Quote: jago68 wrote in post #16

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I have a 2017 without 12v sockets, just three pin. What is an inverter fir the tv ?

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An inverter will enable you to generate 230VAC mains from your 12VDC battery. It is not specifically for televisions but for anything which requires mains voltage whilst off-grid. Be warned however, an inverter can rapidly drain your battery! Even assuming 100% efficiency, 2 Amps drawn at 230V will pull over 38 Amps from your battery (most modern inverters have between 80% and 90% efficiency so the load on the battery will be even higher). Rather than trying to run a standard mains rated television through an inverter, you would be far better off investing in a TV specifically designed for camping & caravanning such as Avtex. These can connect directly to your 12V system without the need for an inverter.

Quote: jago68 wrote in post #16

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There was previously a solar panel fitted but it was removed and a little white box left behind with usb sockets in it and on the display it says what the battery charge is

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Without more information it is difficult to say what the white box is; if you are lucky then it could be a solar charge controller in which case all you would need is a suitably rated solar panel to provide the power. On the other hand it may merely be a battery charge indicator in which case you would need to install a charge controller along with the solar panel. You cannot connect panels directly to the battery without using a charge controller to regulate the current.