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Old 07-11-2012, 05:39 AM   #1
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Residential fridge, batteries, and inverter

My '09 Camelot came with 4 - 6V house batteries, a 4K Magnum inverter, and a Dometic 1402 fridge. But I saw a newer model on the lot with a huge forklift battery, a 4K Magnum inverter, and a residential fridge. But the factory had installed a separate 1K inverter just to run the fridge.

So my question to those of you with residential fridges, do you just use the existing batteries/inverter, or do have a separate battery and/or inverter to handle the fridge electrical load?

== John
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Old 07-11-2012, 06:21 AM   #2
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IMHO using a small separate inverter to run the fridge is a bad idea because most residential units have a large starting surge which is best handled by a larger inverter. For example, even though our Samsung refrigerator uses only ~100W of power on the average, the manufacturer says that the inverter has to be sized to handle a 11A maximum current. That would tax a 1kW inverter to the maximum but it would be easy for the 4kW to handle.

We are using our 2.5kW inverter to run the fridge when we travel and have had no problems doing that. We also have four 6-volt batteries plus a 100W solar system on the roof. We don't boondock and have no problems keeping the fridge cold for a day of traveling.
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Old 07-11-2012, 06:54 AM   #3
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I've been considering a Samsung RF195, but can't find the elec specs for an inverter choice. I like the 100W operation, but sounds like I would need at least a 1200w inverter, assuming your's is similar?
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Old 07-11-2012, 07:19 AM   #4
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When I bought my coach someone had removed the the original inverter/charger and so when I installed my residential fridge I installed a Xantrex ProWatt 2000. These are not inverter/chargers and I am thinking about buying a new Magnum inverter with the transfer switch and the built in circuit breakers because it will make things easier. I was concerned it was not of good quality but it has worked great and it will run our microwave also. If you are running the microwave and the fridge starts it will turn the inverter off normally. I have 2 mismatched 12 volt batteries for my house batteries and they have run the fridge thru the night. I have a Iota 3 stage battery charger on each bank and they work great. I am going to replace them with the 4 six volt batteries this year or next though for extra capacity they will give me. George
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Old 07-11-2012, 08:20 AM   #5
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Quote:
Originally Posted by JohnCamelot View Post
So my question to those of you with residential fridges, do you just use the existing batteries/inverter, or do have a separate battery and/or inverter to handle the fridge electrical load?== John
A separate inverter for the frig appears to be the norm.

Our 02 Monaco Signature is a factory "all electric" coach w/residential frig. It came from the factory w/two 3k watt inverters, five group 8D agm house batteries(162 Lbs ea), and a 270 amp alternator.

In our case, the two inverters are electrically linked together w/an external shunt. There is a "master" inverter, and a "slave" inverter. The frig is on the slave.

When we are boondocking and not using the genny, when we go to sleep, I leave the slave frig inverter on and turn the master off. This minimizes the draw on the house batts.
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Old 07-12-2012, 12:51 AM   #6
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Originally Posted by clyon51 View Post
I've been considering a Samsung RF195, but can't find the elec specs for an inverter choice. I like the 100W operation, but sounds like I would need at least a 1200w inverter, assuming your's is similar?
The information as to current draw when starting is included in an answer to a question on this Samsung website. Read down the page a ways: Samsung samsung 18 cu. ft. French Door Refrigerator: questions, answers, how to, FAQs, tips, advice, answers, buying guide
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Old 07-12-2012, 11:38 AM   #7
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Thanks docj. Seems -Ms Samsung is non comittal when it comes to specific questions. She says it's rated for 11.6a, uses 0.8 to 4.6a depending on what cycle it's using and no way to measure peak amps.

This is what I found interesting:

"Thank you for your question. The modified sine wave should not be an issue since the refrigerator's power supply rectifies the voltage to DC.

- Ms. Samsung"

She didn't say 12v DC, but if so, possibly no inverter needed. When I ordered my two 115vac LED TVs, to my pleasant surprise, they were actually 12vdc "rectified" down with a WART. No need for an inverter so far

I wonder if Ms Samsumg can answer what DC voltage it uses and if that is the only voltage needed to operate the frig.
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Old 07-16-2012, 12:19 PM   #8
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My 1993 Dynasty has an "apartment size" fridge, not the double-door common on new models. But I replaced the Norcold 8-series fridge with a residential unit. Very easy changeover. I shopped for the fridge based on energy requirements. It is my understanding, as another posted noted also, that most Energy Star fridges attain their low start-up current due to the fact that the incoming AC power is converted to DC and that allows a “soft start” on the compressor. The Energy Star model I chose, Model 1112, was by Summit Appliance. The company makes quite a few models of appliances for folks living “off grid” and supplying their own power. It does not appear to have the rectifying circuitry, but simply uses a small, well-engineered Panasonic compressor. Cost was higher than most other apartment size fridges—about $700.

I chose this one based on the fact that it had a “locked-rotor” current of only 7 amps. It has been happily humming along on my ancient 1200W (Non PSW) inverter for almost a year now. Its interior light dims a bit when it starts, but it starts quickly and does not exhibit any strange noises. We almost never boondock, but we do run the fridge off the inverter while we are traveling. We have run it overnight on batteries with no problems.
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Old 07-17-2012, 05:29 PM   #9
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Vanwill-

Thanks for that info. I did contact Samsung support. Although they were a bit clueless, they did manage to tell me the 12v conversion was.for a single process and needs AC to operate. No doubt the slow start for the compressor.

I looked at your unit and it would be a good fit on mine. Also like energy usage. I'll keep the ol' Dometic Royale as long as it keeps working. The first hicup and there will be a Summit in there
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Old 07-21-2012, 03:34 PM   #10
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John: You did not say if you were using your present frig on propane or 12v or 120 volts.
Our 05 HR Navigator came advertised as "all electric" 5 8d batteries and 2 -2000 watt inverters and a gas/electric reefer.. So we were forced to use the reefer on 120 volts. We switched out reefers and put a Whirlpool 2 door with ice in the door. One thing for sure the whirlpool uses 1/3 the 120volt power of the gas/elec reefer. I betting you can just switch out the reefers and continue to use the batteries/inverter you have now.
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