Heartland RVs John Hambrick walks through walk you through SŌL - Powered By The Sun packages, SŌL Prepped, SŌL190 and SŌL 380. Beginning in the fall of 2022, SŌL - Powered By The Sun is now a standard on all Heartland Travel Trailers and Fifth Wheels. This tutorial will show you how what is included in each package and how to install the panels and inverters.