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Old 07-18-2011, 09:30 AM   #11
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Does the umbilical plug not charge your battery?....snip
It does, but at a much slower rate than using jumper cables off the TV's battery (taking advantage of the alternator output).

Bob
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Old 07-18-2011, 09:45 PM   #12
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Rustic Eagle, just to make sure I understand: if I run jumper cables from my car (TV) battery to the RV battery and run the engine, I can get a much faster recharge? How long should it take to recharge a low 12v battery that way?
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Old 07-18-2011, 10:09 PM   #13
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Hey Rapidly, I just signed on... I am a new member as well.. hi everybody.... I am not sure if its rude to just jump in here but i will give it a shot... I was reading all the comments but i didn't see anywhere where it said what batteries you were running? A single 12 volt? Dual 12's, dual sixes? I dry camp all the time, like about 95% and depending on what your running would greatly depend on how long you would last. I run two sixes and they last longer than 2 12v's, and i can get about 4 days but thats being conservative but not going hard core. I would not recomend hard boosting your RV battery with the car unless you want to replace it next year. i would recommend doing a soft boost. Hook it up to your car but don't run the car... its like 2 water tanked equilizing, the more charged battery will charge the less charged battery.. if you run the car you will blast the battery with too many amps and soon it will not fully charge at all. You can also back the car up to your trailer plug and do it that way... its just a trickle charge though....need to have it hooked up for a very long time to make a difference... this method and the soft boost method would require to keep an eye on your battery level of the car... only proform a hard boost if your absolutely need to as it will decrease the efficiency of the battery over time.
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Old 07-18-2011, 10:22 PM   #14
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Hey Canucker - first of all welcome to the forum! If you get a chance, come on over to the new member forum and introduce yourself.

We have quite a few dry campers over here so I know they will appreciate your knowledge and experience.
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Old 07-19-2011, 09:16 AM   #15
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Thanks Canucker, I appreciate the input. Wow, there's a lot more to this business of battery management for dry camping than I would have thought. I'm relatively ignorant about electricity so appreciate all the advice. BTW my camper is equipped with one 12v deep cycle battery.
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Old 07-19-2011, 11:49 PM   #16
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Honestly if you only have one battery i would say that you should get 2 days out of it... if you get more with out charging it i would consider that good. I would give it a little charge everyday with your car, keep it topped up.. then you may be able to push it 4 days.. if you have a solar panel then hook it up and it will supply a trickle charge to the batteries all day... even if it only adds 2 amp hours all day then thats two more than you had before... Dry camping is kinda like being stranded on a desert island... watch your water usage, battery usage ect, once you run out... the trip is over...lol.
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Old 07-19-2011, 11:52 PM   #17
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Anytime anybody has a new unit there is a feel out period to know how much you use it vs how much power the unit takes so it really is the old live and learn rule... some people think they conserve but don't other people won't use lights at all and say it lasts 5 days.... you need to know what your limits are and what your comfortable with.... if you conserve and still run out, pick up another 12 and run them parralelle to get double the storage. if one 12 lasts you 4 days.. you may not have any issues.
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Old 07-20-2011, 09:56 AM   #18
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snip........if I run jumper cables from my car (TV) battery to the RV battery and run the engine, I can get a much faster recharge? How long should it take to recharge a low 12V battery that way?
Rapidly,

Yes, but the length of time to recharge is based on the DoD (Depth of Discharge) of your PUP battery, and of course the charging source. Standard 12V Marine/RV batteries are designed for a DoD of 50% providing a modest amount of discharge/charge cycles, and "jump" charging off your TV battery under these conditions (DoD of 50% or lower) is fine......, BUT...., it should be noted that with any battery (TV, RV, Marine, Motorcycle, Deep Cycle, etc.,) the shallower the DoD average, the longer the battery life.

As 'Canucker' mentioned, we all have different dry camping and "AMP" consumption habits. If you find that your dry camping frequency is increasing, you may want to invest in a means of monitoring your battery DoD..., and as suggested consider upgrading your AMP storage capacity, possibly even looking into the advantages of a true Deep Cycle battery product.

Check out some of the Dual Battery systems installed by forum members over in the "Jayco Mods" section for some different ideas.

Prior to upgrading to my two 6V Deep Cycle batteries, I could 'solo' dry camp for four days with my standard 12V Marine/RV battery which included operating my power jack and slide....... but that's me. My original 12V Marine/RV battery was still in great shape after 6 years of service, but I did maintain it properly both in and out of use.

Bob
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Old 07-20-2011, 10:28 AM   #19
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It does, but at a much slower rate than using jumper cables off the TV's battery (taking advantage of the alternator output).

Bob
Ummmmm if you plug your umbilical cord into the tow vehicle it is the same as using jumper cables.. and less chance for a miss match problem...
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Old 07-20-2011, 10:35 AM   #20
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Ummmmm if you plug your umbilical cord into the tow vehicle it is the same as using jumper cables.. and less chance for a miss match problem...
I generally only see about 6-8 amps going to the battery when I am on umbilical - but I do agree it is a much safer and easier charging method.
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