Despite IRA incentives, inverter manufacturing in the US is still slow with companies hesitant to manufacture here. Some hesitate because they don’t fit into the narrow definitions in the IRA (and many parts are sourced overseas). IRA definitions of different inverter types also raise barriers – for example, microinverters can receive the largest incentive per-watt in the inverter category, but they must be both less than 650 W_AC and connect with just one solar module (this then only applies to Enphase).