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I just ordered a Bluetti AC100 for Christmas. I’d like to know if I spent the same amount of money, around $800, could I get a better system by building it myself? What specifically would be better? I understand I can upgrade a system more easily if it’s DIY. But what about specific features...

I'm looking to upgrade my Yeti 400. It only has 60w of solar panels hooked up to it. Its now at least 6 years old and doesn't work great. Usually it's close to dead and it isn't being used much. I always wanted to have a system that works for my engel refrigerator while camping, charging kids...