Originally Posted by romakdaddy
ok here's the story..im now the proud owner of an 89 370 airstream with a onan genset and trace u2512 inverter. I just replaced all the batteries and cant fire up the generator until I flush the stale gas out and replace some rotted fuel lines. My biggest concern is it will run AC power off the inverter on batteries but when you plug it in all I get is a click every 10/15 sec coming from the inverter. I'm assuming there's either a short somewhere or something's got too big of a load for the inverter but I'm confused why it will run fine off batteries and not on shore power.is there a switch I need to flip or is it all automatic? I'm still learning how all these systems work so ill take any advice or instructions you have to offer. I posted this issue in another section but have gotten no responses so I thought id try here. Plus I removed the breaker covers and holy cow what a mess...electrical tape everywhere and one of the breakers wasn't even hooked up anymore. I do have basic understanding of household wiring as I've wired 2 houses completely from service to outlets but the whole switchover thing is like magic to me...I did notice a relay in the bottom panel so I'm dying to get this old girl working again.
Your Trace inverter should contain an internal transfer switch that will perform 2 functions: (and possibly 3)
First, it will allow 120VAC to pass thru the inverter into the 'inverter designated' AC circuits in the coach when either shore power or generator power is present.
Second, when no external 120VAC is present and the 'invert' switch is on, the transfer switch changes position to allow the inverter to pull 12VDC from the batteries, send it thru the FET board and transformer and produce 120VAC for the designated 'inverter circuits'. Note, this does NOT power the entire coach.
If your inverter is also a 'charger', then when on shore or generator power, it will be responsible for producing '12VDC' in varying voltage and amperages to properly charge your batteries.
This is the full function of the an inverter/charger.
If you can get 120VAC into some circuits from the inverter when NOT connected to shore power but get nothing when you ARE connected to shore power, then the problem generally lies with the internal transfer switch in the inverter. Repairs are usually not a problem........ so long as the required parts are available.
Trace is no longer in business, having been absorbed by the Xanterx megalith, so I would seriously doubt that parts are available as Xantrex no longer supports older Trace models. It is worth a shot, though.
There also may be other issues with your wiring, including but not limited to the coach's transfer switch (a different animal from the one IN the inverter) and it's ability to pass 120VAC power into the coach. This would seriously effect the inverter's function as well.
You have a bit of electrical trouble shooting to do.........
Hope you're good with a multi meter...............