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Topic: How long will my gas bottle last?
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24/2/2011 at 9:07am
Location: Keswick Outfit: Bailey
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Bit of a health warning first on this guide but when calculating how long a battery will last you need to appreciate that a battery capacity decreases as the rate of discharge increases. So a simple formula is not a precise science.
So, generally, to work out how long your battery will last, assuming that it is fully charged, divide the amp hours by the actual amperage being used. In your case the battery has an 85amphour rating so divide 85 by the amps being used. A compact fluorescent lamp will use between 0.5-1.5 amps (according to my book); wall lights 0.8. So. Let’s say you are using 2.5 amps with your lights. The battery will last 34 hours. So the lights will probably stay on all night for all of your stay. As you will be charging up each day with the generator you will have no problems. You can even put the tele on and still have plenty of power.
The following may be useful (I stole it so you might as well)
If you have an inverter so that you can use standard household appliances and you know the amperage rating of the appliance, then in order to convert that to its equivalent DC amperage rating multiply the amperage by 10. Say you have a TV that consumes 1.5 amps of AC current and you are running it off your batteries through an inverter. In order to power that TV, you will be using 15 Amps of DC current (1.5 Amps (AC) x 10 = 15 Amps (DC)). From here you can do the same calculation as you did above to determine total Amp Hours. Therefore, if you plan to watch TV 3 hours a day, then you will consume 45 Amp Hours total.
As for the gas...how long is a piece of string? How cold is it? What time do you change form gas to electric in the morning etc? So many variables. Having said that you may be surprised at just how long it does last. Maybe best to carry a spare cylindar. However long it will last the laws of England indicate that it always runs out in the dark when you need it most.
Phil
Post last edited on 24/02/2011 09:15:24
------------- If you're not on a fell your wasting your feet and for 2014 it's.......Feb Castleton Mar North Yors Moors; Apr Sutton on Sea; May Thirsk; Jun Clapham/Riverside (Lakes); July Wharfedale; August Crakehall; Sept Knaresborough; Oct Wirral Park/Clitheroe
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01/3/2011 at 4:57pm
Location: Wigan Outfit: VWSharan. Sport 442.
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Quote: Originally posted by kazbat on 01/3/2011
Hey Guys Thank you all so much, like I said I am new to tourer caravaning and the caravan came with two blue 4.5kg butane bottles so I just renewed them. If I swopped onto propane then I believe I would I have to change the regulator?. weight is also a massive issue. We have a tiny two berth and we need to carry some of the equipment in the caravan. We have read all about the maximum load weights etc and we are fairly confident that we have done our sums right but it leaves very little in the way of extra poundage. Thanks again guys you have been a big help ;) Kaz
Unless we get a really cold snap, the Butane should be OK, but I would exchange for a Calor Propane Lite, (they are lighter), when one is empty, and get a regulator for it at the same time. The Propane regulator is only about £6'ish. Swap to a Propane bottle when the second Butane bottle is empty, and you are sorted for all year round vanning. We can't be bothered faffing with having blue for Summer, and red for Winter, so use Propane, (red), all year round.
As an aside, I'm ususally asked how long my diving bottles last, and I get some confused looks when I reply that it depends how long I stay down, and how deep I go,
Regards,
Jim.
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