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 > Residential Fridge battery run time

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pianotuna

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Posted: 04/21/22 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

Any battery of that capacity (~80 amp-hours), even my beloved SiO2 chemistry, is not going to be enough. Two 100 amp-hour batteries are probably not going to be enough. 300 amp-hours would be minimal. Recharging of a bank of that size in 4 hours would be about 1000 watts of panels.

A dc to DC charger would be useful for charging while trundling down the road.

I suggest using a kill-a-watt meter to actually measure the energy this fridge uses, per 24 hours.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Wade44

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Posted: 04/21/22 07:44pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

JimK-NY wrote:

Re-charging the battery bank would take a great many hours of generator run time. A large residential refrigerator is not practical unless you plan on hook ups at all times.


Unless you add sufficient solar--in which case the costs for generator can be ignored.



Except JimK may find it may be hard to get sufficient solar in NY.


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austinjenna

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Posted: 04/22/22 03:49am Link  |  Quote  |  Print  |  Notify Moderator

The reason for my asking is my unit is in a storage yard and currently with my 3 way fridge I go the night before and start it up so its cold by the time I pick it up. I have no hookups at the storage yard.

But it seems the new units all have residential fridges in them and I was wondering about the run time on them as it seems it doesn't have the capacity to do the same routine as I currently do. I know I could always upgrade the battery bank.

My storage yard is only a few miles from my house so starting it up when I go get it only gives me about 10 minutes before I get it home which is not enough time for it to cool off.

We all know if I ask the dealer they will tell me it will run for a week LOL



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Posted: 04/22/22 04:17am Link  |  Quote  |  Print  |  Notify Moderator

austinjenna wrote:

The reason for my asking is my unit is in a storage yard and currently with my 3 way fridge I go the night before and start it up so its cold by the time I pick it up. I have no hookups at the storage yard.

But it seems the new units all have residential fridges in them and I was wondering about the run time on them as it seems it doesn't have the capacity to do the same routine as I currently do. I know I could always upgrade the battery bank.

My storage yard is only a few miles from my house so starting it up when I go get it only gives me about 10 minutes before I get it home which is not enough time for it to cool off.

We all know if I ask the dealer they will tell me it will run for a week LOL


Absorption fridge takes a lot longer to cool. But if you freeze what you can, precool everything else before you load the fridge everything will be safe as the system will not need to cool as much

austinjenna

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Posted: 04/22/22 05:17am Link  |  Quote  |  Print  |  Notify Moderator

Quote:


Absorption fridge takes a lot longer to cool. But if you freeze what you can, precool everything else before you load the fridge everything will be safe as the system will not need to cool as much


We do this now

valhalla360

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Posted: 04/22/22 06:29am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

I recommend 600+ watts solar if camping off-grid and expecting minimal generator use.
Probably 400+ ah of LFP batteries too.


Be very careful of very specific recommendations with no clue what you have or how you use it.

Do an audit of the electrical devices and how long they will be operating. Then based on that size the solar panels and battery bank.


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wa8yxm

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Posted: 04/22/22 02:57pm Link  |  Quote  |  Print  |  Notify Moderator

austinjenna wrote:

I know there are variables involved here on the manufacturer of the fridge, battery etc... But for those of you that have one assuming the standard group 27 battery the dealer gives you - how long can you run that fridge on just the battery?

Group 27 = about 100 AH, Marine Deep cycle you should not use more than 25 Ah. that's translates (Once you run it through an inverter) to about 250 watt hours (1/4 KWH) note this is at the 20 hour rate. used at the higher rate of the fridge. 1-2 hours run time likely 1.


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Posted: 04/22/22 04:48pm Link  |  Quote  |  Print  |  Notify Moderator

The nice thing about a residential fridge is they only take a couple of hours to cool down.

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austinjenna

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Posted: 04/23/22 04:45am Link  |  Quote  |  Print  |  Notify Moderator

Thanks. I am not talking about boondocking or solar panels just simply starting the fridge for it to cool down before I bring it home to load up and head out.

It sounds like it will only run a couple of hours on 1 battery

JRscooby

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Posted: 04/23/22 06:51am Link  |  Quote  |  Print  |  Notify Moderator

austinjenna wrote:

Thanks. I am not talking about boondocking or solar panels just simply starting the fridge for it to cool down before I bring it home to load up and head out.

It sounds like it will only run a couple of hours on 1 battery


If you are really worried about it instead of turning on put a bag of ice in a dishpan, leave in fridge overnight.

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