This is possible because the electronics employed allow current to flow from the charging source to each of the battery banks separately

The Selene CS is an IP40 recessed Power LED downlight

Adjustable Flange (Internal Cooling Unit) - 1

During charging the DDC-12/24 monitors voltage at the house battery

Ted C Dual 2+2W IP40 Product Option:Warm/Blue - Satin Trim This is possible because theThe Ted Club Dual is an IP40 recessed Power LED downlight. It has an 72mm round trim composed of AISI 316 stainless steel and a frosted lens. Weight N A Dimensions 0. 25 0. 25 0. 25 in Bulb Color Warm Red, Day Red, Warm Blue, Day Blue Trim Finish White, Satin, Stainless Steel Manufacture Link