Copper, founded by MIT graduate Sam Calisch, has developed an induction kitchen range with a 5-kilowatt-hour lithium iron phosphate battery that plugs into standard 120-volt outlets, eliminating costly home rewiring. The 30-inch range has shipped 1,000 units with a New York City Housing Authority agreement for 10,000 more, while the company raised $28 million to scale production and recently piloted a program in California to provide grid power from its home batteries during