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Old 12-02-2016, 11:18 PM   #1
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Talking Residential Fridge

I have added a Magic Chef Residential 10 cu ft refrigerator to the old Astoria and wanted to ask you wise gentlemen a question. I presently run 4 deep cycle batteries with a ps 2000 watt inverter. Would it be better to install 2 more battery's or put in a dedicated inverter with the 2 batteries.
Richard
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Old 12-03-2016, 01:15 AM   #2
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You may not need more batteries, but if you decide you do, increase the size of the bank rather then having two separate banks.

The reason for this is that you will get more life out of running down the larger bank to 75% than running down a smaller bank to 50%.

If you were to lookup ( DOD ), depth of discharge, on a deep cycle battery, the graph will show that the deeper the discharge, the less of them you will get from the battery.
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Old 12-03-2016, 08:21 AM   #3
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It really depends on how you RV. We have a household refer on a dedicated inverter. The reason we chose to go that way is that we boondock a lot. With the dedicated inverter we can and do turn our Bus house inverter OFF when in the weeds. This way we eliminate the inefficiency loss we see on our large inverter even when we're powering nothing but the refer, but we also eliminate all the phantom losses and power uses that your manufacturer hooked to your inverter and didn't tell you about. Also, we travel with the inverter off and let the engine charge house batteries. Refer stays powered but again all unknown loads that the big inverter would be powering are eliminated. We get a faster and more complete battery charge.

If you generally stop at hookup sites, there's little reason to go through the extra expense and trouble of a dedicated inverter as you're operating on shore power, not internal power. As to whether the 4 batteries will hold enough charge to support your refer, that one is hard to answer. It should, but it depends on how many times your refer door is opened, do you have cold water in the door, does the refer make ice and do you use a lot of it, and what the temp outside, inside and surrounding the refer is (parked with refer side south in the desert in summer will be different from Alaska). Of course if you're boondocking you are also using power for other things and this will have a large impact.

I'd suggest trying just the refer on the house batteries and see how it goes. If you heed to run the genny more than you like, you can then go to other solutions. We have 810W of solar on the roof which definitely helps and use the entertainment system seldom when boondocking.
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Old 12-03-2016, 09:55 AM   #4
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As far as 1 or 2 inverters, I run a 2000 watt Xantrex psw inverter for everything. It draws <.5 amps while on, in idle mode.

A Xantrex 1000 watt psw inverter draws the same amount.

You will need one on all the time for the fridge anyway, so having a second, for other uses, will double your draw, while both are on.

Since the one is on anyway, get one to cover all of the loads. They only draw the power they need to cover the load your asking.

A 2000 watt inverter, running at 1000 watts, will not draw more then a 1000 watt inverter running at 1000 watts.
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Old 12-03-2016, 10:10 AM   #5
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I have 4 8D batteries for the house with a 3000 watt PSW inverter and have a Jenn Air refer/freezer. Going to all electric would have gotten my rig 2 add'l 8D batteries and a second PSW inverter.
I did remove the propane cooktop and replaced it with an induction unit, but it won't run off the inverter till I do some rewiring. Since it can draw 1500 watts I'll have to watch my load and draw down after doing the rewiring or add the 2nd inverter and 2 batteries ($$$).
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Old 12-04-2016, 06:37 AM   #6
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Quote:
Originally Posted by quickiwe View Post
I have added a Magic Chef Residential 10 cu ft refrigerator to the old Astoria and wanted to ask you wise gentlemen a question. I presently run 4 deep cycle batteries with a ps 2000 watt inverter. Would it be better to install 2 more battery's or put in a dedicated inverter with the 2 batteries.
Richard
When you said 4 deep cycle batteries, how many usable amp hours do they have?
I have a 10.3 cubic foot residential fridge. It is powered by a Xantrex 2000 watt inverter/charger with 4 each, 6 volt, golf cart batteries for a usable 200 amp hours. At night when inverter and fridge on, other appliances on stand by it uses approximately 10 amp hours per hour for a total of 80 amp hours per night. 4 deep draw GC batteries give me ample power before charging is required. Usage is approximate depending on outside temps and not opening the fridge.

Hope this helps.
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Old 12-04-2016, 08:47 AM   #7
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The new residential refers draw very little power, I would think a dedicated inverter and more batteries are not necessary.
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Old 12-04-2016, 03:11 PM   #8
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If the fridge runs ok on what you have, there is no need to change inverters. Especially if the existing one is a pure sine type. Motors and compressors like pure sine better than modified sine - they run more efficiently and heat up less.

As for additional batteries, that is strictly a matter of how long you want to run off-grid. I would think the existing 4 batteries would be adequate for most needs, but if you are running low before you can recharge, either add batteries or get larger AH models. Or both.
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