DALLAS — Some in the U.S. solar-power industry are hoping a decision this week by President Donald Trump doesn’t bring on an eclipse.Companies that install solar-power systems for homeowners and utilities are bracing for Trump’s call on whether to slap tariffs on imported panels.The solar business in the U.S. has boomed in recent years, driven by falling prices for panels, thanks in part to cheap imports. That has made solar power more competitive with electricity generated from coal and natural gas.A green-technology …