I noticed in some of the reviews that you can only attach 2-200 watt Boulder panels to recharge the Yeti 3000 for a total of 400 watts. However, on the Goal Zero web site it shows a chart "Yeti+Solar Charge Times" and at the bottom of the chart it shows the Boulder 200 x 6 and under the Yeti 3000 Lithium it says 3-6 hours. Can you clarify, if you can only attach 2 Boulder 200 panels for a total of 400 watts how can you attach 6 Boulder 200 panels for a total of 1200 watts?