if for household then ok because extra you sell back to tnb provided u have hybrid inverter. for household you dont need solar battery because night u can use back tnb line.

1 1800w solar battery cost as much as a 345w 2m x 1m solar panel. so if you wanna save half the price then dont need to buy battery lo.

being setting up off grid solar power for my dad with battery. everything DIY so have to make sure read all the specs.

yes solar panel will degrade, but still will maintain 90% capacity after 10 years and 80% after 20 years. you need to do dusting too if solar panel is dirty.

for my dad 1kw off grid solar part cost around 7k+ with 4 solar gel battery 1800w.

useful for off grid and also during zombie apocalypse

lifepo4 200ah 12v each and 16 of those ? o mai, that gonna cost a bomb. but if 1.2kw is too slow to charge 16 of those batteries.