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Old 05-14-2016, 09:49 PM   #1
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New Inverter, weird behavior

So we have a new Go Power 1500W pure sine wave inverter hard wired into our 110v panel. Professionally installed... 4GA wires directly from the battery feed the inverter. We also have an automatic cut-over switch so if shoreline / generator is feeding the 30A inlet the inverter gets disconnected from the system automatically, and when you disconnect shore line the inverter kicks in after a few moments...

Man it's great, hit a button and all the 110 outlets are alive (with the exception of the microwave and AC).

So while boondocking the other week the family is watching TV, and it was cold outside so we were running the gas furnace (2008 25' international for what it is worth). And this is the weird behavior... when the furnace gas clicks off during it's cycle (but fan continues to run) the TV experiences a brief moment where the picture gets kinda scrambled.. a "blip" if you will. (new / modern 28" samsung LED TV)

Before we hard-wired the 1500W Go Power Unit, I had a had a 300W Go Power pure sine wave Inverter that I used via a 12v outlet, and plugged the TV into that... but never had this issue (one of the reasons I chose their 1500W version).

Thoughts on what is causing the 'pulse' / 'blip' in the system and any advice on how to address? Any guidance would be appreciated!

Thanks in advance.
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Old 05-14-2016, 10:01 PM   #2
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So we have a new Go Power 1500W pure sine wave inverter hard wired into our 110v panel. Professionally installed... 4GA wires directly from the battery feed the inverter. We also have an automatic cut-over switch so if shoreline / generator is feeding the 30A inlet the inverter gets disconnected from the system automatically, and when you disconnect shore line the inverter kicks in after a few moments...

Man it's great, hit a button and all the 110 outlets are alive (with the exception of the microwave and AC).

So while boondocking the other week the family is watching TV, and it was cold outside so we were running the gas furnace (2008 25' international for what it is worth). And this is the weird behavior... when the furnace gas clicks off during it's cycle (but fan continues to run) the TV experiences a brief moment where the picture gets kinda scrambled.. a "blip" if you will. (new / modern 28" samsung LED TV)

Before we hard-wired the 1500W Go Power Unit, I had a had a 300W Go Power pure sine wave Inverter that I used via a 12v outlet, and plugged the TV into that... but never had this issue (one of the reasons I chose their 1500W version).

Thoughts on what is causing the 'pulse' / 'blip' in the system and any advice on how to address? Any guidance would be appreciated!

Thanks in advance.
First, how far is your inverter from your batteries? 4AWG is pretty small for a 1500 watt inverter and you might be experiencing DC circuit voltage drop, causing the 'blip'. Next, is the inverter wired to your batteries with it's own dedicated circuit or is it connected to an interim bus bar?

Too many potential issues to troubleshoot without being there.

Best solution is to have your 'professional' come back and re-check the entire installation.
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Old 05-14-2016, 11:05 PM   #3
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Hi Lew - thanks so much for taking the time to respond, your experience is invaluble.

Apologies I misspoke in my original post, I just went and double checked and the cables are 2 guage. (2 AGW CCI Royal Excelene Welding cables to be exact)

Cable length is about 3 -4 feet max perhaps. Inverter is located at the very front of the trailer (near the bus bar), under the couch / on the floor. Inverter battery cables (pops/neg) go through a hole in the floor then into the front battery box.

There is an in-line fuse between the inverter and battery. Both pos/neg cables run directly to the battery, and are isolated from the bus bar, which is fed by a separate set of cables originally installed at the factory (Inverter is on it's own circuit...).

There is also a white (ground?) wire that terminates into the negative terminal on the inverter. It's hard to tell where it goes but my assumption is that it attaches to the frame somewhere (it does not exit through the floor with the post/neg battery cables).

Does this help?
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Old 05-14-2016, 11:11 PM   #4
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Perhaps that white (ground?) wire needs to be attached to the ground lug vs. the neg. battery lead?

I'm dropping the trailer back at my installer on Monday for them to take a look...
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Old 05-14-2016, 11:34 PM   #5
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Ok I believe I figured out what the white wire is... It is a 6ga neg. wire that runs to my solar controller (I upgraded to 6ga wire when I added 2 additional panels on the roof at the same time I had the inverterer installed).

So the Inverter is not grounded via the lug, and the neg lead to the solar controller piggy backs off the inverter neg battery lead.

Probably not ideal.
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Old 05-15-2016, 12:29 AM   #6
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Did this happen once or is it repeatable?




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Old 05-15-2016, 12:38 AM   #7
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Repeatable... I.E. When the furnace is running and the gas valve clicks off it disrupts the TV signal... It did it each and every time the furnace cycled on our last trip...

I'll test again tomorrow to be certain.
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Old 05-15-2016, 07:58 AM   #8
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Ok I believe I figured out what the white wire is... It is a 6ga neg. wire that runs to my solar controller (I upgraded to 6ga wire when I added 2 additional panels on the roof at the same time I had the inverterer installed).



So the Inverter is not grounded via the lug, and the neg lead to the solar controller piggy backs off the inverter neg battery lead.



Probably not ideal.

Your inverter case is not grounded and definitely should be! Also, there should be no other connections at the inverter's DC input terminals other than the 2AWG battery cables.

Your 6AWG solar negative should either be connected directly to the battery negative post or the shunt (if you have one in use.

Better have your installer make the corrections. And BTW, that fuse in the positive inverter cable is there to protect the cable......... NOT THE INVERTER and should be located within 18" of the positive battery terminal.


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Old 05-15-2016, 08:27 AM   #9
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On my Xantrex 1800 watt Prosine inverter, the green wire is grounded to the DC bus bar through a 2AWG cable. There was a warning not to connect it to the AC bus bar as it would cause current to back feed. On the AC side the neutral ties back to the inverter. Not the neutral bus tied with other AC circuits such as your microwave and air conditioner if not powered through the inverter.


An inverter coupled with a transfer switch is a different animal to wire. I agree it sounds like your problem is in the grounding of the unit.
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Old 05-15-2016, 08:37 AM   #10
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Thanks guys! I'll have them make those corrections and report back!
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Old 05-28-2016, 11:31 AM   #11
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Ok so we grounded the inverter chassis and ran the neg solar controller wire directly to the negative bus and all is good!
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