Eishkom

Hi Esteemed Members I am a newbie here looking for a bit of guidance, I hope to learn from you all. I am in a three bedroom flat in a complex, looking to install a backup system to run my house during load-shedding. I am looking to install a basic system that will run my lights and a few plug points to run the TV, Soundbar, Wifi + Router, External Monitor when working usually during the day - TV will be off mostly when this is on - and possibly charge the laptop here and there. Basically a very small load as kitchen and everything else will be off. I estimate my load to be about 350W. I don't want a plug and play solution as I want to run the lights as if no load-shedding has happened. I also cant install any solar panels as I am in a complex. I am also keen to go Lithium for longer battery lifespan. This is where I need help I am thinking of getting a 24V, 3KwH inverter and a lithium battery pack for this. I have not clue as to which battery to buy nor which inverter. I am looking for a cost effective solution and would appreciate any recommendations from the knowledgeable members. I look forward to the recommendations.