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Old 07-05-2016, 10:16 AM   #1
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Extension cord

It it ok to run about 100 foot of cord to plug in to a 110 outlet so I can run fridge?


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Old 07-05-2016, 10:29 AM   #2
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Yes.
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Old 07-05-2016, 11:44 AM   #3
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You don't say what wire guage of cord you are using, but just the fridge (and the converter, which doesn't use much if its just maintaining the battery) connected should be OK.

Power loss is proportional to the square of the current. RV absorption fridge boiler elements draw about 3 amps so the power loss, and thus the voltage drop, will not be too great. Just don't use anything else.
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Old 07-05-2016, 12:22 PM   #4
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Power loss is proportional to the square of the current. RV absorption fridge boiler elements draw about 3 amps so the power loss, and thus the voltage drop, will not be too great. Just don't use anything else.
Dave, where is the power lost? Is it related to the length and gauge of the cord? Trying to understand the above but I guess I need a little more detail.
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Old 07-05-2016, 12:38 PM   #5
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It your everyday orange cord, just trying to cool fridge down before we leave. I have to run propane on shore power for fridge?


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Old 07-05-2016, 01:23 PM   #6
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Should be OK. I leave mine plugged in while in storage with the same cord (just to keep the batteries charged)
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Old 07-05-2016, 06:05 PM   #7
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Dave, where is the power lost? Is it related to the length and gauge of the cord? Trying to understand the above but I guess I need a little more detail.
The power is lost in resistance heating of the cord wiring. That's why the cord gets hot. Shorter cords and heavier wiring reduces the heating losses.

This is really all the fridge heater element is, but it's a wire that is designed to get hotter, just like the heater wire in a space heater.

This also results in lower voltages at the end of the cord. So don't add any more load unless you get a shorter cord with heavier wire.
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Old 07-05-2016, 06:12 PM   #8
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Originally Posted by TheHolders5 View Post
It it ok to run about 100 foot of cord to plug in to a 110 outlet so I can run fridge?


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I've done this for 12 years without any issues.
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Old 07-05-2016, 06:18 PM   #9
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I would never own an extension cord at 100 feet less than 12 gauge. Better to go with 10 but the cost and weight start going up fast.

Yes Voltage Drop is the issue and the lower the voltage the more amps and more heat is created.

Just running the Fridge probably is not going to cause an issue.

Voltage Drop Calculator



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Old 07-05-2016, 07:13 PM   #10
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Originally Posted by DaveSchwartz View Post
Power loss is proportional to the square of the current. RV absorption fridge boiler elements draw about 3 amps so the power loss, and thus the voltage drop, will not be too great. Just don't use anything else.
Quote:
Originally Posted by JD and Beastlet View Post
Dave, where is the power lost? Is it related to the length and gauge of the cord? Trying to understand the above but I guess I need a little more detail.
Quote:
Originally Posted by rockfordroo View Post
The power is lost in resistance heating of the cord wiring. That's why the cord gets hot. Shorter cords and heavier wiring reduces the heating losses.

This is really all the fridge heater element is, but it's a wire that is designed to get hotter, just like the heater wire in a space heater.

This also results in lower voltages at the end of the cord. So don't add any more load unless you get a shorter cord with heavier wire.
Yes, I understand that. But saying "Power loss is proportional to the square of the current" sounds like a formula, and any such formula would have to take into account the length and gauge of the extension cord, would it not?
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