The difference is that some are grid tie and some are mobile applications. Mobile will be stickered or in operators manual as UL458. My prowatt SW 600 is bonded and it is that ul rating.
UL458EDIT: My book says it's UL458
I thought it was on the unit also but it's installed in a cabinet and I can no longer see it.
I recently worked on a friends rig and found that they bonded the sub panel. His magnum inverter charger has pass through so it has a GB relay. When shore power is off the relay bonds the inverter. When shore power is connected the relay removes the inverter (downstream) bond. Our prowatts are always bonded.
