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Old 01-13-2014, 12:13 PM   #1
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New Shamrock/Roo

Hello again, & great forum! We picked up our new 2014 Forest River Shamrock/Roo 21SSL last week. Traded off a Carson Titan/Funrunner. I am excited to drag her up the mountain. It is incredible how much room the slide out adds. The ground clearance in great with the off road tires. My only question is.....what size generator do I need to power the heated mattress pad?

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Old 01-13-2014, 12:20 PM   #2
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Nice! The heated matresses are great - we love them, even though at first they felt like they weren't doing anything. They do work. They are only around 100 watts, so any generator should cover that.

Never checked the draw, but they are 12V, not 110V, so I think the amp draw is going to be high enough that they would kill the batteries pretty quick. 100 watts at 12V is over 8 amps, if I did that correctly. If you have a genny though, should be no problem.
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Old 01-13-2014, 02:26 PM   #3
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Congrats on your 2014 Forest River Shamrock/Roo 21SSL.
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Old 01-13-2014, 02:37 PM   #4
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Nice! The heated matresses are great - we love them, even though at first they felt like they weren't doing anything. They do work. They are only around 100 watts, so any generator should cover that.

Never checked the draw, but they are 12V, not 110V, so I think the amp draw is going to be high enough that they would kill the batteries pretty quick. 100 watts at 12V is over 8 amps, if I did that correctly. If you have a genny though, should be no problem.
heated mattresses are NOT 12v but are 110v AC only. you would have to plug them into a big inverter and have a big battery bank to run all night.
that's why we only use them when we have electric hookups.
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Old 01-13-2014, 02:47 PM   #5
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Congrats! You are right the slides make all the difference in the world. We have a heated mattress as well and it is 110v not 12v at least in our Shamrock 25RS.
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Old 01-13-2014, 02:59 PM   #6
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heated mattresses are NOT 12v but are 110v AC only. you would have to plug them into a big inverter and have a big battery bank to run all night.
that's why we only use them when we have electric hookups.
Guess I had the bunk fans confused with the heaters... Losing my mind, but the good side is at 110v, the amp draw would only be .83A at 100 watts. With an inverter and a couple batteries, you wouldn't have to run the generator all night long to use them...
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Old 01-13-2014, 03:14 PM   #7
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Thx all. Some very good info in here. I do spend a lot of time boondock camping in the Rocky/Big Horn/ and Teton Mts. I thought I knew a lot but, browsing these forums I am learning more and more every time I visit. Thx again all.
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Old 01-13-2014, 04:44 PM   #8
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I'm curious how the F150 tows it. I have a 21ssl and pull it behind a diesel excursion.

She sure catches the air, 'sho 'nuff.

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Old 01-13-2014, 04:57 PM   #9
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It towed my older heavier toy hauler very good even up the steep Mts. The Shamrock is well under the 11,200 lbs my truck is rated for.
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Old 01-13-2014, 07:02 PM   #10
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Ford also factors in the frontal area of the trailer and what packages you have. I understand all the numbers and stuff but man 11k on a hitch behind a half ton would be interesting at best.

http://www.ford.com/resources/ford/g...rv&tt_f150.pdf
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