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Motorhome Facts :: View topic - sky box vs FTA digibox, satellite, 12v, inverter c4
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506383 Post Posted: Mon Oct 20, 2008 9:02 am Thank this member for this postReply with quote Back To Top

solentviews Subscriber 31/01/2013 


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I got a Dreambox from Snelly when he first had them. So easy to use and no time lag when moving satellite dish. Came programmed with all the Free satellite channels. A dream to use, even for this technically challenged individual. Now just trying to talk myself into the crankup. When does the seasonal sale start?
Ian

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506407 Post Posted: Mon Oct 20, 2008 9:42 am Thank this member for this postReply with quote Back To Top

Roger7webster Subscriber 19/10/2012 


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Vennwood wrote:
Hi Wilse,

I bit late I guess but to answer your question on 12v verses Inverter I'd probably go for 12 volt, particularly if I didn't already have an inverter - it would keep it simple. If you already have one and need it on then it doesn't matter
In strict terms you are burning 12 volt power just to run the inverter (typically 0.5 to 1.0 amps) so if you are not running anything else then that's waste energy.
You need to find out the watts each receiver is taking then convert it back to amps at 12 volts.

Eg. 240v receiver takes 125w (125/12) = 10.42 amps (+ the inverter - say 0.75) = 11.17amps

12v receiver takes 60w (60/12) = 5 amps

In this example the 12 volt reciever needs less battery power. It could be the other way round though so you need to look at the wattage on both recievers

Hope this isn't too late and helps

Pete
Is this really correct? 11 amps is nearly 3KW
 
506418 Post Posted: Mon Oct 20, 2008 9:52 am Thank this member for this postReply with quote Back To Top

DABurleigh Subscriber 07/01/2014 


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Not at 12V it's not.

IMHO a modern 150W fanless inverter running TV equipment runs at 90% or greater efficiency. That's good enough for me and convenient.

Dave
 
506455 Post Posted: Mon Oct 20, 2008 10:34 am Thank this member for this postReply with quote Back To Top

Vennwood Subscriber 06/06/2012 


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As Dave says not at 12volts,

3kw (as in a kettle) would be 12.5amps AT 240 volts
3kw would be 250 amps AT 12 volts.

Dave - I agree to a degree about the inverter but you still have to buy it and there will always be an additional drain on the battery, albeit small by using a 150w inverter and it just adds a little more complexity to the system. As I said originally it all depends on the power differences of the receivers

Pete
 
506459 Post Posted: Mon Oct 20, 2008 10:38 am Thank this member for this postReply with quote Back To Top

Snelly Subscriber 25/01/2013 


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Re inverters, it goes back to the age old addage:

start with 12v DC, item runs on 12v DC = efficient.

Start with 12v DC, convert to 240v AC to then have the appliance convert 240v AC back to 12v DC = loss/inefficiency.

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 Dream box
506467 Post Posted: Mon Oct 20, 2008 10:52 am Thank this member for this postReply with quote Back To Top

Rapide561 Subscriber 02/02/2013 


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Hi

sorry to sound a bit dim, but I like some of the SKY channels - would the SKY card work in the dream box or would I need a SKY box alongside?

R

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506480 Post Posted: Mon Oct 20, 2008 11:05 am Thank this member for this postReply with quote Back To Top

DABurleigh Subscriber 07/01/2014 


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Pete, Shane, Russell,

Convenience/ complexity - I have one switch by the TV which simultaneously turns on and off TV, digibox and satellite controller. Yes you have to buy an inverter if you don't have one. They cost less than £20. They also will charge mobile phones, digital cameras, Ipods, etc.

Shane - the devil is in the detail in the electronics gubbins. A stabiliser can work just as an inverter by voltage upconverting and downconverting. How else does it deliver a constant voltage, as some TFT TVs require, from a voltage varying between 11.8V and 14.8V, say? Depending on the appliances, the efficiency of those circuits comes into play, too (look up posts by me on Grundig). So whether with a given appliance it is more efficient to use a stabiliser or an inverter, or run a dual-voltage appliance from one supply or another, depends on detail.

A Sky card will work in a Dreambox. It contravenes your Sky contract to do so, which is why many dealers don't offer this.

Dave
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