Reply
 
Thread Tools Display Modes
 
Old 09-10-2009, 12:25 PM   #1
Bus Nut
 
ezbme's Avatar
 
Join Date: Apr 2009
Location: Datil, New Mexico
Posts: 642
Year: 1989
Coachwork: Thomas Transit Liner
Chassis: Freightliner
Engine: CAT 3208 Turbo
Grounding the inverter question

I am about to finish the off grid power in my bus & have a question about grounding my inverter... I have a Xantrex sinewave 1000 watt inverter with the instructions but am not sure if they want me to take the ground directly from the neg post of the inverter to the body of the bus or not. Is this the way it connects? I would imagine a ground to the wall would be sufficient as the bus is all steel? I am def a newbie electrician & am learning as I go...

Thanks,
Jonathan
ezbme is offline   Reply With Quote
Old 09-10-2009, 12:35 PM   #2
Skoolie
 
bikeforthelight's Avatar
 
Join Date: Aug 2009
Location: Lakeland, Florida
Posts: 232
Year: 85
Coachwork: Blue Bird
Chassis: Ford
Engine: Gas
Rated Cap: 66
Re: Grounding the inverter question

thats what i would do jonathan....i mean the whole bus is grounded already, so grounding to the frame, floor, or wall should all be the same. i mean, most twelve volt lighting systems are grounded through the screws holding them to the ceiling, so i think it works either way.
__________________
Im Johnny. I Bike For The Light. I love missions. I think students rock. I make my mark.
http://www.bikeforthelight.com
bikeforthelight is offline   Reply With Quote
Old 09-10-2009, 03:10 PM   #3
Mini-Skoolie
 
Join Date: Jan 2009
Posts: 61
Year: 1990
Chassis: International
Engine: DT360
Re: Grounding the inverter question

Right. Most likely this should be fine as your frame should have a pretty good ground. You might want to double check that your battery is grounded fairly well to the frame, though, as an inverter will draw significantly more power then the lights that the frame is typically used to ground. At 12v a 1000 watt amp should use about 83 amps, which requires a 2 guage cable. Make sure the entire circuit from battery to inverter and back again is at least using a 2 guage cable, and that your connection points where you've screwed into the frame are clean and rust/paint free.
icnivad is offline   Reply With Quote
Old 09-10-2009, 04:07 PM   #4
Ob1
Skoolie
 
Join Date: Aug 2009
Posts: 187
Year: 1963
Coachwork: Grumman
Chassis: Chevrolet
Engine: Chevy 292 I-6
Re: Grounding the inverter question

Personally, I would cable it. No telling how well the body and frame connection points will conduct electricity. Add some corrosion to a high amperage circuit...
Ob1 is offline   Reply With Quote
Old 09-10-2009, 07:56 PM   #5
Bus Geek
 
the_experience03's Avatar
 
Join Date: Feb 2006
Location: Saint James, MN
Posts: 2,669
Send a message via MSN to the_experience03 Send a message via Yahoo to the_experience03
Re: Grounding the inverter question

For high draw circuits I prefer to ground directly to the battery. It is acceptable and normal to lose .1-.2 volts per connection so minimizing them is helpful in reducing current draw by increasing the available voltage for conversion since power (watts)=volts*amps
__________________
http://farm4.static.flickr.com/3024/...09f20d39_m.jpg
Skooling it...one state at a time...
the_experience03 is offline   Reply With Quote
Old 09-10-2009, 10:09 PM   #6
Bus Nut
 
Join Date: Mar 2009
Location: California, Just NorthEast of San Fransisco
Posts: 539
Re: Grounding the inverter question

From what little I know about cars, and from what has been said previously in the forum here, buses are no different, just bigger cars...

Isnt the frame connected to the starter battery? According to a friend who lived in his van for about two months, grounding to the van body was fine since he was using the starter battery as his power, but he would have to run a grounding line if he got a battery bank, or the bank would ground into the starter battery and cause problems...

I really dont know much about cars... So, take it as someone who knows little being worried over mole hills.
Sojakai is offline   Reply With Quote
Old 09-10-2009, 10:43 PM   #7
Ob1
Skoolie
 
Join Date: Aug 2009
Posts: 187
Year: 1963
Coachwork: Grumman
Chassis: Chevrolet
Engine: Chevy 292 I-6
Re: Grounding the inverter question

Cable it. You are gonna run a "+" cable anyways. Keep it as short as possible, and dont put the inverter in the same space as the batteries. The guys who designed the inverter also wrote the instructions and tested the systems for reliability and safety.
Ob1 is offline   Reply With Quote
Old 09-10-2009, 10:46 PM   #8
Bus Nut
 
Join Date: Mar 2009
Location: California, Just NorthEast of San Fransisco
Posts: 539
Re: Grounding the inverter question

I tend to pick up and retain odd bits of information pretty much at random... But if I want to scare people, I talk about "The Greatest American Hero". People have either never heard of it, or they remember it and feel old... I hear alot that I am "Too young to remember that show". Gotta love reruns in the late 80's...


Sorry about that, and now back to our Regularly Scheduled Topic...
Sojakai is offline   Reply With Quote
Old 09-11-2009, 10:24 AM   #9
Bus Nut
 
ezbme's Avatar
 
Join Date: Apr 2009
Location: Datil, New Mexico
Posts: 642
Year: 1989
Coachwork: Thomas Transit Liner
Chassis: Freightliner
Engine: CAT 3208 Turbo
Re: Grounding the inverter question

Thanks for all the info!
I picked up a grounding strap I am going to attach to the neg post of the battery & to steel on the bus & be done with it...
ezbme is offline   Reply With Quote
Old 09-11-2009, 10:38 PM   #10
Bus Crazy
 
Join Date: Jan 2008
Location: Upstate NY (Mohawk Valley)
Posts: 1,096
Re: Grounding the inverter question

You'd be surprised how easily a bad ground interferes with a 100-watt 2-way radio transmitter. It will really play havoc with a 1000-watt inverter. Since both 2-way radio dash units and power units are generally grounded to the body, I try and teach installers:

1. drill a fresh hole in good metal (I prefer to use a slightly undersized bit)
2. use a new sheet metal screw - #10 for a receiver, 1/4 inch for a transmitter, and
3. Always put a star-toothed washer under the head of the screw.

The factory frame-to-body straps aren't always good. My step-daughter had an old Chevy that would occasionally decide it was being hot-wired because of high resistance from a bad body strap (the battery minus was wired to the engine), so I just put a "transmitter ground" from the battery minus to the nearby fender. The electronic module became happy, and it ran fine.

Grounding to a bolt and nut will often not be a good connection, and just putting a high-current ground under an existing bolt that mounts something to the body is a recipe for trouble. This is possible even on connecting posts where there is a battery feed on another wire on the same stud. We had an '06 Freightliner stop charging because a positive stud under the frame that connected all the hot wires together stopped making connection to the alternator wire. When you have a stud connection joining two or more wires, you should probably take it apart once a year at least, clean all the terminals and hardware, and re-torque the nut(s).

Ob1 has it right. This isn't a dome light or stereo we're talking about. Mount the inverter as close to the house batteries as you can, and run the wires by the shortest safe route to the batteries. The only interruption in the wires between them should be a disconnect switch, if you use one.
__________________
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.
Redbear is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Proper house battery grounding & fusing roach711 Electrical, Charging and Solar 9 01-12-2012 10:55 AM
Question about inverter/Charger with generator Ob1 Electrical, Charging and Solar 3 12-30-2010 11:24 PM
That topic about grounding an inverter? Ob1 Electrical, Charging and Solar 3 10-07-2009 10:06 PM
an other Inverter/charger question swinada Conversion General Discussions 6 07-30-2007 03:16 PM
I was wrong about AC grounding! Chassis should be grounded Eric von Kleist Conversion General Discussions 1 09-06-2005 10:32 AM

» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 06:06 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.