For the paltry price difference, I recommend the same 20Ampères model. Light product appearance gadget but does a very good job. Charge control is stable and the discharge of the battery when the solar cells do not produce is almost insignificant. The manufacture of the electronic part is rather neat and clean, the power elements of the radiators are dimentionnés. In short a quality / great price. The delivery time has been met, and quite correct packaging. It remains to be seen if the reliability is waiting for you ...