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Old 04-17-2016, 06:30 AM   #1
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Boon docking

With 4 fully charged batteries how long should you expect them to last until they reach 12.2 volts with only running your residential frig at night.
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Old 04-17-2016, 06:34 AM   #2
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Correction 6 batteries
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Old 04-17-2016, 06:38 AM   #3
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What kind of batteries? What in the AH rating on then? What is the electrical rating of the refrigerator? What is the ambient temperature? How often will the refrigerator door be opened?

Joel
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Old 04-17-2016, 06:55 AM   #4
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They are Deep cell Interstate and on top of the battery its says 122 minutes@75Amp and then 232 ah. Ambient temp about 70 degrees
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Old 04-17-2016, 08:06 AM   #5
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The big variable is the efficiency, and thus the energy consumption of the refrigerator. At a rough guess, it might be around 1200 WH/day. This equates to 100 AH/day.

Your batteries have just under 1,400 AH. Since you don't want to run below half charge, that gives you 700 AH available. At 100 AH/day, you should be able to run the refrigerator for a week, assuming that you don't use any power for anything else.

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Old 04-17-2016, 08:12 AM   #6
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12.2 volts is not a correct indicator. With batteries under discharge, it is safe to go down to 12.0 volts.

Your refrigerator power usage will vary depending on conditions. Is the door being opened and closed or left closed all the time? Is the refrigerator full of food (better) or mostly empty? Is the ambient temperature 60 degrees F or 90 degrees F? The answer to your question depends on the circumstances.
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Old 04-17-2016, 08:28 AM   #7
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Quote:
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12.2 volts is not a correct indicator. With batteries under discharge, it is safe to go down to 12.0 volts.

Your refrigerator power usage will vary depending on conditions. Is the door being opened and closed or left closed all the time? Is the refrigerator full of food (better) or mostly empty? Is the ambient temperature 60 degrees F or 90 degrees F? The answer to your question depends on the circumstances.
To add a few more variables to this, how big is your inverter and what's the efficiency.? You can lose 2-10% just running it. THen there's the phantom loads you don't know about that your coach manufacturer attached to the DC and AC buses and didn't think to tell anyone about. Finally, how about the orientation of the coach. If you put the fridge side in the hot afternoon sun, it'll run a lot more. You might want to consider gluing a 1" plank of Styrofoam to the back of the outside fridge access to help hold down the heat loading. And have you cleaned the heat dissipation coils on the bottom of the fridge lately? Big efficiency issue.

What you really need to do is set the rig up at home like you are going to use it and TEST IT OUT FOR A DAY OR TWO. No two people are alike so my experience may be WAY different from what you experience.
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Old 04-17-2016, 09:14 AM   #8
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To supply our residential refrigerator while not connected to shore power we had to run our generator 3-4 hours in the morning and the same in the late afternoon/evening, and were barely able to keep our batteries at what I believed were 'safe' charge levels. Often the generator run time regulations did not allow sufficient run time to recharge the batteries fully. We also found we had to run the generator 4-6 hours every two to three weeks to recharge the batteries when the unit was stored, even with the factory provided 'salesman switch' disconnect in the panel above the entry stairs turned off.

We have now added 1280 watts of solar panels (8 X 160 watt). It has allowed us to dramatically reduce our generator use. When camped in bright sun, the fridge can run all day while we are away seeing the sights without depleting the batteries at all. We can run the fridge and use our TV/satellite receivers overnight, and the batteries regain full charge by late afternoon. We only have to run the generator to operate the microwave, the electric fireplace, the Oasis on electric, and/or the A/C, provided we have full sunlight where we are camped. We are experimenting with how to manage our electrical use so we can maintain our 6 factory supplied Interstate batteries at above 11.8 volts. A future shift to AGM batteries should improve our battery capacities and their practical discharge range. We now expect to be relieved of the need to be present to ensure that the generator runs regularly to charge/protect the batteries while the motor home is in storage.
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Old 04-17-2016, 09:37 AM   #9
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Originally Posted by J Birder View Post
The big variable is the efficiency, and thus the energy consumption of the refrigerator. At a rough guess, it might be around 1200 WH/day. This equates to 100 AH/day.

Your batteries have just under 1,400 AH. Since you don't want to run below half charge, that gives you 700 AH available. At 100 AH/day, you should be able to run the refrigerator for a week, assuming that you don't use any power for anything else.

Joel
These are 6 volt batteries wired in series/parallel to give 696 amp hours at 12 volts. Same as I have in my VTDP.
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Old 04-17-2016, 11:15 AM   #10
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We do quite a bit of boondocking. We normally run the generator a couple of hours in the morning while doing breakfast and watching the morning news then 2 or 3 more hours in the late evening while cooking dinner and watching tv (I always try to run it long enough to get the batteries to float voltage). We have the same battery system as you and don't really do much to try and conserve power other than turning lights off while not in use. Both Directv receivers and the satellite dish are powered all the time. I use a C-PAP machine all night and the only time we have had the AGS start the generator is when it is cold and the furnace fans are running a lot.

Have considered adding some solar capacity, but just haven't gotten one of those "round-2-it's" yet.
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Old 04-17-2016, 02:25 PM   #11
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Solaris awesome!
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