If you want off-the-shelf, check out Will Prowse’s channel on yt, he explains in great detail the good and bad points of a lot of commercial batteries, inverters, panels, and updates his recommendations as new ones come out. It really depends on what your power needs are, but in general, today’s 48V server rack LiFePO4 batteries are pretty safe and easy to set up, don’t take up much room, can discharge even down to 0% for thousands of cycles, and can charge quickly.
The site I mostly end up back at for detailed technical information, bugs, updates, and DIY support is his forum, diysolarforum.com . There are a number of technical support employees from different solar vendors who have accounts there and occasionally respond to questions about their companies’ products, and there are forum rules to prevent them from marketing there. I’ve seen a few companies raked over the coals in those forums for poor phone or email support/response times, and some have even improved their support in response.