Can I replace or hybrid LA battery with Li battery

[Kai]

I bought a small portable 150AH 12V Li battery with 12.6V AC charger. Once fully charged it can run 12V TV over 3 hours. I am wondering if I can plug in 12V port in caravan and/or by turning off LA battery isolator so that it replace or provide extra power for off-grid. Next question is if I can connect to 100W solar panel in parallel with LA battery via PWM controller?

 

[IanB1485]

I have a 280W Li ion battery ( with a 3kW inverter connected to it) The combination is too big to fit inside the caravan battery compartment it lives in the awning and whilst the inverter only has a 13A outlet I have made up a short cable and interface box ( to connect the earth and neutral wires together and a ground spike) and it goes into the mains inlet connector in the caravan , thats one option , I am now in the middle of running 10mm cables underneath the caravan from the leisure battery and fitting a housing on the left hand side similar to the one which has the BBQ outlet and fit a commercial 20A connector ( fused) this would couple both batteries together. the solar controller will charge both up together. The minor difference in voltage between the batteries is not a problem. My inbuilt 20A 2/3 stage charger charges up the Li-ion battery no problem when on grid , it just takes longer. If you are worried you could always disconnect one terminal off the leisure battery.

 

[JTQ]

I bought a small portable 150AH 12V Li battery with 12.6V AC charger. Once fully charged it can run 12V TV over 3 hours

Have you miss typed this and meant it can run a 12V TV for nearer 30 Hours? If a 150 Ah battery last just 3 hours, it must surely be knackered, as the TV can't realistically pull getting on for 50 Amps, 600Watts.

 

[Kai]

Have you miss typed this and meant it can run a 12V TV for nearer 30 Hours? If a 150 Ah battery last just 3 hours, it must surely be knackered, as the TV can't realistically pull getting on for 50 Amps, 600Watts.

It is cheap, bought from Aliexpress, I doubt it has 150 AH. But it is enough for me to run TV 3 hours every day. I need to source a solar panel for it.