Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-09-2010, 10:54 AM   #1
Junior Member
 
Join Date: Aug 2008
Posts: 29
running 120v invertor plugs off a generator

Hope this makes sense !! Coming off the invertor, there are four plugs in various locations to power the rear & front tv and two other plugs in various locations.. My question is, I want to backfeed one of the plugs (which will energize the other three) from a portable 1000w honda generator to watch tv without draining the batteries.. My question is, being the wiring of these four plugs goes back into the invertor, could damage be caused to the invertor being voltage is being applied INTO the invertor from reverse order or is there a diode that prevents damage if voltage is applied backwards into the invertor.. May need to contact the invertor mfg., but just thought someone has tried this before.. When dry camping we use the tv's alot and seem to drain the batteries due to the fact I would rather not run the big generator all the time...Thanks
__________________

__________________
trophylite is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-09-2010, 11:11 AM   #2
Senior Member
 
Join Date: Apr 2009
Location: Leonard, TX
Posts: 127
I'd contact the manufacturer, but this doesn't sound like a great idea unless you can get to the wire feeding those plugs form the inverter and install a switch or, better yet, a NC relay that is activated by the socket you put the external generator output to (so it disconnects the inverter on sensing the power). Note that this may well exist already if you have provision for an external AC input, but then you would not have asked the question?
Ernie
__________________

__________________
Ernie n Tara

Remember! Life is not a rehearsal!
Ernie n Tara is offline   Reply With Quote
Old 09-09-2010, 11:29 AM   #3
Junior Member
 
Join Date: Aug 2008
Posts: 29
Quote:
Originally Posted by Ernie n Tara View Post
I'd contact the manufacturer, but this doesn't sound like a great idea unless you can get to the wire feeding those plugs form the inverter and install a switch or, better yet, a NC relay that is activated by the socket you put the external generator output to (so it disconnects the inverter on sensing the power). Note that this may well exist already if you have provision for an external AC input, but then you would not have asked the question?
Ernie

Yea that's what I was thinking...Would be so much easier if I could just plug it into the shore power, but it tries to energize the invertor, refer, and alot of other charging accessories that overload that little 1000w Honda..All i want to do is energize the 4 plugs.. Maybe someone else on here knows something about how the invertor works...Thanks for your info
__________________
trophylite is offline   Reply With Quote
Old 09-09-2010, 11:52 AM   #4
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
trophylite,
You pose an interesting question ...and it is very sensibly stated.
Agreed, it is more sensible to utilize the smaller, quieter, more efficiently rated portable generator to power the TVs.
...And, your rationale for wanting to "backfeed" is arguably defensible up to a point. That point is "convenience" ... and it is always trumped by "SAFETY".
It is NEVER a good idea to 'backfeed" any circuit. The "live" end of the backfeed cord itself is a hazard. Add to that, you now have an inverter in play in the RV aalication.
You are wise to ask "what will happen?" I haven't a clue.

I DO know that when "backfeed" voltage goes upline and hits a stepdown power transformer, the reverse happens and the backfeed voltage is STEPPED-UP ...and can go for great distances in the utility power grid.
That is why linemen will not touch their utility lines in a storm restoration operation if they hear a generator running.

As to the theoretical question you pose regarding the inverter...
One of the members of iRV2 uses as his "motto" the following:

"In theory, there is no difference between theory and practice, but in practice, there is."
Graham Gracie

Bear in mind that you may get a lot of answers... most of them will be "theroetical" and there are many variables, i.e.;
...what if you forget to unplug your "jerry-rigged" backfeed patch cord and tie in to shore power?... Now, you have 110 going into your generator control backwards. Even if it is not runnng, no good can come of that. If it IS running ...it won't be pretty.

Yes, I know... YOU would never, ever do that. BUT...

May I humbly suggest that for the sake of SAFETY, and to be sure that no one else ever gets hurt ...you simply use a properly rated extension cord ...or perhaps get fancy and install a line orginating at the locaton of the portable generator and terminating at a set of "dedicated" outlets at each TV location.

You are going to have to set-up and crank the portable generator anyway, so plugging in a 110 extension cord OR dedicated line is a very small concession for the sake of SAFETY.
Thanks for considering this,
Jim
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 09-09-2010, 12:35 PM   #5
Junior Member
 
Join Date: Aug 2008
Posts: 29
Jim, Thanks for the good info and I fully agree with you on the aspect of safety... I am a high voltage lineman for SCE and it sounds like you are either a lineman also or have extensive electrical theory background.. I would love to just have some dedicated plugs coming from the 1000, but would be a major job fishing new wire up walls, etc. and would have to tear half the coach apart.. Just trying to fiqure out an easy way to do it... I may give the invertor mfg. a call and see if there is possibly a fail safe remedy inside the invertor... I will post if I find something out...Thanks
__________________
trophylite is offline   Reply With Quote
Old 09-09-2010, 12:45 PM   #6
Senior Member
 
Country Coach Owners Club
Vintage RV Owners Club
Florida Cooters Club
Join Date: Aug 2010
Location: Central Florida
Posts: 337
Quote:
Originally Posted by trophylite View Post
Jim, Thanks for the good info and I fully agree with you on the aspect of safety... I am a high voltage lineman for SCE and it sounds like you are either a lineman also or have extensive electrical theory background.. I would love to just have some dedicated plugs coming from the 1000, but would be a major job fishing new wire up walls, etc. and would have to tear half the coach apart.. Just trying to fiqure out an easy way to do it... I may give the invertor mfg. a call and see if there is possibly a fail safe remedy inside the invertor... I will post if I find something out...Thanks
trophylite,
Man I gotta tell you that I feel 100% better knowing that you are a lineman! Sorry if I was "preaching to the choir"... but one never knows the level of awareness/knowledge/skills at hand with the OP.
You will find a good and SAFE way to do this, I am sure.
It's all good (...It's even BETTER, now!),
Jim
__________________
Jim and Fran in Central Florida
1989 Country Coach Sedona Mark V
Turbocharged Detroit Diesel 8.2L "Fuel Pincher"
Good man is offline   Reply With Quote
Old 09-09-2010, 12:55 PM   #7
Senior Member
 
DP01's Avatar
 
Monaco Owners Club
Join Date: Feb 2007
Location: Southern. Ontario
Posts: 149
This may seem like a stupid suggestion.

Would you not be better served by simply connecting the Honda generator to the shore power plug using a 30A-15A or 50A -15A dogbone? Turn the inverter off and the entire RV AC system will be fed from the Honda. No backfeeding - no problems

Dennis
__________________
2009 HR Neptune PBQ
DP01 is offline   Reply With Quote
Old 09-09-2010, 02:28 PM   #8
Senior Member
 
Join Date: May 2007
Posts: 632
Quote:
It is NEVER a good idea to 'backfeed" any circuit. The "live" end of the backfeed cord itself is a hazard.
Ditto!

What you can often do is to use the circuit breakers to isolate selected circuits. Make it so the selected outlets are on their own separate circuit breakers. When you want to feed those, and only those, shut off all the other circuit breakers when you run off the genset.
__________________
BryanL is offline   Reply With Quote
Old 09-09-2010, 05:03 PM   #9
Senior Member


 
Join Date: Nov 2009
Location: Big Bear Ca.(Sugarloaf)
Posts: 1,223
Quote:
Originally Posted by BryanL View Post
Ditto!

What you can often do is to use the circuit breakers to isolate selected circuits. Make it so the selected outlets are on their own separate circuit breakers. When you want to feed those, and only those, shut off all the other circuit breakers when you run off the genset.
That's what I was thinking. Seems alot easier.
__________________
Mark & Carole
What a long strange trip it's been.

No longer RVing. Happy Trails to you.
Campingman is offline   Reply With Quote
Old 09-09-2010, 06:03 PM   #10
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 22,799
NEVER, EVER NEVER backfeed a outlet NEVER, This is very dangerous.. I do however have a very simple option you might find interesting.

Where the 120 vac line comes out of the generator, Cut the wire, add a plug (Twist lock type is best here) and matching outlet.. The outlet goes to the Inverter, the plug to the down-line outlets.

Now, feed the plug, using the proper cord, off the generator.. No danger.
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 09-09-2010, 06:05 PM   #11
Senior Member
 
tquarles's Avatar
 
Monaco Owners Club
Join Date: Nov 2007
Posts: 145
Well, since most inverters if not turned on to invert just pass their input to the outputs, in your case, they'd pass the outputs back to the inputs, backfeeding your entire electrical system with the effects of:
1: tripping out your generator just as if you'd plugged the shore power cord into it.
2: Making the plug on the end of your shore power cord LIVE in the time before the generator shuts off.

I wouldn't want either of these things to happen. If you happened to plug into shore power (or did this during a blackout) you could be backfeeding to the utility lines and frying a lineman.....

I'd go for turning off most of the breakers and plugging the shore power cord into the generator. It should do what you want without the bad side effects.
__________________
2002 HR Endeavor
tquarles is offline   Reply With Quote
Old 09-09-2010, 07:49 PM   #12
Senior Member
 
Rich and Cork's Avatar
 
Join Date: Jan 2006
Posts: 1,052
Not sure why you don't just plug your shore power plug into the Honda?

I have a Honda 1000 also, but my present motorhome draws too much and it will kick off the Honda. So, if that is also your problem, use the 12v connector that came with the generator and connect to your batteries and just use the inverter off the batteries. My previous motorhome (a Winnebago) would run fine on the Honda using the shore power plug.

Good luck and have fun.
__________________
2001 34' Alpine Coach
2008 Jeep Rubicon or 2012 Ford F150 4x4 Lariat towds
or a couple of different trailers
Retired in Apple Valley, California
Rich and Cork is online now   Reply With Quote
Old 09-09-2010, 11:02 PM   #13
Senior Member
 
PlayItForwrd's Avatar
 
Tiffin Owners Club
Join Date: Feb 2010
Posts: 312
I have to echo the 'plug it into the shorepower input" crowd. Virtually everything you DON'T want powered can be turned off, either at the unit itself or at the breaker box.

Make sure you switch the fridge from "auto" (or "elec") to "gas", the fridge alone will eat half your generator's output...
__________________
2000 40' Tiffin Allegro Bus \ 2003 Chaparral 260 SSI
1988 53 x 14 Skipperliner \ 1995 32' Party Cruiser
1984 Goldwing Aspencade \ 1976 Harley Sportster
PlayItForwrd is offline   Reply With Quote
Old 09-10-2010, 09:09 AM   #14
Senior Member
 
Join Date: Nov 2007
Location: somewhere in the west
Posts: 1,168
Plug in a regular battery charger to the Honda and run off the battery/inverter This way you get TV and a full battery! A real battery charger is better than the Honda 12 volt hookup because a charger requires fewer RPM's from the Honda. Ed
__________________

__________________
Ed-Sommers is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Generator not starting unless V-10 engine is running bobpie Winnebago Industries Owner's Forum 11 08-12-2010 06:59 PM
Generator running electrical outlets dmason Monaco Owner's Forum 4 03-01-2010 07:26 PM
running propane heater / ec 30 auto generator starter peter griffin Winnebago Industries Owner's Forum 31 01-13-2007 03:52 AM
generator running, no power to coach.... TacBear MH-General Discussions & Problems 4 10-22-2006 09:01 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:29 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.