I use my Inergy Flex. It is 13.8 (if memory serves). It runs mine just fine.
From my understanding the latches are stronger and the batteries have a warmer so it can charge in the really cold…but that might affect the actual power consumption…
You should definitely get the UPS fast charger that’s a game changer… legit charge 2 batterys is like 2 hours from 0 to 100…the generator I got takes longer but it’s nice to have the piece of mind if I need to need to I can charge it a little bit…or hunt down a place with a plug…