SOUTH PORTLAND — The owners of the Howard Johnson Hotel at 675 Main St. are seeking a zoning change that would allow them to install a solar array that would greatly reduce the hotel’s electricity costs. The $900,000 project would be installed on 1.5 acres behind the hotel, on a wooded parcel wedged between the Maine Turnpike connector road and Landry Village, a rental complex owned by the South Portland Housing Authority. The 900 Canadian solar panels, installed in five rows, would generate 354,033 kilowatts hours of electricity annually and reduce the hotel’s electricity costs by $53,000 per year, hotel General Manager Suresh Gali said during a City Council workshop Monday evening. The hotel spent $89,974 on 747,800 kilowatt hours of electricity last year, Gali said. The hotel’s owners want to rezone the 1.5 acres from residential to limited business uses, like the hotel’s parcel.