Jump to content


Icon Welcome to the FMCA Motorhome Forums!

Register now to gain access to all of our features. Once registered and signed in, you will be able to create topics; post replies to existing topics; upload pictures; manage your profile; get your own private messenger; create blogs; and more. Sign up now! Already have an account? Sign in. This message will be removed once you are signed in.


Photo
- - - - -

Dometic RM 8401 Refrigerator


  • Please log in to reply
15 replies to this topic

#1 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 04 August 2013 - 09:38 AM

Hi there...

I have a question.
A have a refrigerator Dometic RM 8401 and I use gas as energy (and 12V DC power for electronic from car battery).
May I connect (direct) solar panel (which has 20V output) to the refrigerator for supply electronic?
Because, I have a problem with car battery.
Which is max. DC voltage for electronic (for this model)?

Tnx
Jurica,
Croatia


  • 0

#2 desertdeals69

desertdeals69

    Advanced Member

  • Members
  • PipPipPip
  • 1,219 posts

Posted 04 August 2013 - 12:20 PM

I would guess that the max would be 15-16 volts.  I think you need to use a deep cycle battery and let the solar panel charge the battery.


  • 0

#3 DickandLois

DickandLois

    Advanced Member

  • Members
  • PipPipPip
  • 1,562 posts
  • Location:Where ever the wheels stop ?

Posted 04 August 2013 - 01:04 PM

Hi Jurica, Welcome to FMCA.

Like DD mentioned, you probably will need a Battery as the main source of  12 volts. Unless you have a larger solar setup on your coach and when the sun goes down your refrigerator will shutdown.

 

Rich.


  • 0

#4 wolfe10

wolfe10

    Advanced Member

  • Moderator, Super
  • PipPipPip
  • 3,658 posts
  • Location:League City, Texas

Posted 04 August 2013 - 01:08 PM

Refrigerator PC boards are expensive.

 

A battery will keep voltage from going above (daytime) and below (nighttime) board tolerances.


  • 0

Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)


#5 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 04 August 2013 - 02:46 PM

Tnx guys...

 

I understand.

But, the problem is (I guess) in battery.

Early morning (about 4-5 a.m.), the voltage of battery is under 10,5 V, and the system shutdown.

I my opinion, I have to change the battery.

Or?


  • 0

#6 wolfe10

wolfe10

    Advanced Member

  • Moderator, Super
  • PipPipPip
  • 3,658 posts
  • Location:League City, Texas

Posted 04 August 2013 - 03:30 PM

Yes, 10.5 VDC indicates either a bad battery or excessive loads for the size battery you have.

 

If you are not running other 12 VDC things, then, indeed, replace the battery before it costs you a PC board.

 

Brett


  • 0

Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)


#7 desertdeals69

desertdeals69

    Advanced Member

  • Members
  • PipPipPip
  • 1,219 posts

Posted 04 August 2013 - 07:50 PM

What kind of batteries do you have?  You need to have deep cycle batteries such a two 6 volt golf cart batteries.


  • 0

#8 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 05 August 2013 - 03:55 AM

I have a 12V (gel) battery from solar system.

 

But, the battery is old (in my opinion)-- about 10 years old.

 

I think her life time is ending...


  • 0

#9 desertdeals69

desertdeals69

    Advanced Member

  • Members
  • PipPipPip
  • 1,219 posts

Posted 05 August 2013 - 11:50 AM

Its probably past its useful life.  Needs replacing.


  • 0

#10 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 05 August 2013 - 04:55 PM

I agree.

I would be happy to have that part (DC 12V) somehow avoid.

Can be somehow be avoided?

I mean, I only need gas to cool the refrigerator, and the DC part ( power for electronic) bothers me.

Can I (somehow) bypass that part?


  • 0

#11 wolfe10

wolfe10

    Advanced Member

  • Moderator, Super
  • PipPipPip
  • 3,658 posts
  • Location:League City, Texas

Posted 05 August 2013 - 05:09 PM

In a word, NO.

 

12 VDC controls the PC board AND opens the propane valve and powers the ignitor, etc. No way to do this without 12 VDC.


  • 0

Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)


#12 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 06 August 2013 - 09:13 AM

Wolfe10, I know that.

 

But, I have in mind, to replace electro-valve with (ordinary) mechanical valve.

 

So, I have gas constantly.


  • 0

#13 desertdeals69

desertdeals69

    Advanced Member

  • Members
  • PipPipPip
  • 1,219 posts

Posted 06 August 2013 - 12:08 PM

Not a good idea.  I think the early rv refrigerators did not require electricity just like the home evaporation refrigerators of the 30's.


  • 0

#14 desertdeals69

desertdeals69

    Advanced Member

  • Members
  • PipPipPip
  • 1,219 posts

Posted 06 August 2013 - 12:10 PM

What is the reason for your dislike for a battery?


  • 0

#15 wolfe10

wolfe10

    Advanced Member

  • Moderator, Super
  • PipPipPip
  • 3,658 posts
  • Location:League City, Texas

Posted 06 August 2013 - 01:03 PM

If you remove the 12 VDC and put in a manual gas shutoff valve, you will still need a spark.  Said another way, if you just left it on 24/7 (no need for spark and thermostat non-functional), you would have no control over temperature and would likely freeze everything in the refrigerator.


  • 0

Dianne and Brett Wolfe
1997 Safari Sahara 3540
Moderator, FMCA.com Forums
Chairman, FMCA Technical Advisory Committee
Member, FMCA Long-Range and Development Committee 2007-2009
Moderator, http://www.dieselrvclub.org/(FMCA chapter)


#16 lovatorica

lovatorica

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 07 August 2013 - 03:33 PM

desertdeals69, I dislike a battery because I would like to be independent of electricity (especially, charging the battery over the day).

wolfe10, it is seems, I have to, unfortunately, secure 12V power for electronic.

 

Tnx guys and regards from Croatia !!!!


  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users