I'm always wary of pre-packaged kits, because they often cost a lot more than the parts would cost if purchased individually. Basically, you're paying a hefty premium for having someone else pre-select the parts.
I'm even more wary of any system which is billed as a "solar generator". The power output of these systems is rarely stated the same way as a conventional fuel-fired generator (i.e., continuous power output), inevitably leading to disappointing results. Many of these "generators" are targeted at the solar "newb" who probably isn't aware of their limitations.
IMO, the best approach is to find a company that sells a wide variety of solar equipment, and then seek their advice for your particular requirements. Even if you don't buy their stuff, you'll still get some feel for what items to shop for from other suppliers.
One of my favorite solar equipment suppliers is
Backwoods Solar - They've been around for several decades, have decent prices, great customer service and a knowledgeable staff.
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