I pulled out the panel, plugged it in (with the various required adapters), and threw the panel out on the windshield of my truck. The weather was somewhat overcast, with intermittent periods of full sun. Aside from needing to move it a couple of times to keep it in the sun as the trees shaded my truck, it managed to fully recharge the Yeti in about 6 hours under those conditions. Worked perfectly!