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Old 04-24-2016, 06:43 PM   #1
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battery

I tried reviving an old thread and was told it was too old.

I just got back from a short solo weekend of dry camping. I ran the furnace for about 20 minutes at most. The lights were used infrequently, and the water pump switch we left on, but not used for extended periods. The refrigerator was on the whole time. At the end of 36 hours, there was very little battery power left on a system using two deep cycle batteries. I have a 2016 Roo 21BD. I did accidentally leave the amber porch light on over night last night. I still would not expect there to be that much battery drain by myself. The refrigerator I have is a Dometic model DMR702. I can't find in the owners manual that it has the defrost element that people are referring to with their older models. It has what they refer to as a heater, but make it sound like it is the heater for the cooling system to even operate. The sticker in the door says 2.7 amp when on 120V, but nothing when connected to 12V. Any ideas?

Finally, will a 200 amp solar panel be adequate to keep the battery boosted enough to extend the dry camping trip without necessarily fully charging the batteries in a day. I know most people I see are saying 400-500 amp. We rarely go for more than 3 days and only need to be able to prevent totally draining the batteries.
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Old 04-24-2016, 06:56 PM   #2
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I got by fine on two group 24 12Vs for two or three days without dropping below 60% charge. You shouldn't need solar for what you're describing. Leaving that outside light on MAY have dropped it a good bit. How are you checking charge and how are you charging?
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Old 04-24-2016, 07:05 PM   #3
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I charged with shore power for more than 24 hours prior to leaving. I am checking with the lights on the panel just inside the entry door. It showed all four lights being on when I left and this morning it was at the 1/3 light. I haven't done anything more scientific than that at the moment. We felt like we were having trouble last fall after we got it because we were constantly needing to monitor battery usage every time we went out. We feel like there is something that is draining the batteries that we are not aware of. Purchased the second battery at the dealer when we took delivery in order to make sure that there would not be a problem. Last fall we went out and it was cold enough that we needed to run the furnace the first night. It killed the batteries that night.
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Old 04-24-2016, 07:31 PM   #4
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I'm starting to question the health of the batteries. The deeper you discharge them and the longer you go before fully recharging can shorten life on them. You've most likely got hybrid / marine type batteries that aren't really ideal for deep cycle use. They'll work, but you've got to take care of them. It's also possible you've just got a weak battery. The status lights are a joke, but 1/3 will generally tell you that you are actually on the low side. It sounds like you use your rig like I use mine. What I ended up doing after my 12V finally died (took about four years) is switch to 2 6V in series and get a good charger ( I use a CTEK 7 stage ) and just leave it plugged in when not in use.
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Old 04-24-2016, 07:46 PM   #5
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I purchased two of these matching batteries last september 2015 from the dealer at delivery.
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Old 04-24-2016, 07:50 PM   #6
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Yes your dmr702 has a defrost element and no switch to turn it off.

How old was your first battery when you added the second?



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Old 04-24-2016, 07:56 PM   #7
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they were both brand new. Do you know if the option I have seen to cut the wire on the heating element works on this fridge?
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Old 04-24-2016, 07:58 PM   #8
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It's still possible that one of them isn't holding a charge and dragging the other down with it. Your two big battery killers are going to be water pump and furnace. Water pump shouldn't be an issue unless you use it a lot. Your refrigerator controls and CO detector will constantly pull, but it's fairly minimal. I'd pull them and have them load tested (on a deep cycle test) just to see, it may not show anything but if it does, you'll know for sure. I had this exact thing happen to me this past fall. I went to kick on the furnace and the lights dimmed on night number one. One of my batteries died. They showed fully charged when I left the house 12 hrs earlier and the only thing running was the refrigerator control and the CO detector.
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Old 04-24-2016, 07:59 PM   #9
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Quote:
Originally Posted by brian21BD View Post
they were both brand new. Do you know if the option I have seen to cut the wire on the heating element works on this fridge?


It works but have not done it yet, the wire can be found through the light switch access hole.
Here's your fridge wiring diagram.
T is the heating cable being referred to as the defrosting circuit.
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Old 04-24-2016, 08:04 PM   #10
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Quote:
Originally Posted by TURBS View Post
Yes your dmr702 has a defrost element and no switch to turn it off.
That'll do it....I'm still in disbelief that they would put something like that in an RV with no switch.
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