I'm planning to add wireless leds to some figures that I have in a shelf. I know a little of electronic, but about coils I really don't know anything, so have many questions about this.

1-Atm want to buy this wireless power supply (24V/1A) and want to know if it's possible to attach more than one coil to it in parallel without reduce the max range.

2-For the extra coils, do the caliber of the wire matters? Can I use flat copper wire?

3-While comparing prices, found a store selling this kit. It's possible to spread the field in this way, without needing to connect all the coils to the circuit?

4-My figures have neodymium magnets in the feet and the shelf have a 1mm stainless steel sheet. Can this affect the effect of the coil?

5-Didn't find any references to the max voltage that the induction leds can tolerate, even when the leds were being sold alone. What's the average max voltage the lamp beads can tolerate, since I want to remove the led from one of them and add multiple wired 12V SMD 0805 leds in parallel.

 

1-Atm want to buy this wireless power supply (24V/1A) and want to know if it's possible to attach more than one coil to it in parallel without reduce the max range.

"ATM" please do not use "short language" this is an international forum and those with whom English is not their primary language might not understand.

2-For the extra coils, do the caliber of the wire matters?
Not much. Try to match then wire recommended by the manufacture for you best chance at success.

2B Can I use flat copper wire?
I think round would be better. Flat wire would be less efficient because of eddy current losses in a flat coil.

3-While comparing prices, found a store selling this kit. It's possible to spread the field in this way, without needing to connect all the coils to the circuit?

Only the energized coils will spread the field. This is because the field generated by each coil is only effective near the coil. Coils not driven don't do anything.

4-My figures have neodymium magnets in the feet and the shelf have a 1mm stainless steel sheet. Can this affect the effect of the coil?

Probably no effect unless they are large. You can experiment.

5-Didn't find any references to the max voltage that the induction leds can tolerate, even when the leds were being sold alone. What's the average max voltage the lamp beads can tolerate, since I want to remove the led from one of them and add multiple wired 12V SMD 0805 leds in parallel.

The LEDs are highly dependent upon particularities of their design and manufacturing process. You can only tell for sure from the data sheet or by trying you LEDs in the desired situation and seeing what happens.

I would keep small LEDs like the ones in the picture in the advertisement for the kit or 10 or 20 milliamps. Generally speaking the lower the current the more slowly they degrade.

 

The link appears to be for a coil only; not a power supply? The description in the ad doesn't make much sense.
Welcome to AAC!

 

I agree with post #3!! To be more specific, I call the ad a TOTAL FRAUD! First, a coil by itself is not a power supply of any kind. Next, a 24 volt, 1 amp, DC supply will not by itself create an AC magnetic field able to transfer energy as depicted in the advertising. So my evaluation is that every aspect of that advertisement is a fraud!!

In addition, for your application, a steel shelf will block the magnetic field that would transfer energy to the receiving coils.
So while the application is interesting, as it is described it is not possible. It may be possible to make changes that will allow wireless energy transfer to the images, but those changes are not part of what is described.