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07-21-2016, 12:33 AM
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#1
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3 Rivet Member
2011 27 FB International
Vancouver
, British Columbia
Join Date: Aug 2014
Posts: 228
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passing thought...propane 12v generator?
I've an empty battery box since I converted to lithium (and placed under the bed). It occured to me that it could be interesting to fit a 12 volt propane generator into the battery box. Its sole purpose to charge the batteries. The old battery cables are still there. The box of course is next to the propane.
Has anyone considered/looked into/implemented this?
It's really just a passing thought. Between my new solar panels and the lithium, I'm not certain I would ever actually need a generator.
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07-21-2016, 06:15 PM
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#2
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Rivet Master
1974 Argosy 26
Morrill
, Nebraska
Join Date: Nov 2009
Posts: 6,014
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I doubt your generator will have any kind of regulator on the DC output. You could cook your battery with out some way to determine what the charge level.
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07-21-2016, 07:36 PM
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#3
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4 Rivet Member
2015 28' Flying Cloud
Newtown
, Pennsylvania
Join Date: Jan 2015
Posts: 316
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Are 12 volt DC generators even available? I've seen some redneck contraptions on utube.
Bruce
__________________
50 amp, Awning package
2015 Ram 2500 6.7 TD, Blue Ox 1000 lb.
400ah LiFePo4, 800 watts solar, 2x eu2000i Propane
PD9160 converter, Prosine 1800 inverter
2x Victron 100/30 Smart Solar, Victron Smart Shunt
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07-21-2016, 07:57 PM
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#4
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Rivet Master
2006 23' Safari SE
Biloxi
, Mississippi
Join Date: Nov 2011
Posts: 8,278
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Quote:
Originally Posted by AstroBruce
Are 12 volt DC generators even available? I've seen some redneck contraptions on utube.
Bruce
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Yes. Most have direct output 12 volt DC outlets. My Yamaha came with a 12 volt cable that plugs into the generator and has clips to attach directly to a battery. Check the manufacturer web sites for further information.
__________________
MICHAEL
Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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07-22-2016, 12:15 PM
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#5
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4 Rivet Member
2015 28' Flying Cloud
Newtown
, Pennsylvania
Join Date: Jan 2015
Posts: 316
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Quote:
Originally Posted by AWCHIEF
Yes. Most have direct output 12 volt DC outlets. My Yamaha came with a 12 volt cable that plugs into the generator and has clips to attach directly to a battery. Check the manufacturer web sites for further information.
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Yeh, I get that. My 2 Honda eu2000i's Have the DC outlet. Will take about 2 days to charge my batteries at 8.3 amps.
I guess I misunderstood the OP.
Bruce
__________________
50 amp, Awning package
2015 Ram 2500 6.7 TD, Blue Ox 1000 lb.
400ah LiFePo4, 800 watts solar, 2x eu2000i Propane
PD9160 converter, Prosine 1800 inverter
2x Victron 100/30 Smart Solar, Victron Smart Shunt
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07-22-2016, 12:50 PM
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#6
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Wise Elder
2010 30' Classic
Vintage Kin Owner
South of the river
, Minnesota
Join Date: Dec 2009
Posts: 4,169
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There isn't much available in propane 12v generators. Let's take a look at what's been available, now and then.
1) In the 1960s Airstream had a propane 12v generator as an option. There are some surviving examples, but it was loud, unreliable, and had low output current. I believe it installed in one of the baggage compartments.
2) As noted upthread the battery charging outputs of various 120v generators could be used. These use gasoline engines, but propane conversions are readily available. In general, again as noted upthread, the power output is extremely modest.
3) It is possible to assemble something using an automotive alternator and a gasoline engine (converted to propane) connected by a belt. The belt drive is necessary because automotive alternators require a fairly high shaft speed to produce much output.
4) There are some commercially available 12v generators that appear to be made up of an automotive alternator, a small gasoline engine, and a gear drive. This reduces size compared to a belt. Prices start at over $1,000. http://www.altendc.com/g1-gasoline-b...g-dc-generator
5) In the recent past there were permanent-magnet 12vdc generators available that used a large diameter, balanced rotor that was bolted to the crankshaft. They were mainly sold for marine use. I can't find any for sale now. By memory, they were fairly reasonably priced and had output of around 50-100 amps.
All of these are large. PV panels have come down in price so much that, today, I'd opt for solar panels first.
__________________
To learn to see below the surface, you must adjust your altitude
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07-23-2016, 10:24 AM
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#7
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3 Rivet Member
1958 22' Caravanner
Plattsmouth
, Nebraska
Join Date: Oct 2014
Posts: 166
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mixedpuppy: I eliminated the need for house batteries in my 1958 Caravanner total gut and redesign. On the "A" frame I mounted a 3500 watt, 142 pound, gas/propane electric start generator. I keep a full 20 pounder to refill my 20 each 1 pound propane point source bottles. All transported in the cargo bed of my Escalade EXT. Thus I have the option of using the 20 pounder resting on the ground , or for short duration operation on a 1 pounder, or gasoline if I so choose. Likely this will not work for you as you must power a pump, lights, fans, possible frig, TVs and sound systems. etc for longer durations. However, my generator set up will recharge batteries ( up to 20 amp max ), it's own small starter battery, and constant 12 volts while running.
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07-23-2016, 12:40 PM
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#8
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2 Rivet Member
2011 27' FB Flying Cloud
Delmar
, New York
Join Date: Aug 2013
Posts: 40
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Jammer left out option #6 - the often promised fuel cell.
Ran across this site the other day. No price given and we all know what that means.
http://www.wattfuelcell.com/portable...watt-imperium/
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08-22-2016, 12:15 PM
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#9
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Rivet Master
2008 22' Safari
Spicewood (W of Austin)
, Texas
Join Date: Mar 2015
Posts: 2,987
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An excersize bike connected to an ordinary Delco automotive alternator will do this job PLUS keep the wife trim-and-firm.
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08-22-2016, 12:24 PM
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#10
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Rivet Master
1977 23' Safari
Niagara on the Lake
, Ontario
Join Date: Aug 2011
Posts: 984
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I had a Honda EM500 generator.
We called it the lunch box,
It was small and quiet and had a 12v plug.
I'm sure it could be converted to run on propane and mounted on the tongue behind the propane tanks.
__________________
1977 Safari Land Yacht
2005 Toyota Tundra SR5
2022 Toyota 4Runner SR5
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08-22-2016, 07:13 PM
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#11
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4 Rivet Member
2015 27' FB International
Howard
, Ohio
Join Date: Dec 2014
Posts: 267
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Quote:
Originally Posted by kenen42
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You had to post it didn't you.......😳. I'm going to have to ask the supplier how much now.......I can't help myself........
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08-22-2016, 08:09 PM
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#12
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Rivet Master
1974 31' Sovereign
1979 23' Safari
Wayland
, New York
Join Date: Jan 2012
Posts: 1,632
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I think you could fit a 2000w generator up there. Seems like a good idea actually. For the charging though, you'd be better off plugging your 30a cord into the generator with a 15a adapter and letting your converter charge the batteries.
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09-12-2016, 07:40 PM
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#13
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4 Rivet Member
2015 27' FB International
Howard
, Ohio
Join Date: Dec 2014
Posts: 267
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passing thought...propane 12v generator?
Quote:
Originally Posted by kenen42
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The supplier contacted me with the cost, wait for it........$10k to $15k. I know you will all be lined up to buy one maybe two of these but you will have to wait until mid 2017. They are not on sale yet.
Must admit this is probably an almost ideal system when combined with a big battery and solar (if you ignore the cost). It puts out 1000w, runs off propane, weighs 28lbs, is 60% efficient and can apparently heat water also. It can run almost silently as required. It generates CO2 and pure fresh water (top off your fresh water tank...?) as waste products. Maybe in 15 or 20 years they will replace hydronic heating, water heaters and gas powered generators for the serious boondocker. Who knows....
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11-30-2021, 09:28 PM
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#14
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New Member
Lake Arthur
, Louisiana
Join Date: Nov 2021
Posts: 1
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This came out of a 1973 Avion La Grande 31 I picked up as a restoration project.
It's a 12VDC generator that puts out 30AMPS. It runs off of propane.
Unfortunately there is no tags or information on it but that is definitely ONAN green. It still works beautifully.
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12-01-2021, 05:23 AM
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#15
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Site Team
1994 25' Excella
Waukesha
, Wisconsin
Join Date: Sep 2020
Posts: 5,581
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If you don't already have solar on the roof, an option is to just add a few panels up there and let them help keep your batteries topped off.
__________________
Richard
11018
1994 Excella 25 Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8
1974 GMC 4108a - Custom Coach Land Cruiser (Sold)
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12-01-2021, 05:51 AM
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#16
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Rivet Master
2016 16' Sport
Miami
, Florida
Join Date: Aug 2016
Posts: 1,596
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Quote:
Originally Posted by Boxite
An excersize bike connected to an ordinary Delco automotive alternator will do this job PLUS keep the wife trim-and-firm.
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Even better, get an electric assist exercise one to make it easier on the wife.
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