By Andreas Rinke and Sarah Marsh BERLIN (Reuters) – Building a lithium-ion battery factory in Germany, Europe’s top car producer, had seemed like a no-brainer for Northvolt. But a new U.S. law offering hefty subsidies to local manufacturers of green technology has given the company pause for thought. Chief Executive Peter Carlsson said that under the Inflation Reduction Act (IRA), Swedish-based Northvolt could get up to 800 million euros ($836 million) in U.S. state aid to build a factory making the batteries used in electric vehicles. That is roughly four times what the German government is o…