Ikea is installing electricity-producing solar energy panels on the sprawling roofs of 10 more of its stores, including a 2-year-old one in Tampa. The solar panels, each about the size of a dresser mirror, will generate enough juice to power 154 houses. Ikea won't disclose financial details, but it's not enough to light up and cool the store. By comparison, the Republican National Convention next August in Tampa will require enough electricity to power 7,000 homes. Once installation is complete by summer, Ikea will have solar generators on the roofs on 33 of its 49 U.S. stores. Like most big-box stores in Florida, Ikea uses recordings of birds chirping danger calls to chase seagulls off its roofs. Birds rarely land on the fixed panels at other stores because they get as hot as a frying pan handle. "We were a bit wary of how it worked when we first tested solar," said Ikea spokesman Joseph Roth. "But we found it's really pretty simple technology."