In a previous video, Engineer775 and his crew installed a 3-array off grid solar system for a homeowner client. In the video below, he talks about the SunDanzer direct current (dc) powered freezer installed in the same household.
They’re using this freezer unit to minimize the load on the inverter. The inverter coverts dc power from the batteries to alternating current (ac) for powering the rest of the home.
Essentially, this freezer uses power directly from the batteries (and charge controllers) … almost direct from the sun.