I bought 3.5kw and a 10kwh battery in June and it’s amazing. Bills are 90% cheaper and it’ll pay for itself in 5 years with underwritten warranties for 25 years on the panels and 15 on the battery

For reference, 100W panels were running 66 cents/W when I did my build in 2023. Larger panels have always been cheaper per watt, but it means prices have dropped by up to 80% in just three years.