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I’ve got a non digital TV on the boat. Is there a 12 volt freeview box available or do I have to buy a new TV with freeview? Going to the west country soon and I know you need digital. What are you west country guys doing on the boat now that you only have digital?
PS you do not have to buy the expensive caravan/motorhome/boat TV’s cos their 12V. Lots of the household TV’s are actually 12V running from a 240V transformer -but not all. Find one by looking at the transformer output or TV input and if its 12V throw the transformer away, find a plug for your TV and connect to your boat 12V system – with a fuse.
Hi
Sagem DVB Digital Freeview Set Top Box 12v / 240v are on E-bay I have one on Last Chance and works very well
Graham
Last Chance Medway@achilles/medway wrote:
PS you do not have to buy the expensive caravan/motorhome/boat TV’s cos their 12V. Lots of the household TV’s are actually 12V running from a 240V transformer -but not all. Find one by looking at the transformer output or TV input and if its 12V throw the transformer away, find a plug for your TV and connect to your boat 12V system – with a fuse.
Are there any amperage issues?
Do the 240V transformers also regulate the amps for any given TV set?
Thoughts?
I connected the boat 12v supply direct to my TV which uses an external 240v/12v transformer and it killed the TV. I would not recommend it!
@CaSam wrote:
Are there any amperage issues?
Do the 240V transformers also regulate the amps for any given TV set?
Thoughts?
Not sure what you mean by amperage issues. The transformer will regulate the voltage to within a few percent of the required voltage (12v?). The transformer does not regulate current (amps) – this depends on the draw from the tele – how bright the screen is, how loud the sound etc.
When the TV is connected to an unregulated 12V supply (i.e. straight to the boat battery) there is a danger that the voltage can be much higher than 12V – say up to 14.5V when charging on shore power – and this can ‘blow’ some TV power supplies (see previous posting). However, in my experience that is the exception. and may have been an incipient fault in the TV power supply rather than a design limitation. My TV (17″ flat screen Matsui) has been connected to the boat supply for more than 10 years without problem.
@Vela wrote:
I connected the boat 12v supply direct to my TV which uses an external 240v/12v transformer and it killed the TV. I would not recommend it!
I made a simple mistake of using a “generic” power adapter once with a TV….. the Volts were correct but the amps did not match….. that was the last time that set worked!
Hence my question….
An old science teacher of mine used to say it is not the volts that will kill you, it is the amperage…… never did really understand it!
Giving this thread a bit of a twist, is there an easy way to convert / better understand the voltmeter reading into a guide into how much longer stuff will work?
The batteries are in Amp hours, the meter is in volts, most stuff works at 12V, but the meter often shows up to 13.9….. how low can the reading go before stuff stops working? What is likely to stop first / last?@Vela wrote:
I connected the boat 12v supply direct to my TV which uses an external 240v/12v transformer and it killed the TV. I would not recommend it!
I connected mine to the 12v supply and it works fine EXCEPT, when i turn the engine on/off the sound goes for a while and then comes back on. Looks like each tv is different so I’m going Sagem box as if I buy a new tv with freeview it might blow.
@Lastchance wrote:
Hi
Sagem DVB Digital Freeview Set Top Box 12v / 240v are on E-bay I have one on Last Chance and works very well
Graham
Last Chance MedwayHave you found this works ok with the variable voltage you get on a boat. I find my domestic battery volyage varies from 11.9 to 12.6 dependent on usage. When charging it goes up to 14.4v. Can the Sagem handle this? The one I’ve seen on fleabay is 240v with a transformer dropping this down to 12v constant. About £30.
@Lastchance wrote:
Have you found this works ok with the variable voltage you get on a boat. I find my domestic battery volyage varies from 11.9 to 12.6 dependent on usage. When charging it goes up to 14.4v. Can the Sagem handle this? The one I’ve seen on fleabay is 240v with a transformer dropping this down to 12v constant. About £30.
I’ve used a Sagem box for the past 10 years working from 12.4 to 14.5V without problem. It may not be the same model but there’s a good chance the design parameters for the power supply are the same.
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