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wrote:
recommend a retail source or recycled source of 1xxx aluminum that is
solderable with standard flux and solder?

a suggestion was bus bars-are bus bars solderable?

IME aluminum is solderable if one cleans the surface *immediately* prior
to applying solder...IOW, heat the metal, scrape the area to be soldered
while hot and feed in the solder. It's a PITA, but marginally doable.

jak