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[Kevin Wood]

I'd hope a 110 ah battery would run it for a whole week! If it's a 12v powered TV rather than a mains set on an inverter it should only take 1 or 2 amps at 12 volts.

Kevin

[LFF64]

It may be worth asking the site if they have battery charging facility on site some do then you would not need to worry about charging from the car. I would say a split charge relay would be your best option as per the caravan  

[Kevin Wood]

Good point. Or take your battery charger along and ask them if you can plug it in somewhere to charge it up.

I'd be surprised if a 110ah battery didn't last you the whole holiday though.

Kevin

[Auto Addict]

It won't last long if it's running a colour tv.

[Taxi_Driver]

I'd hope a 110 ah battery would run it for a whole week! If it's a 12v powered TV rather than a mains set on an inverter it should only take 1 or 2 amps at 12 volts.

Kevin

It mains powered.....and takes about 50W +  5W for the invertor which is about 4.5amps at 12v, obviously as the battery voltage starts to drop then the curent will increase.....im not quite sure how long a 110ah will last bearing in mind the invertor shuts down when the battery voltage gets to 10v.

[Martin_1962]

I am making a 12V lead for my TV

[Taxi_Driver]

I am making a 12V lead for my TV

I presume a 12v to mains ?

If so and its just for a portable tv.......you can buy 75w inverters off fleabay for around £5-£6 +postage

[Kevin Wood]

Ahh, OK.  A mains TV running from an inverter is a different proposition. Much more thirsty.

Kevin

[Martin_1962]

I am making a 12V lead for my TV

I presume a 12v to mains ?

If so and its just for a portable tv.......you can buy 75w inverters off fleabay for around £5-£6 +postage

Caravan TV uses an external power supply so unplug that and plug in lead

[Taxi_Driver]

It won't last long if it's running a colour tv.

I tested the idea on a ropey 47ah car battery that carnt hold its charge for long......it powered the tv from the inverter for 2.5hrs.....thats where i came up with 5-6hrs or poss longer  with a 110ah leisure battery

[lee4206]

If you only want to run a 12v tv try this  http://www.machinemart.co.uk/shop/product/details/jump-start-900/path/battery-chargers-engine-starters-2
i have one that i use for camping and it will run 2 portable dvd players for 4 hours plus recharge my camcorder (using 300w inverter) a couple of times and run a 12v light all night  without being recharged. ( and it still has enough power to jump a car )..
plus it comes with a mains and car charger so you can keep it charged at all times.

[Taxi_Driver]

If you only want to run a 12v tv try this  http://www.machinemart.co.uk/shop/product/details/jump-start-900/path/battery-chargers-engine-starters-2
i have one that i use for camping and it will run 2 portable dvd players for 4 hours plus recharge my camcorder (using 300w inverter) a couple of times and run a 12v light all night  without being recharged. ( and it still has enough power to jump a car )..
plus it comes with a mains and car charger so you can keep it charged at all times.

Thanks for the info   but my portable tv is mains powered and im looking at about 55w continous consumption....which i doubt that device would be capable of for very long  

[Taxi_Driver]

It may be worth asking the site if they have battery charging facility on site some do then you would not need to worry about charging from the car. I would say a split charge relay would be your best option as per the caravan  

Ive looked into this  

Split charge relays (from web sites ive looked at) seem to agree that the main feed cable to the battery should be about 40amp and fused at 30amp....which is sound advice.....which would be ok on normal car batteries.....but this will be a leisure battery (110ah) and recomended charge rate is "bench charge at 7amp" which i assume to be max charge current....if so....using a split charge relay isnt the way to go unless you can limit the current.....my mains bat charger....which i think maybe the way to go using an inverter max charges at 7amps on high setting