Have a Multiplus Compact in an RV with Battle Born lithium batteries. Preparing the RV for a trip in winter temps: upper 20's F/ -2C. I plugged the RV into shore power and intended to use electric heaters to warm the interior. I did not want the batteries to charge at all due to the low temperatures (low temp charging can damage lithium batteries), so I tried setting the Multiplus to "Invert" mode instead of "On" and it would not pass through the available AC shore power that I wanted to use to run electric heaters.
I used an extension cord to bypass the Multi along with a portable catalytic heater to bring the batteries up to temp. When I switched the Multi to "Charge" I had AC pass through. And, of course, when set to "On" there was pass-through. But no pass-through when set to Invert.
Does this sound correct, functioning as expected?
TIA
Jim