I'm pretty sure you screwed up on soldering. Were you using electrical or plumbing soldering? If plumbing soldering, that would be a gross error as the connection will eventually corrode. Also, power connections should always, always be crimped unless it is a true weld connection. The reason is the solder's significantly lower melting point than copper is creating essentially a fuze by the lower melting point of solder. At least that is what NASA and Space Force engineers tell me. I know a few through the amateur radio community. In 10-20yrs you may know where to look for a failure point. Of course I am sure a lot the discussion is based upon plumbing solder typically having an acid core. If the solder is not acid core then you will probably be ok as far as corrosion.
