Not necessarily. Micro-converters to step up from panel DC to a common DC bus, and then inverting from the common DC bus to house's AC bus is much cheaper than

Not necessarily. Micro-converters to step up from panel DC to a common DC bus, and then inverting from the common DC bus to house's AC bus is much cheaper than going straight from DC to AC at the panel. My house is wired up this way, with individual DC/DC maximum power-point trackers at the panel, and a central inverter.