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Henry

Snyder, Texas

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Posted: 01/17/21 11:35am Link  |  Quote  |  Print  |  Notify Moderator

I just want to operate a residential fridge thru my inverter. How many 12v batteries and will a 100w panel work?


Henry Holley
Snyder, Texas
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Lwiddis

Monterey, California

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Posted: 01/17/21 11:47am Link  |  Quote  |  Print  |  Notify Moderator

Is your fridge 12 volt or 120 volt? How many amps does the fridge use when running? How efficient is your inverter? How many amp hours will your batteries hold? Are you sure the fridge is all you want the batteries to power? Better approach is to do an energy survey to determine your needs...then times 1.5.


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wanderingaimlessly

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Posted: 01/17/21 11:47am Link  |  Quote  |  Print  |  Notify Moderator

A resi fridge will draw upwards of 1000 watts on start up, a smaller unit (10 cuft) may draw a little less, you'll likely need a pair of GC batteries and two 100 watt panels as a minimum, and will not be able do much of anything else from them. and a couple of rainy/cloudy days will likely overtax that. Better to look at 4 batteries, and at least three 100 watt panels and 4 would be better.
A very rough rule of thumb is to try to match watts of solar to amps of battery, ie for a single battery with almost 100 amp hrs capacity to a 100 watt panel.
An audit of your actual usage, and then sizing a system to be 50 to 100% above your indicated usage is preferred to allow for partial shade or overcast conditions.

Lwiddis

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Posted: 01/17/21 11:58am Link  |  Quote  |  Print  |  Notify Moderator

Henry, a 100 watt solar panel under ideal conditions will produce 5.6 amps per hour...nominal 12 volts. Solar is great but you can’t do much with one 100 watt panel. You need adequate panels, batteries, a controller and large size wire...all based on an energy survey.

ORbiker

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Posted: 01/17/21 12:07pm Link  |  Quote  |  Print  |  Notify Moderator

Henry
We have a residential frig in our Solitude. It will draw a little bit more then 100AH in a day. I put 4 100AH lithium batteries and 4 160W panels on the roof. I should have done at least 6, but I have 200W of portable, so We are ok.
Having the big battery bank I think works well. I have a Honda 2000i for a backup and the lithium batteries charge way faster then wet cell batteries. KEN

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Lwiddis

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Posted: 01/17/21 01:18pm Link  |  Quote  |  Print  |  Notify Moderator

Running a residential fridge in an RV while dry camping takes planning.

time2roll

Southern California

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Posted: 01/17/21 01:40pm Link  |  Quote  |  Print  |  Notify Moderator

Henry wrote:

I just want to operate a residential fridge thru my inverter. How many 12v batteries and will a 100w panel work?
Plenty of reports that have 4 batteries and 500 watts solar still needs a generator at times. You will get more power from your solar with lithium. Solar is good for maybe 5-6 hours a day, fridge runs 24/7.


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Gdetrailer

PA

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Posted: 01/17/21 02:43pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Henry wrote:

I just want to operate a residential fridge thru my inverter. How many 12v batteries and will a 100w panel work?
Plenty of reports that have 4 batteries and 500 watts solar still needs a generator at times. You will get more power from your solar with lithium. Solar is good for maybe 5-6 hours a day, fridge runs 24/7.


Actually the fridge will generally on run the compressor 20minutes to 30 minutes per hr so in reality fridge runs 12 hrs or a bit less per 24hr..

Inverter can be an issue but if you have an inverter which has a power save feature you can reduce the amount of energy used by the inverter when it only powers up when there is a AC load demand large enough to turn it on.

For the record, I am only using one pair of 6v GC2 batteries to power my home fridge conversion for 24 hrs between charging..

naturist

Lynchburg, VA

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Posted: 01/17/21 03:48pm Link  |  Quote  |  Print  |  Notify Moderator

Not enough information to hazard a guess, IMHO.





pianotuna

Regina, SK, Canada

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Posted: 01/17/21 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

Start with an energy audit. Decide how much reserve capacity you want. From that design the battery bank. Build a solar panel system that will recharge the battery bank.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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