I don't have any experience with the Jackery/Bluetti/EcoFlow/etc. units. I have, however, built my own. Two, in fact. Both work exactly as designed.
The first one I built used AGM batteries, and thus was too heavy to take boon docking but it has proven great for those all-too-frequent power outages at the sticks-n-bricks. The second one uses a LiFePO4 battery, thus is much lighter, and will go camping with us in future. The lithium one with it's 500 watts of solar panels and the folding hand truck weighs just about 100 lbs, and provides 300 Ah and 2200 watts continuous AC power. With that much capacity, I don't even care if it rains for a couple days in a row.
As long as you sized your unit correctly, you should expect to be well served.