How long will the battery last

[Chadders]

I have a new leisure battery and 120w solar panel also new. Thinking of the possibility of using some basic smaller sights and using a pitch without hook up. Also cost saving exercise.
What is a reasonable time for the battery to last running the tv lights etc for about 4 hours each evening. Also pros and cons of using the fridge on battery or gas and also heating and hot water?
Thanks

 

[Hutch]

Your fridge will only run on Gas, off Grid, ( no EHU) most modern vans will use 12 volts to power, heating and hot water, , water pump for showers, sink etc., on the control sides.
If your internal lights are LED then they will draw a small amount of power.
The TV, is the biggest power draw, depends if it is a 12 volt or 240 volt going through an inverter ie 12vt volts to 240 volt.
Many folk can last a week plus, sitting outside the caravan with a headlamp on their head reading a book.
Others have all the lights on , etc. the only way to check is to go to a EHU pict and not use the power, just use the van.

 

[Mr Grumpy]

We go off-grid nearly all year round.
Charging the battery obviously depends on the weather, the amount of daylight hours, cloud cover etc. With a bit of thought you can be off-grid for several weeks at a time.
Heating, hot water, fridge run on gas. Far more efficient. We actually find the fridge cools quicker on gas.