Likewise, the MPPT varies the ratio between the voltage and current delivered to the battery, in order to deliver maximum power. If there is excess voltage available from the PV, then it converts that to additional current to the battery. Furthermore, it is like an automatic transmission.
On the Supreme Court of the United States, Associate Justices Potter Stewart and Anthony Kennedy have been described as swing votes between the two factions of the court. In the United Kingdom, the  Essex man ,  Worcester woman  and  Holby City woman  are examples of personifications of swing voters.
At this point, as a political matter the final vote to end a filibuster is no different than the vote for final passage. (So, 60 is the new 50. Technically, 60 is the new 51, since a bill needs 51 votes to pass, but Reid needs only 50 senators. He can rely on Joe Biden, as president of the Senate, to break any tie votes.). At this point, the John Kerry rule kicks in.