View Poll Results: Pro's and con's of 12 volt generator?
Pro's(Post reason please) 0 0%
Con's(Post reason please) 0 0%
Voters: 0. You may not vote on this poll

Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-04-2008, 08:19 AM   #1
4 Rivet Member
 
1977 31' Sovereign
Manchester , New Hampshire
Join Date: May 2006
Posts: 347
Images: 33
Blog Entries: 1
Making 12 volt alternator generator..

I am thinking of removing the dometic refrigerator and putting a 12 volt generator runs off a 6 hp honda and a 100 amp car alternator . I would put a chest refrigerator runs off 120 volts I would enclose the generator sound proof it run exhaust out vent for dometic and fresh air through side access
convert to engine to run off lp gas I might later add two more batteries so I can add a inverter later . Any suggestions or conserns I should worry about?

I have the engine(off broken pressure washer) I can get a 100amp alternator with 12 volt reg on it for 100 bucks and I have the correct v pullys ..
__________________

__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer

2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
Mrcrowley is offline   Reply With Quote
Old 12-04-2008, 10:42 AM   #2
4 Rivet Member
 
1963 24' Tradewind
San Diego , California
Join Date: Jun 2008
Posts: 360
Sounds interesting! I'm not sure you could get yhe 6hp gas motor "sound proof" as many RV parks don't allow them. So it would have to be silent. Now for boondocking go for it.
__________________

__________________
Sixty3TW4US is offline   Reply With Quote
Old 12-04-2008, 11:35 AM   #3
Moderator
 
Kevin245's Avatar

 
Vintage Kin Owner
... , ...
Join Date: Jul 2007
Posts: 9,390
Images: 9
I suppose it is do-able. If it were me I'd have to be seriously motivated. My concerns would be vibration. This could not only be comfort issue to me, but a potential metal (Skin) fatigue concern in the are surrounding the generator. The other concern would be venting the exhaust fumes. I would add some redundency and not depend soley on the dometic duct work. I know it's designed to handle the flue emmisions from the fridge but this a different application with potentially higher temperatures.

Why not add an external generator? Or if you have parts already, build the unit you propose but make it a stand-alone so you could use it for tailgating or other functions.

If you proceed please take pictures and keep us in the commuications loop. We love this kind of thing!
__________________

"You wouldn't worry so much about what others think of you if you realized how seldom they do."

Eleanor Roosevelt

Kevin245 is offline   Reply With Quote
Old 12-04-2008, 11:37 AM   #4
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,193
Sounds like an expensive way to boil water. You are taking alternating current from the alternator, rectifying it to direct current, putting it in a storage battery, then inverting the direct current back to alternating current.It would be a lot less complicated to find a 120 volt generator unit, and hook that up to the engine you have, with the inverter as a backup.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 12-04-2008, 12:30 PM   #5
Rivet Master
 
easyride's Avatar
 
1977 27' Overlander
1973 27' Overlander
1963 19' Globetrotter
Naples , Florida
Join Date: Nov 2007
Posts: 1,259
Images: 1
An alternator produces ac current,but after going thru the diodes in the unit it comes out dc current.DAVE
__________________
easyride is offline   Reply With Quote
Old 12-04-2008, 12:47 PM   #6
Site Team
 
, Minnesota
Join Date: Aug 2003
Posts: 6,940
Images: 59
You need to forget about using the built in voltage regulator on the alternator. It will chew through batteries faster than an electromaggot.
__________________
markdoane is offline   Reply With Quote
Old 12-04-2008, 08:49 PM   #7
4 Rivet Member
 
1977 31' Sovereign
Manchester , New Hampshire
Join Date: May 2006
Posts: 347
Images: 33
Blog Entries: 1
Quote:
Originally Posted by markdoane View Post
You need to forget about using the built in voltage regulator on the alternator. It will chew through batteries faster than an electromaggot.
Why is that you would think if it is used in a car and it works fine how would hurt a two battery system of a trailer . It is my belief that the alternator would only operate if the voltage of the battery dropped below certain voltage . Of course if there is some other reason why it would eat up battery's please tell me before I go and blow up mine doing this.
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer

2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
Mrcrowley is offline   Reply With Quote
Old 12-04-2008, 09:02 PM   #8
4 Rivet Member
 
1977 31' Sovereign
Manchester , New Hampshire
Join Date: May 2006
Posts: 347
Images: 33
Blog Entries: 1
Quote:
Originally Posted by Kevin245 View Post
I suppose it is do-able. If it were me I'd have to be seriously motivated. My concerns would be vibration. This could not only be comfort issue to me, but a potential metal (Skin) fatigue concern in the are surrounding the generator. The other concern would be venting the exhaust fumes. I would add some redundency and not depend soley on the dometic duct work. I know it's designed to handle the flue emmisions from the fridge but this a different application with potentially higher temperatures.

Why not add an external generator? Or if you have parts already, build the unit you propose but make it a stand-alone so you could use it for tailgating or other functions.

If you proceed please take pictures and keep us in the commuications loop. We love this kind of thing!
I was thinking of routing some kind of venting from the floor where the exhaust to the vent above. I am also thinking of converting to propane not using gas . I think this would work because there is a propane line for the frig allready. as far as venting clean air to cool the engine I can route it from side door someway . I figure I can design a cover for it and have it ride on some kinda rubber matting and baffle the exhaust I bet I can make it pretty quiet remember it would not have to run at full throttle either.
Down the road I was thinking of adding a sine wave inverter maybe 4 to 5000 watts and a few more batteries. I think add some 6 volt golf cart batteries and make them parallel would be a good start but that is down the road I would not mind just having 12 volt system now since most of the trailer uses 12 volt anyway. Anyone want to help me design this ? believe me I am all up for any ideas
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer

2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
Mrcrowley is offline   Reply With Quote
Old 12-04-2008, 10:28 PM   #9
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,193
Quote:
Originally Posted by Mrcrowley View Post
Why is that you would think if it is used in a car and it works fine how would hurt a two battery system of a trailer . It is my belief that the alternator would only operate if the voltage of the battery dropped below certain voltage . Of course if there is some other reason why it would eat up battery's please tell me before I go and blow up mine doing this.
It will stop charging the battery(ies) when voltage reaches normal charging voltage, usually about 14 volts or so. This keeps a car battery charged, there should be no reason why it would overcharge the battery you are considering.
While I don't think there is anything inherently dangerous in your idea, either organically or mechanically, I do think it is unduly complex. The voltage regulator/alternator is designed to keep a battery charged, however, not charge a battery. If you use it to charge the battery, the alternator will overheat, and cause an internal failure.
__________________
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
overlander63 is offline   Reply With Quote
Old 12-04-2008, 10:39 PM   #10
Rivet Master
 
Excella CM's Avatar
 
1978 31' Excella 500
Venice , California
Join Date: May 2006
Posts: 1,061
How fast will 6hp. empty a propane tank?
__________________
"Not all who are laundering are washed" say Bill & Heidi

'78 Excella 500,"The Silver Pullit". vacuum over hydraulic disc brakes, center bath, rear twin. '67 Travelall 1200 B 4X4 WBCCI 3737
Excella CM is offline   Reply With Quote
Old 12-04-2008, 11:41 PM   #11
Rivet Master
 
2003 25' Safari
Eden Prairie , Minnesota
Join Date: Nov 2002
Posts: 765
Images: 3
Why replace an LP fridge with a 110 volt unit? Why use a 12 volt generator to charge batteries to convert back up to 110 Volts? There are too many losses in this system.

OTOH: you could leave the fridge alone, and build the generator to recharge you battery while boondocking.
__________________
Dan
dmac is offline   Reply With Quote
Old 12-05-2008, 07:44 AM   #12
4 Rivet Member
 
1977 31' Sovereign
Manchester , New Hampshire
Join Date: May 2006
Posts: 347
Images: 33
Blog Entries: 1
Quote:
Originally Posted by overlander63 View Post
It will stop charging the battery(ies) when voltage reaches normal charging voltage, usually about 14 volts or so. This keeps a car battery charged, there should be no reason why it would overcharge the battery you are considering.
While I don't think there is anything inherently dangerous in your idea, either organically or mechanically, I do think it is unduly complex. The voltage regulator/alternator is designed to keep a battery charged, however, not charge a battery. If you use it to charge the battery, the alternator will overheat, and cause an internal failure.
Well I looked up making your own generator and the site had a 50 amp alternator hooked up to a 4 hp engine with one deep cycle battery and a 4000 watt inverter and it worked great for them . So I figured a 100 amp alternator should like a car keep all the electrical going and charge batteries at the same time without any major issues . Maybe figuring out how much amp draw I get from all the lights and appliences running and then compare it to how much a (I would say a truck) draws for amps them maybe match something simular in alternator size to that .
Would that work ?
I not sure who mentioned about converting to 110 volts from the battery was
I am thinking about WHEN I do decide to make it making it a 4 battery 6 volt golf battery bank in parallel and run a 2000 watt sine inverter for the refrig only.
__________________
1976 Airstream Sovereign International Landyacht (renovating)(found DOM plate said 1976)
1968 Airstream Caravel 17 footer

2004 Nissan Titan with BT package
K/N Cool intake air
Duel power exhaust
Mrcrowley is offline   Reply With Quote
Old 12-05-2008, 07:55 AM   #13
Site Team
 
azflycaster's Avatar
 
1975 25' Tradewind
Dewey , Arizona
Join Date: Mar 2005
Posts: 12,127
Images: 62
Blog Entries: 1
Your plan is very interesting indeed. My question is why? Propane refrigerators work great. They run for ever on a small amount of propane, have no moving parts and make no noise. Just courious...
__________________

Richard

Wally Byam Airstream Club 7513
azflycaster is offline   Reply With Quote
Old 12-05-2008, 12:43 PM   #14
Liberator
 
klattu's Avatar
 
1972 Argosy 24
1989 34.5' Airstream 345
Heart of Dixie , Alabama
Join Date: Sep 2006
Posts: 1,646
Images: 834
I am very happy with my gas/12v fridge....

Now what we need is a freon compressor that ties directly to a small gas engine...
a miniture version of the AC unit on your truck.
it could have electric start so it does not idle between compressor cycles.
Engine would only need to be about 1/2 hp for a small fridge.

I think a trip to the patent office is in order.
__________________

__________________
Your opinion is valued, please not your opinion of someones else's opinion.
Click To See Me Wet
1989 Airstream 345 Liberator...
1972 Argosy 24'...
1954 Feathercraft Vagabond
klattu is offline   Reply With Quote
Reply

Tags
12 volt


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
HELP with alternator dorothywhitt Mechanics Corner - Engines, Transmission & More... 1 07-11-2006 01:44 PM
Proper Alternator?? GlenCoombe Mechanics Corner - Engines, Transmission & More... 16 09-23-2005 12:39 AM
6 volt vs 12 volt brakes? lwebb Brakes & Brake Controllers 17 07-14-2005 09:32 AM
Wiring Sequence to hook up 2 x 6 volt battery pack to your 12 volt trailer battery TobyJH Batteries, Univolts, Converters & Inverters 0 05-21-2004 01:04 AM
1961 - 12 volt or 6 volt? Marlboro Mafia Electrical - Systems, Generators, Batteries & Solar 4 04-19-2004 10:03 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 11:12 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.