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Old 12-06-2010, 09:35 PM   #29
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Try fleece sheets. They are great. Made a big difference in my life....
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Old 12-07-2010, 08:23 PM   #30
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I charged my battery up a second time, plugged in the mattress pad and this time I kept the battery plugged in to charge all night at the same time. The digital readout dipped immediately to 65% battery life, then cycled back and forth (the pad was set on three) between 95%, then 50%, slowly going lower and lower till it hit 0 again sometime during the night. I guess I am assuming this is not a regular full size battery, it is one of those backup, jump start things by Diehard. I still have not tried it over at the trailer where I have two large full size batteries hooked together and shore power to back them up. Unfortunately I don't have a digital set up there, I think it reads four stages of battery life with a set of four lights. I just want to know if anyone thinks that 6.3 amps for the mattress pad is excessive for my set up in the trailer or should I send it back. I really like how warm it keeps me, but perhaps an electric blanket and fleece sheets might work better. Any ideas would be greatly appreciated....
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Old 12-07-2010, 10:25 PM   #31
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How many amps/hour can most batteries put out?
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Old 12-08-2010, 08:57 AM   #32
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12v heat pad

Quote:
Originally Posted by cclarkego View Post
I charged my battery up a second time, plugged in the mattress pad and this time I kept the battery plugged in to charge all night at the same time. The digital readout dipped immediately to 65% battery life, then cycled back and forth (the pad was set on three) between 95%, then 50%, slowly going lower and lower till it hit 0 again sometime during the night. I guess I am assuming this is not a regular full size battery, it is one of those backup, jump start things by Diehard. I still have not tried it over at the trailer where I have two large full size batteries hooked together and shore power to back them up. Unfortunately I don't have a digital set up there, I think it reads four stages of battery life with a set of four lights. I just want to know if anyone thinks that 6.3 amps for the mattress pad is excessive for my set up in the trailer or should I send it back. I really like how warm it keeps me, but perhaps an electric blanket and fleece sheets might work better. Any ideas would be greatly appreciated....


Carol:
I repeat the suggestion to get a timer. It will give you the chance to control the amount of usage, depending on the battery capacity you have.
There are lots available, but this is an example.
You could set it to run 5 min every hour and I think it would be great.(unless it's really cold)
Dave


PROGRAMMABLE 12V DC TIMER SWITCH - 15 Amps
Part Number: BRX1224PTS1
Price: $62.00 - IN STOCK
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This 7 day digital programmable timer is ideal for use in any 12V DC appliance which requires automation.
It can be configured to switch at up to 6 different times during a 24 hour period. In addition, it can be programmed to operate on a wide variety of days. eg. Daily, Week days only, Weekends only, Every second day, or selected group of days.
The BRX1224PTS1 allows for Switch-on and switch-off times to be set for each program. i.e. allows a different "on" duration for each program.


The timer has three modes of operation. In the "auto" mode, the timer automatically switches at the pre-programmed times. In the "on" mode, the switch is always on regardless of the timer program setting. In the "off" mode, the timer will not switch regardless of the program settings. The mode of operation can only be changed when power is applied to the switch.

In the event of a power failure, the switch retains its program data via a long life rechargeable NiCd battery.

- Voltage: 12V DC
- Max Total Load: 15A Resistive
- Standby consumption: 0.002 A
- Dimensions: Height 10cm, Width 7cm, Dept 6cm
- 24 Hr Programming from 1 minute to 23:59/day.
- Weekly & Daily Programming.
- Up to 6 events per day for a maximum of 42 ON-OFF events per week.
- Accuracy: less than 0.25 second per day
- Operating temperature: 0 ~+50 C
- Includes two different mounting brackets
- Battery backup: Rechargeable NiCd >100 Hours
- Manual override eliminates the need for an additional helm switch.
- A 15A fuse is strongly recommended for each installation as it will assure a long life for the timer as it will avoid overload of the system. SOME OF THE APPLICATIONS THIS TIMER WILL WORK:
- 12V DC Timer for well pump
- 12V DC Timer for solar Irrigation systems
- 12V DC Timer for diesel fuel polishing systems
- 12V DC Timer for LED signs
- 12V DC timer for deer feeding devices
- 12V DC timer for bird feeding devices
- 12V DC Timer for attic exhaust fan.
- 12V DC timer for solar water fountain and many other applications
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Old 12-08-2010, 09:28 AM   #33
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People sure have different needs for warmth or cold during the night. We went to a baseball game in Phoenix one time and the A/C in the park seemed to be set for around 80˚ (it was 108˚ outside). Though we thought it was a little warm, people were wearing sweaters. The other side of this is—when I was very young, we had a maid from Iceland because my mother was sick a lot. She go out shoveling snow when it was pretty cold wearing only a sweater (yes, I never forgot her because she was so hot a 7 year old noticed).

There seem to many solutions to keeping warm—dogs, 12 v. mattress pads, electric blankets, memory foam, comforters, flannel or fleece sheets. Not suggested was a lover or moving further south. You could also spend some time in the mountains get used to the cold (the Icelandtic way).

Carol, that battery sounds like a regular car battery and it is not built the same as a deep cycle battery. It provides initial very high amps, but it doesn't last. You can't easily compare the two types of batteries. It sounds like you are not using the trailer yet. If you use the mattress pad in the trailer, the batteries should last the night. If you are plugged into a 12 v. receptacle in the trailer, and you have shore power it will run off the converter anyway, not the batteries.

As for what setting to use, you'll have to experiment. It might be good to start out fairly high before you go to bed (either kind of "high" might work), and then turn it down low when you go to bed.

Gene
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Old 12-08-2010, 09:40 AM   #34
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Clark

Either an electric blanket or a mattress pad will use a lot of battery capacity heating up the bed, but once it is heated up and you are in it, it will only use as much energy as needed for heat loss. This is why a good down comforter is important to keep warm and minimize the battery power needed to feed the mattress pad or electric blanket throughout the night. Just a guess, but I suspect the energy required to heat the pad or blanket up over 30 minutes of time may be more than the energy needed to keep you warm for your entire sleeping period if you have some good flannel sheets and a good down comforter to keep the heat loss to a minimum.

Remember, all the battery power you are using is going to heat. The faster you use it the quicker the bed will heat up, and the more you insulate the bed once it is warm, the less heat you need to keep it at a constant temperature (and a constant comfort level for you).

Dan
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Old 12-08-2010, 10:34 AM   #35
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The more I think about it you definately don't need a timer. You need to run the "bed warmer" on high to bring it up to temperature and then switch to low once you go to bed. You may find that you need to turn it off if you have adequate insulation (a down comforter on top to minimize the heat loss).

Dan
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Old 12-08-2010, 11:47 AM   #36
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Thank you everyone for your suggestions, I really, really appreciate them...
I am relieved to know that if I am hooked up to shore power that the converter will be providing the energy to run the pad. I just didn't want to ruin my batteries in the trailer. I plan to use it on high to warm the bed, then turn down to low. I do have a down comforter to take over there when I move into it. Right now I have a sleep sack there which is like a large sleeping bag with a winter and summer side to it so you can flip it according to the seasons. Combined with the down comforter and the dog and mattress pad, I think it will all work out. Oh, and flannel sheets too.
Thank you all again.........

Carol
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Old 12-08-2010, 04:00 PM   #37
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Quote:
Originally Posted by cclarkego View Post
How many amps/hour can most batteries put out?
A deep cycle group 27 battery has approximately 100amp/hours ( if there are 2 you have 200amp/hours )

Your jump start thingy probably has about 20amp/hours

Big difference , and the charger only has enough power to charge the battery , nothing like the converter in the trailer.
In short , you are not running a viable experiment using the jump starter and it's built in charger to run the pad .

remember you should only use about 50% of the batteries capacity before recharging.
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Old 12-08-2010, 05:40 PM   #38
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I had assumed that my portable battery was a regular type battery with a lot more amp hours. Usually I would use it for small things like charging my computer up while boondocking and never let it go down beyond 50%. This was just an experiment to see how the mattress pad worked but I guess I was dealing with apples and oranges...
Thanks for the additional info!
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Old 12-08-2010, 05:43 PM   #39
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One more question just to be sure I am on track...
So when I am plugged into shore power, anything I run on 12Volt is going through the converter and bypassing the batteries?
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Old 12-08-2010, 06:21 PM   #40
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yes, the converter will put out in the 34-55 amp range depending on the unit. that booster pack probably has a 7-17 ah rating. what does it sat the amps output is? my 300a booster has a 7ah battery and my 800 amp has a 17ah. some units can go higher.
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