I picked up this 4x HPP to 1x HPP+ Solar Series Combiner to wire four HPP panels in series, and it does exactly what it says. The 1 ft 10 in length and 12 AWG gauge feel solid, and the 20 A rating matches my setup. Just remember it's only compatible with Yeti PRO 4000 when using more than 600 W of solar, and not with Yeti X Line. If you have HPP-equipped panels and need a clean series connection, this is a simple, well-built solution.