Which Power Management Topology
This isn't a 'use an IC' type of problem. You're asking for a 500W high-voltage inverter, which is a board- or box-level solution that involves safety type approvals.
In this case, if this is your first foray into the market, please consider an off-the shelf inverter / step-down pair from a reputable vendor like Schneider, Alpha, etc.
I also suggest that you use AC. This has some implications for safety, especially breakers and the possibility of using galvanic isolation for your hardware.