Take a look at the Victron gear. I have one of their smaller 12v inverters - they’re nicely made, well engineered gear. Certainly not the cheapest, but there are some reputable eBay vendors who do a better price.
The MultiPlus is particularly interesting, since it can take the output from a generator or solar panel and use it to charge the battery, or “top up” the output from a solar inverter or generator with power from battery to cope with a larger load. This is pretty useful if you’re running from a small generator that takes a few seconds to pick up when a large load is suddenly added. The MultiPlus will use battery power to make up the difference while the generator catches up, then go back to recharging the battery.
This is the smaller version, but they make bigger ones:
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