Individual solar cells are somewhat difficult to solder to. Self-adhesive metal stained-glass tape makes for the easiest soldering job--the tape holds itself in place while you solder. Use electronics solder that contains 2% silver. One side of the cell is (+), the other (-).
rain check (plural rain checks) (idiomatic) Any voucher or note from a merchant to a customer to provide an item the merchant has run out of at a later date for the item's current price, or (in a more literal sense) to provide a service at a later date.
DEFINITION of 'Bounced Check'. A slang word for a check that cannot be processed because the writer has insufficient funds. A bounced check will often be returned to the writer along with a penalty fee for non-sufficient funds. Passing bad checks is illegal, and the crime can range from a misdemeanor to a felony, depending on the amounts involved and whether the activity involved crossing state lines.