Alexey Bartosh
It will give 2-2.4 A of current from the force, with an output voltage of 5V, this is 10-12 watts of power. The power of conventional hoods is 150-200 watts on average.
What do you think, 12 watts, at least in some scenario, will be able to pump the desired 400-600 m³ of air? I don't think so. It's not just "weak", it's nothing at all. It's like connecting a couple of PC coolers... Honestly, don't even try. If we are not talking about a power bank, but about a phone battery, even more so. Their current output is small.
If on business, then here you need to come up with not ready-made solutions, but collect from separate modules. For example, an assembly from 18650 3s lithium cans (3 in series, parallel until the required capacity is reached), by the way, they are are used in the power bank, but here you need to use not 3.7V - 5V, but a normal 12-220 inverter for 400-500 W and power it from this assembly. But they will sit down relatively quickly, constantly charge, it is either to remove them or to stretch the cable with the charger to the installation site. You can also use a car battery or unattended (as on uninterruptible power supplies), but the essence will not change.
You will be wasting money comparable to calling a competent installer-builder.
What is the problem, even with the repair done, to break into the chimney to connect the NORMAL hood? Any decent craftsman will do this with minimal damage. And if they are unavoidable, buy a built-in hood and build it into a beautiful wall cabinet. The cable for connection should be laid behind the plinth and neatly behind the furniture or somewhere in any other convenient place to place the socket for its connection. You can lay it yourself, there are even special skirting boards with a channel for cable routing. If you don't know how to do it yourself, then a NORMAL (not a swindler) electrician will take about 1000 rubles (+ - 500) for this.
This way you will get a GOOD solution that you will use and will not think about charging batteries or buying new ones on a regular basis.
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