I don't like the all-in-one units, not only because they are overpriced, not only because their modularity is limited, but also because they're designed to be disposable if anything breaks.
Best bet is to spend time on an off-grid forum and find out what inverters are best, which batteries, etc. Build it to your needs rather than be pigeonholed into whatever these all-in-one units happen to offer. It will be lower cost, and if anything breaks, you can replace what's broken rather than huck the whole thing in the garbage.
Finally, I would never consider a dinky ~1kWh battery as a "generator".
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