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Old 08-15-2014, 09:11 AM   #1
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House battery usage

I am currently stuck at a freightliner service center. They are doing repairs will take most of the day. Currently running inverter for residential refrigerator off of my six house batteries. Can anyone tell me how long battery life will be before I need to run generator or plug unit in? They are not very receptive to me plugging the unit in their electric.
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Old 08-15-2014, 09:16 AM   #2
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Assuming your batteries are in good condition and fully charged and refrigerator is already cold; I would estimate about 12-16 hours.

Why not plug into a 120V outlet?

JohnnyB
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Old 08-15-2014, 09:16 AM   #3
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Your batteries, if charged, will have no problem keeping your fridge going for the day. Just monitor your voltage and if you drop below 12.4 start the genny. I hope your rig is outdoors.
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Old 08-15-2014, 11:09 AM   #4
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We lost the power here at the park a few weeks ago for over 8 hours. We turned off the hot water heater and the ice maker on our Frigidaire energy saver fridge. Our lights are LED and tv's are LED. We did not go down very much at all. It barely moved down. When the power came back on it did not take long for the batteries to go back to full.
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Old 08-15-2014, 11:26 AM   #5
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Originally Posted by rambler5860 View Post
I am currently stuck at a freightliner service center. They are doing repairs will take most of the day. Currently running inverter for residential refrigerator off of my six house batteries. Can anyone tell me how long battery life will be before I need to run generator or plug unit in? They are not very receptive to me plugging the unit in their electric.
No way to tell you unless you give us more info.

How many amps AC does the refer unit pull?
How many amps in your house bank?

You AC appliance hits your house bank at 10X the DC rate - SO if its a 3 amp fridge- its pulling 30 AMPs minus inverter losses from your bank every hour it runs.

Is your inverter pure of mod sine wave? (this will have about a 20% effect on run time to 50% depletion)

Hope you make it!

Uncle Dave
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Old 08-15-2014, 11:31 AM   #6
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No way to tell you unless you give us more info.

How many amps AC does the refer unit pull?
How many amps in your house bank?

You AC appliance hits your house bank at 10X the DC rate - SO if its a 3 amp fridge- its pulling 30 AMPs minus inverter losses from your bank every hour it runs.

Is your inverter pure of mod sine wave? (this will have about a 20% effect on run time to 50% depletion)

Hope you make it!

Uncle Dave

Which inverter draws more current, pure or modified?
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Old 08-15-2014, 11:32 AM   #7
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a modified sign wave- will impact run time of a motor or compressor based device approximately - 20%.


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Old 08-15-2014, 11:33 AM   #8
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This might be a great time to fire up a little Honda generator on a long extension cord.
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Old 08-15-2014, 11:36 AM   #9
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a modified sign wave- will impact run time of a motor or compressor based device approximately - 20%.


Uncle Dave
I'm a little slow...

So the MSW needs more current to handle the same load?
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Old 08-15-2014, 11:41 AM   #10
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I'm a little slow...

So the MSW needs more current to handle the same load?
Yes- the non uniform effect of the square edged waveform "costs" current.

Not so much on chargers or TV's etc, but anything with a DC motor or compressor runs less efficiently.

UD
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Old 08-15-2014, 12:16 PM   #11
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Mine has rub for over 48 hrs at a Freightliner.
I forgot about the fridge. Was ok!
See sig.
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