Has anyone else done this ? Are there any drawbacks to operating it as
mentioned above ? Seems like a good way to conserve on the Propane
while on the road , no ?
Thanks.
Actually it is drawing more than that because it is not 100% efficent.
My guess is that it is 21 to 23 amps.
--
-----------------
www.thesnoman.com
>Dave in Lake Villa wrote:
>>
>> Has anyone else done this ? Are there any drawbacks to operating it as
>> mentioned above ? Seems like a good way to conserve on the Propane
>> while on the road , no ?
>>
>
>
>Actually it is drawing more than that because it is not 100% efficent.
>My guess is that it is 21 to 23 amps.
And my guess would be that the engine alternator is not replacing as
much as you're drawing out.
Jon
====================================================
Jon Griffin
SKP 75680 FMCA F257439
Pahrump, NV Sundre, AB
apply ROT13 to my address
V...@eniatvqvbgf.arg
====================================================
Ain't no free lunch...
Rick
Dave in Lake Villa wrote:
I've been doing that for several years, but only with the engine running.
Comes on automatically 6 seconds after the ignition is turned on. By that
time the engine is running. The alternator appears to have no problems with
the load and I don't have to bother shutting the fridge down from propane
when gassing up, nor worry about the flame blowing out during travel.
Paul
Since it does not work well on 12 volts I would take a look at the 12 volt
wiring. Measure the voltage at the battery and at the Frig. to determine
voltage drop. Maybe just a matter of using more or larger wires.
>
> Since it does not work well on 12 volts I would take a look at the
> 12 volt
> wiring.
None of the 3 way RV frigs worked well on 12 volt. The reason for
their demise!!
Tom J
who killed the 12 volt section in a new one the day I took delivery in
1986
They work ok on little ones, maybe up to 2 cu. ft. They still use them in
pop-ups. However, a 6 cu. ft. would take a pretty big heater. It would
be interesting to find out what kind of current it draws. The little ones
draw about 10 amperes.
I really don't see any reason they would not work if they have a high
wattage. But it would need some pretty big wire all the way from the
generator.
Reply: Glad to find someone else whos doing it. I cant imagine the
engines alternator being taxed since mine is rated at 130 amps. I
figure when i go into a restaurant, ill just kill the Inverter ... and
only use it when the engine is on.
About 170 watts. At 13 volts an equivalent heater would need about 13
amperes. Not bad either but would need some heavy wire.
Can you tell me how you configured it to do that? What size wire do you have
feeding the trailer connection? And where does that wire start? All the way
in the front of the vehicle, at the alternator? Or farther back?
TIA
--
Chris Cowles
Gainesville, FL
Chris Cowles wrote:
I'll try to explain, but if you want, I can make up a schematic and send it to
you.
My fridge gets 115 VAC from an outlet in the back, and the power to it now comes
from the common side of a fairly heavy duty DPDT relay ( I happened to have a
Potter Brumfield 19238 on hand). NO side is fed from campground or genset
power, i.e. the wires that used to go to the outlet. NC side is fed from the
inverter. The relay is energized when campground power is present.
I was lucky because my genset is very close to where I mounted the inverter,
which is very close to the fridge. I ran the wire from the genset starter wire
connection to the contacts of a continuous duty solenoid. The solenoid gets
energized by the MH ignition. I wired in variable a timer to give the engine a
few seconds, even though I don't think it's really necessary.
I'm not doing it for economy reasons. Running the fridge takes energy of some
sort, gasoline, propane, campground power, whatever. I'm not expecting to get a
free ride, in fact I realize that there is a net loss, with the inefficiency of
the inverter and energizing the solenoid. I did it for the convenience of not
having to do anything special when gassing up, not having to worry about the
wind blowing out the flame (actually never did have that happen, but wouldn't
say that it can't) plus not using any propane unnecessarily. I know it doesn't
take all that much propane to run the fridge, but one of the problems of
built-in tanks is that you usually have to break camp in order to get it
refilled, so I try to conserve as much as I can. I do use an auxiliary bottle
when we stay anyplace for any length of time.
One word of caution. You may have an alternator rated by the manufacturer at
130 amps. If it could produce that for any lentgh of time, you'd be able to use
it as a welder. One look at the alternator will show you that there is no way
any of the wiring there would be able to take that kind of current for any more
than a brief moment, if at all. It's like Sears telling you that their vacuum
or table saw is 3 horsepower. Yeah, right!!
Paul
Reply: I ran #6 THHN wire on the 12vdc side. Runs for 9' from the Coach
Battery.
REPLY: Chris, Actually, i didnt write the above..the other Poster did.
Id also like to know how he got the 6 second time delay . What i did
on mine is : I used a Transfer Switch so the fridge will operate on 110
v. shore power when at a CG , and, on the Inverter when im on the Road.
I have a manual switch inside the RV on the control panel that makes and
breaks the Inverters on/off switch (12v circuit) for when i go into a
restaurant....but, id like to tie it into the engine so it kills the
Inverter when the engine shuts off ; a simple 12v Relay in series with
the Inverters on/off switch would do the job...but i like the idea of
the time delay on re-start.
This is a little overkill for that short of a run. Even 10 gauge would
only drop about .1 volts on that run at the load
-----------------
www.thesnoman.com
>
> Since it does not work well on 12 volts I would take a look at the 12 volt
> wiring. Measure the voltage at the battery and at the Frig. to determine
> voltage drop. Maybe just a matter of using more or larger wires.
>
>
If you look at the spec you will most likely find the 12V heating
element is smaller than the 110V unit. 12V usage is intended as a
"limp home" function that can hold you over until you can get to
either a 110V source or propane station. It is NOT intended to be a
primary energy source.
Mickey
Mickey
REPLY: This isnt the only load i have on the Inverter ; plus, id
rather go overkill ; wire is cheap enough.
> This isnt the only load i have on the Inverter ; plus, id
> rather go overkill ; wire is cheap enough.
>
I understand that this may be so but even at 30 amps, the drop would be
about .3 of a volt. I would use 6 or 8 if it was a 20 or 30 foot run but
for 9 feet I would not bother going over 10 ga for up to 30 amps or so.
Smaller wire is easier to route and hide when need be and turn sharper
corners too.
-----------------
www.thesnoman.com
Did you run the same wire for the return or use the chassis?
I assumed?
<Did you run the same wire for the return or use the chassis?'>
REPLY: I ran #6 return back to the battery. Not the chassis.
>None of the 3 way RV frigs worked well on 12 volt. The reason for
>their demise!!
>
>Tom J
>who killed the 12 volt section in a new one the day I took delivery in
>1986
I don't understand this.
In my '95 Class B I have a Dometic RM2310. It has always worked
extremely well on all three modes. I always use 12v while driving.
Yesterday, for example, with ambient temperatures in the 70s or higher,
the freezer temperature hovered around -20 and the refrigerator +25.
I like my iced tea VERY cold....
GB in NC
Many reasons were stated about the 12 VDC heating rod, Ground wire
not large enough, power wire to small, system not grounded
adequately, to much draw on the battery, on and on and on. Point is
the DC system was actually not needed with gas being the best part
of the system. When AC was available that heating rod was able to
produce more heat than the DC system had. I think the wattage of the
DC heat rod was less than the AC rod. Some systems did not produce
an adequate constant amount of DC power to run the ref on it.
Consequently, eventually the batteries were drawn down.
--
BILL P.
Just Dog
&
ME
Several years ago I had a TT with a 3way, always had problems with
the DC part. I contacted Dometic Co. they indicated the DC was never
able to sustain a very large ref. it would help in the event you ran
out of LP or had to go through a tunnel where open flame items could
not be used. Their reasoning was because of the small battery banks
and low output converters in most RVs long with the tow rig low
output on the accessory connection.
The new rig I have now has the Dometic model RM2652, two way, But
the controlling voltage is 12 VDC at 3amps, the heater is AC at 5amp
There is an auto setting that allows it to run on shore power until
disconnected and then over to gas automatically.
This thread has brought up one learned lesson of interest. If you
are running off of one gen set like I do some times. You would want
the frig set on gas only so as to not overload the gen set when it
kicked in to electric. Learned that about the dual water heater
tanks also, better turn the AC bolt off, run it on gas only as well,
unless you are running a full size gen set, or as in my case
paralleled EU2000i gen sets.
I question that 12 VDC at 3 amps. (36 Watts!!). I would suspect it would
be more like 300 milli-amps or less or more likely 30 ma.. Maybe the 3 a is
a peak thing.
And it would run fine on AC with a 1KW generator if that is all you have
loaded on it. Load about 600 Watts. Bit not for refrig., Water Heater, TV
and a bunch of other stuff all at the same time.
I Agree, I was glancing over the material with brain disengaged
Those values were the fuses. The heater is 325watt, 120Vac. There
are other components that will draw power more than one would know,
using the booklet they provided. Such as the heat tape for climant
control feature. I cannot find what the total power requirements are
for this new frig, maybe because it is made in Sweden, thank god
that didn't say China. At that rate the 700watt inverter would be
able to run this one. But when boondocking it will run on gas,
because as you indicated there are other things that will be
operating. I intend on installing 2/gp27 batteries and a 1000watt
inverter.
http://bart.ccis.com/home/mnemeth/12volt/12volt.htm
I am using information derived from the above link.
--
BILL P.
I have had a 3-way refrigerator in my motorhome for the last 13 years. It
cools well on 12 Volts. It probably doesn't cool as well as it does on 120
Volts or LP gas, but it does a good job of keeping the refrigerator cold
once it has been cooled by either the 120 Volt or LP gas sources.
The most likely reason for the demise of 3-way refrigerators is that
inverters have become so inexpensive and common that there is relatively
little need for 3-way refrigerators any more.
--
D.J., N8DO; FMCA 147762
dj[underscore]osborn at yahoo dot com
> > operating. I intend on installing 2/gp27 batteries and a 1000watt
> inverter.
> http://bart.ccis.com/home/mnemeth/12volt/12volt.htm
>
> I am using information derived from the above link.
I can't get any of his sites to work. Is there a browser setting trick I am
missing? Anyway, AFAIK, you are not supposed to draw more than 1/4 of your
battery bank's amp/hr rating at a time nor charge it with more amps than
that. Ignoring power factors etc to make the math easy, I believe this
means not drawing more than 50 amps from a 200 amp/hr battery bank at a
time. A 1000 watt invertor (ignore etc) could draw 1000/12 = 83 DC amps.
So the two 27s together would need to be 4X83=332 amp/hr if the inverter is
loaded up.
ISTR an example in a RV book based on all this that you need ~225 amp/hr
bank for a 600 watt inverter loaded up. I am guessing you actually need
four (two pairs) of those 27s to go with your 1000 watt invertor, once you
do the real math with the power factors etc. Or maybe I misunderstood how
this works?
Regards,
Barry
> ...
> I like my iced tea VERY cold....
>
> GB in NC
Is there any ohter way???
Mickey
Probably a couple other items. First of course it is cheaper to eliminate
the 12 volt. The other being that most vehicles are not adequately wired to
handle the necessary current. The manufacturers perhaps went to lower
wattage 12 volt heaters because of that.
I had a small refrigerator in a HI-LO. Ran it on 12 volts all the time but
not before making a lot of measurements that convinced me that I could run
it without drawing on the trailer battery. That refrig. did not light
automatically so if it were run on propane and the flame blew out it would
not light again.
Now of course with my bigger two way I run on propane when driving.
With the HI-LO a dead battery was a disaster. It uses an automobile starter
motor to drive the hydraulic pump to lift the top.
Another HI-LO owner problem I found common was their having a fuse instead
of an auto reset breaker in the 12 volt line from the tow vehicle. They
would operate the lift motor and blow the fuse. Then they would go on their
way with the refrig. on 12 volts. The trailer battery would be dead by the
time they got to where they were going.
Don't know about your way, but you don't want to know about the other way.
Trust me.
--
Jon
JPinOH
You are probably correct but you start at a starting point and never
stair step the inverters it would cost you a mint. Considering the
inverter in question will be a true sign wave unit. My original
thoughts were to have one about 700amp, but got criticized on it
being to small.
Here is some information contained in the link you cannot open.
----------------------------------------------------------------------
You begin to see that putting in a larger inverter to run bigger
loads will require you to have an appropriately sized battery bank
and an adequate method for recharging it! You can't hook a 2000 watt
inverter to a single battery and cook the Thanksgiving turkey in the
microwave! You should get a feel for your intended inverter usage
and take into account the size of your battery bank before selecting
an inverter. In my personal case, I chose a 750 watt inverter to go
with my 2 battery bank. I didn't have room or weight capacity for
more batteries, so I went with a smaller inverter. It runs all my
electronics, charges power tools, runs kitchen tools, but won't
support my microwave or toaster oven. It was a good compromise for
my situation. It was also a lot cheaper, as my inverter was about
$500, compared to the $900+ that I would have paid out for a 1500
watt unit. And that brings us to the next topic:
---------------------------------------------------------------------
Some advice from others ran me up to 1000watt inverter, I consider
it would be ok as long as I thought I could eventually expand my
battery bank, of which I have the room. When it comes to buying, or
better said spending the money I might drop back down, infact a
500watt would do me as I can see it.
--
BILL P
.> > ISTR an example in a RV book based on all this that you need ~225
amp/hr
> > bank for a 600 watt inverter loaded up. I am guessing you actually need
> > four (two pairs) of those 27s to go with your 1000 watt invertor, once
you
> > do the real math with the power factors etc. Or maybe I misunderstood
how
> > this works?
snipped some
> Here is some information contained in the link you cannot open.
> ----------------------------------------------------------------------
> You begin to see that putting in a larger inverter to run bigger
> loads will require you to have an appropriately sized battery bank
snipped
> ---------------------------------------------------------------------
> Some advice from others ran me up to 1000watt inverter, I consider
> it would be ok as long as I thought I could eventually expand my
> battery bank, of which I have the room. When it comes to buying, or
> better said spending the money I might drop back down, infact a
> 500watt would do me as I can see it.
Makes sense to me. I think it is the "continuous watts" rating that matters
(less than 1000) and of course you don't have to load it right up. If you
know your bank's amp/hrs , you can work out your wattage limit to not exceed
the 1/4 draw. BTW I should not have said "two pairs" of 27s-got mixed up
with pairing golf-cart batteries, sorry.
Regards,
Barry
> Now of course with my bigger two way I run on propane when driving.
Yipes! Legal some places and illegal (most?) others, crazy always! eg,
driving past another vehicle leaking gasoline, passing an accident scene
where gasoline has spilled on the road, waiting your turn at the gas pump,
etc, etc.
Regards,
Barry
You are kidding? Legal most everywhere. Illegal in a couple underwater
tunnels in the east. I will guess that 90% or more RV run with their
refrigerators operating on propane.
This has been discussed here a thousand times. An often posted request is
to show one case of a fire due to a refrigerator running on propane. I have
not seen one yet. There was an RV fire in Frisco, CO a few years ago where
a gasoline pump did not turn off. The guy pulled out the hose and squirted
the gas around but even that one the refrigerator has been eliminated as the
cause of the fire. Burned down the whole place.
You're right.
Every day I read several news reports of explosions in exactly those
situations, caused by RVers who use their propane appliances while
driving. We've got a reputation for blowing up stuff everywhere we go.
In fact, it happens so often that it's a wonder all RVs haven't been
banned from the nation's highways. I expect that will happen any day
now.
We just can't afford all this carnage. Oh, the humanity....
(Oh, wait -- were you serious?)
GB in NC
If you would just think of it. The modern RVs are produced with no
DC heater in the frig. How do you expect they want you to keep it
cold, on the road, a block of ice! No! Just keep it on propane with
a very few exceptions. However there is a WARNING posted in my
owners book that you should shut off all LP gas appliances which are
vented to the outside. That includes the one in my 5er, then I use
diesel so I don't think I have to worry about it.
--
Bill P.
just
Dog
&
ME
At this time in life all that
remains is left overs, some can
be cherished as good others bad,
but the only definite is that they
are all that remains, main course is
over.
Ok, everybody does it and nobody died! I guess the right answer is if you
don't really need to, don't , but if you do , go ahead.
Regards,
Barry
Your imagination is more dangerous than reality in this case. None of that
has happened yet.
--
Jon
JPinOH
More than that, I think it comes down to there is no good reason not to.
Of course you must use reasonable care. If the refrigerator is close to the
filler cap I would turn it off when filling with gasoline. However, if it
is on the other side of the vehicle, maybe not. Less danger there than
someone lighting a cigarette. Hot exhaust pipes are probably more likely to
start a fire.
Even the restrictions in the eastern tunnels is the gas bottles themselves.
They require the bottles be turned off. Since propane is heavier than air a
leak would result in the propane settling to the bottom of the tunnel.
Western tunnels, such as the Eisenhower tunnel on I70, that are high in the
middle, restrict only very large trucks of hazardous or flamable material.
Something to consider. As far as I know, it's the law in
most localities to turn your engine off while refueling. It
doesn't make a lot of sense as you don't turn it off while
waiting to pull up to a pump. I had just finished fueling up
my truck when a guy pulls up, jumps out and starts to pump
gas in his tank. He didn't turn off his vehicle. I mentioned
he was supposed to turn off his engine while fueling. He
told me to fuck off and said racers do it all the time. I
just replied it was the law and shut up.
Hugh wondering how many other assholes are out there
> We just can't afford all this carnage. Oh, the humanity....
ARGH!! [ROFLMAO] <big grin>
> (Oh, wait -- were you serious?)
I think he was. Silly person.
(w.b. GB)
:)
JR
> Ridiculous in real life. Gas vapor is heavier than air and
> needs a concentration to be explosive. The fridge flame is
> contained in a burn chamber and is very small in size. The
> location is at least 4' from ground level. The chance of an
> ignition is practically zero. Your scenario would be more
> likely for a passing motorist lighting a cig with his butane
> lighter.
Yabbut...
Remember to turn off your CELL PHONE and iPod while refueling.
Hehehehehe! <g>
(...and the the starter assembly on the average vehicle is explosion proof.)
(Gawd, how DID we survive to be this old?)
:)
JR
> Ok, everybody does it and nobody died! I guess the right answer is if you
> don't really need to, don't , but if you do , go ahead.
Please don't take personally, Barry. You (probably) innocently "scratched the
surface" of one of the [Ford vs Chevy] controversies in the RVing world.
I had a 3-way refrigerator in my popup. The LP was MANUALLY ignited so it
never stayed lit while towing for any distance. The 12VDC setting drew-down
the camper battery too much for my liking (we dry camped a lot), so I just
loaded-up (*PACKED*) the fridge with pre-chilled stuff before departing and
left the thing shut OFF.
Now, with a travel trailer and automatically ignited 2-way refrigerator, I
leave it turned ON (on gas) while towing.
I am ALWAYS aware of it during refueling. It is located on the side OPPOSITE
that of my pickup's fuel inlet.
Should I ever encounter a refueling situation where there is a nearby spill,
on a DEAD CALM day, I will certainly turn off my RV's refrigerator.
:)
JR
> Hugh wondering how many other assholes are out there
I'm not an asshole and, had you mentioned my engine running while I refueled
my vehicle, I probably would sheepishly turn off my engine.
(Obviously, I have left my engine running during refueling. Obviously, I
don't see sufficient "problem" with doing so. Since shutting-down the engine
is THE LAW in most [every?] places, and concern for leaving my engine running
was expressed, I would do the CIVIL thing and shut off my engine. I have
never understood getting mad at the CORRECT person: I would NOT tell you to
f.o.)
:)
JR
>> Hugh wondering how many other assholes are out there
> Other than whom?
Ya, know... You ARE a curmudgeon!
<BG>
JR
(Give the Governor a "Harumph!".
>> Yipes! Legal some places and illegal (most?) others, crazy always! eg,
>> driving past another vehicle leaking gasoline, passing an accident scene
>> where gasoline has spilled on the road, waiting your turn at the gas pump,
>> etc, etc.
> Your imagination is more dangerous than reality in this case. None of that
> has happened yet.
If you want to know why there are restrictions in TUNNELS, just "google" for
"The Holland Tunnel".
Bad fire...
:\
JR
I ran outa gas with my '50 Lincoln once and sloshed some gas
in the side draft carb. Didn't slip the air cleaner back on
though and when I started it the darn thing backfired
through the carb and caught the sloshed gas on fire. Luckily
a cop was across the street and he put it out with a fire
extinguisher. He told me not start it as he would call for a
tow truck. I waited till he was back to his car, started the
old girl up and drove off.
Hugh
> You are kidding? Legal most everywhere. Illegal in a couple underwater
> tunnels in the east. I will guess that 90% or more RV run with their
> refrigerators operating on propane.
Here is a link to a letter on this from Brian Yeates, of Langley RV (a big
outfit)-he is their tech guru and has lots of credibility. (Second letter
on that topic on right side, scroll down a bit ) Note part about the laws
in different places and his personal recommendation.
http://www.rvtimes.com/arch/107/mailbag.php
Clearly this is a matter of personal taste for risk with unlikely, but
possible, risk scenarios. It seems from what Brian says though, that more
places will be mandating against it over time.
Regards,
Barry
>
>Yabbut...
>
>Remember to turn off your CELL PHONE and iPod while refueling.
>
>Hehehehehe! <g>
>
>(...and the the starter assembly on the average vehicle is explosion proof.)
>
>(Gawd, how DID we survive to be this old?)
>
> :)
>JR
And your hearing aids, Walkman, cattle prod, battery operated sex
toys, etc.
8:)
unk
>....cattle prod, battery operated sex
> toys, ...
Is that a redundancy?
Regards,
Barry
They say "In some provinces and states it is legal to travel with the lp gas
system turned on and the appliances in operation"
What I would like to hear is in which provinces and states it is not legal.
There are specific locations that prohibit any propane period:
For Example:
Baltimore Harbor and Ft. Mc Henry tunnels
Brooklyn Battery tunnel
Holland Tunnel
Some tunnels and ferrys restirct the size of bottles and a few of them may
require the bottles be turned off. But have not heard of any state or city
that prohibits the bottles being turned on when traveling. If there is such
a restriction we would like to hear about it.
Not a clue. Here is a link to all the tourism web sites for the states and
provinces-maybe they know?
http://www.rvtimes.com/reference.php?file=links_govt
My simple solution is to not do it, but then we don't need to, so we don't
need that info. Stuff stays cold enough for us between stops until fridge
going again- it is just not a problem.
Regards,
Barry
You admit that you are clueless, yet you keep insisting that there are laws
prohibiting this practice why? What is your personal agenda?
I do not think he has an agenda. But pull into a service station with it
running and start a fire due to it. The station owner's lawyer can
explain to you why it is not a good idea to do so.
>
>I do not think he has an agenda. But pull into a service station with it
>running and start a fire due to it. The station owner's lawyer can
>explain to you why it is not a good idea to do so.
Can you find us a case? A hot cat converter is a heck of a lot closer
to the ground, and sterters aren't exactly explosion proof.
As has been posted before. Besides, a vehicle with a gas
engine having defective plug wires would be more apt to
trigger a gas vapor explosion than a fridge running on
propane gas. It's enclosed in a compartment at least 4'
above ground level, behind a compartment door, inside an
enclosed chamber.
Hugh
"Chris Hill" <chilln...@centurytel.net> wrote in message
I love this discussion. Sheeple are so, so ready to promulgate the
knee-jerk rumors. Kinda like the "CELL PHONE CAUSES 4-MEGATON
EXPLOSION IN GAS STATION".
I will not dispute that a propane refer or catalytic heater has caused
harm in some circumstances. BUT, as an attorney, I have looked for
liability cases of such and seen almost none of either.
There has NEVER been a factual case of cell phone induced fire or
explosion that I can find.
unk
> There has NEVER been a factual case of cell phone induced fire or
> explosion that I can find.
That doesn't matter.
What REALLY matters is that I *FEEL* so much safer with that restriction
plainly posted at the gas pump. <wink>
I'm waiting for using my iPod to be specifically banned while refueling. I
have heard that there have been several TERRIBLE fires at gas stations caused
by iPods.
(Yeah, right.)
:)
JR