I have bought some little solar panels as a toy and they come without leads, manufactured only with conductive bars spaced few milimeters apart. To connect the

I have bought some little solar panels as a toy and they come without leads, manufactured only with conductive bars spaced few milimeters apart. To connect them to leads, you have to connect all these bars by soldering a strip, and that's nontrivial amount of solder. AFAIK most panels are connected this way.