Batteries are ultimately at this time not a lifetime purchase but you can buy 10yr warranty lithium batteries. Look at ohhmu, battle born, Dakota lithium for example. You do have to be cognizant of cycles and discharge / storage levels / etc.
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Hobo tech is great! He gets it .I'm currently shopping for solar generators and came across this guy on Youtube. He usually has some discount codes and links below the vids or at his website. His reviews are thorough.
https://www.youtube.com/channel/UCVsNMiYQkqwIq_gd0rTJF9g
https://duckduckgo.com/?q=HOBOTECH&t=brave&ia=web
I think his battery pack and computer, ect., is about 5-6’ tall , 3’ wide.
You would not need batt to last whole house 2-3 days because the sun comes out every 12 at least....longer at times , blah blah.
Bought the Rockpals 250W inverter, Amazon had a heck of a deal on it. $169 Delivered. I couldn't resist. Now I need solar panels. ( The unit can charge via car, wall AC , or Solar) I am half way home on few lamps and Wi-Fi for my upstairs in my home when the power goes out. ) Should be great for camping / Fishing as well.