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Dometic RM 8401 Refrigerator


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#1 lovatorica

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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


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#2 desertdeals69

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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.


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#3 DickandLois

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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.


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#4 wolfe10

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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.


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#5 lovatorica

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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?


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#6 wolfe10

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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


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#7 desertdeals69

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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.


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#8 lovatorica

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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...


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#9 desertdeals69

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Posted 05 August 2013 - 11:50 AM

Its probably past its useful life.  Needs replacing.


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#10 lovatorica

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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?


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#11 wolfe10

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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.


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#12 lovatorica

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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.


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#13 desertdeals69

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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.


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#14 desertdeals69

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Posted 06 August 2013 - 12:10 PM

What is the reason for your dislike for a battery?


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#15 wolfe10

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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.


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#16 lovatorica

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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 !!!!


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