Primary-election voters Tuesday approved the expansion of a renewable-energy tax break that backers say will help businesses and spark the expanded use of solar energy in Florida. But while the measure had support from an array of groups, they are divided on an unrelated solar amendment on the November general-election ballot that could lead to a major political fight. The proposed constitutional amendment approved Tuesday was known as Amendment 4 and was placed on the ballot by the Legislature. It is designed to extend a residential renewable-energy tax break to commercial and industrial properties. Shortly after the polls closed, the measure was more than 10 percentage points above the required 60 percent threshold needed for approval of constitutional amendments. The preliminary results indicated that the measure, which backers say will spur growth in solar and renewable energy, was supported in almost every county.