rjxj wrote:
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.
UL458
EDIT: 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.
OK, that's what I wanted to hear. Can I ask how you know the PW SW is bonded? I did do a power off test with a multimeter and measured ~1 ohm between G and N at the output plug, and also ~1 ohm between the chassis ground terminal and either neutral or ground on the output receptacle. My crummy multimeter reads 1 ohm also for when I touch the probes, so I think that's about as low as it goes. So that could be proof enough?
FWIW, it's not clear to me that UL458 actually implies bonded GN. I had thought it did, but see for example
this FAQ entry directly from Xantrex. It claims directly that UL458 does not require bonded neutral for at least some applications.
So what I gather is that UL458 is not enough - if the manufacturer is positioning it as a "temporary installation" type device under UL458 bonding is not required.
