Refrigerator and Amps/hrs

[icanon]

Ok Ok maybe this question has been asked before but I haven't found the answers I'm looking for.

A typical RV dual power refrigerator (electric/propane) how much Amps/hours does one consume when running on only propane during a nice hot summer day (24hrs period)?

So when one flips the switch to run on propane how much power can one expect to use?

Thanks

[icanon]

2oldman wrote:

icanon wrote:
If I may continue to ask:

A) if someone requires 0.5 amp-hour what exactly does that mean for a 24 hrs period?

is the answer 12 amp-hrs?.

I gave an example above.

The answer is yes. If something draws 0.5 amps, continuously, and runs for one hour, that's 0.5 ah.


0.5 ampere drawn for 1 hour is one half amp-hour. So is 0.25 amp drawn over 2 hours. The stickler reason it's not "amp/hr" is because the "/" means "divided by". And amp-hr is not "divided by", it's multiplied.

Thanks for clearing that up.

[pianotuna]

A. Yes 12 amp-hours per day
B. Yes theoretically 24 amp-hours of storage but no one would choose to have a bank that small if they were serious about boondocking.

Look up the Peukert Laws which expresses approximately the change in capacity of rechargeable lead-acid batteries at different rates of discharge. As the rate increases, the battery's available capacity decreases, approximately according to Peukert's law.

icanon wrote:
If I may continue to ask:

A) if someone requires 0.5 amp-hour what exactly does that mean for a 24 hrs period?

is the answer 12 amp-hrs?


B) how much (amp-hrs) battery do one need to run a Refrigerator for 24 hrs?

is the answer a minimum 24 amp-hrs as we don't want to drain the battery below 50%?

Again thanks for the replies.

Btw my refrigerator is a Norcold N61X and I can't find anything in the manual or on the web.

[2oldman]

icanon wrote:
If I may continue to ask:

A) if someone requires 0.5 amp-hour what exactly does that mean for a 24 hrs period?

is the answer 12 amp-hrs?.

I gave an example above.

The answer is yes. If something draws 0.5 amps, continuously, and runs for one hour, that's 0.5 ah.


0.5 ampere drawn for 1 hour is one half amp-hour. So is 0.25 amp drawn over 2 hours. The stickler reason it's not "amp/hr" is because the "/" means "divided by". And amp-hr is not "divided by", it's multiplied.

[GordonThree]

pianotuna wrote:
Hi GordonThree,

The duty cycle on the Dometic in my RV is 2:3 with the door never opened. The Norcold may be similar. That brings daily usage by just the fridge to around 40 amp-hours per day. Other folks have reported 36 amp-hours per day.

The real answer depends on the particular fridge make and model. One fellow on facebook claims 12 amp-hours per day.

I suppose 12 is possible, if the door is never opened, door seal heater off, and low ambient temperature... lots of variables.

I'll soon have individual load monitoring on my RV, for no reason in particular other than I like to have the data.

[icanon]

If I may continue to ask:

A) if someone requires 0.5 amp-hour what exactly does that mean for a 24 hrs period?

is the answer 12 amp-hrs?


B) how much (amp-hrs) battery do one need to run a Refrigerator for 24 hrs?

is the answer a minimum 24 amp-hrs as we don't want to drain the battery below 50%?

Again thanks for the replies.

Btw my refrigerator is a Norcold N61X and I can't find anything in the manual or on the web.

[2oldman]

If the control board draws 0.1 amp all the time, over one hour that's 0.1 amp-hr. Over 24 hours that's 2.4 ah.

[pianotuna]

Hi GordonThree,

The duty cycle on the Dometic in my RV is 2:3 with the door never opened. The Norcold may be similar. That brings daily usage by just the fridge to around 40 amp-hours per day. Other folks have reported 36 amp-hours per day.

The real answer depends on the particular fridge make and model. One fellow on facebook claims 12 amp-hours per day.

GordonThree wrote:
The instaneous draw for the propane solenoid + control board on my norcold is 2.4 amps. I've never tracked the usage over an hour or day, which would vary on how much food is in there, door openings, ambient temperature, battery voltage, etc.

[mbopp]

Don't forget the power used by the door heater. On my old Dometic I could turn it off but the Atwood is hard-wired.

[GordonThree]

korbe wrote:
mine uses 0.30

In that case, your propane solenoid must be closed. The valve has a good size return spring on it (fail-closed), and needs a big magnet to hold it open; the draw will be a lot higher while the burner is operating.

[icanon]

2oldman wrote:

icanon wrote:
Thanks for the answers. So basically not much more than 12 amps/day. Great!

12 ah..maybe.

It's amp-hours, not amps/hrs or amps/day.

Excuse my ignorance I'm trying to understand this amps hrs thing. 😮 🙂

If I may continue to ask:

A) if someone requires 0.5 amp-hour what exactly does that mean for a 24 hrs period?

is the answer 12 amp-hrs?


B) how much (amp-hrs) battery do one need to run a Refrigerator for 24 hrs?

is the answer a minimum 24 amp-hrs as we don't want to drain the battery below 50%?

Again thanks for the replies.

[korbe]

mine uses 0.30

[2oldman]

icanon wrote:
Thanks for the answers. So basically not much more than 12 amps/day. Great!

12 ah..maybe.

It's amp-hours, not amps/hrs or amps/day.

[GordonThree]

The instaneous draw for the propane solenoid + control board on my norcold is 2.4 amps. I've never tracked the usage over an hour or day, which would vary on how much food is in there, door openings, ambient temperature, battery voltage, etc.

[icanon]

Thanks for the answers. So basically not much more than 12 amps/day. Great!

[midnightsadie]

when on propane the only thing using 12v is the computer board. don,t think you could measure it.