If you have that many stripped wires to tin, you can use a tub of flux and a solder pot. Dip the wires into the flux, then quickly dip it into the solder pot. Perfectly tinned end with no plastic melting. Really hard to mess up vs a soldering iron, a wire, and solder wire.
You can even dip multiple wires into the flux and solder bath at the same time, as well as use the flux tub again before you solder the tinned wire to the contact.
You can even dip multiple wires into the flux and solder bath at the same time, as well as use the flux tub again before you solder the tinned wire to the contact.