Warpspeed
Solar Wizard
Unfortunately the main reason many inverter designers go to high voltage dc (from battery voltage) and then PWM that, is to save the cost and size and weight of a large 50/60Hz transformer.
As the whole motive of doing it that way is for cost saving, many of these inverters lack the sophistication of a fully bidirectional high frequency inverter, and as a result they become rather electrically fragile.
Certainly its possible to do it properly, but that requires extra complexity which pushes up the cost of manufacture.
Low cost definitely sells inverters.
Anything really good becomes far too expensive to compete successfully in the marketplace.
As the whole motive of doing it that way is for cost saving, many of these inverters lack the sophistication of a fully bidirectional high frequency inverter, and as a result they become rather electrically fragile.
Certainly its possible to do it properly, but that requires extra complexity which pushes up the cost of manufacture.
Low cost definitely sells inverters.
Anything really good becomes far too expensive to compete successfully in the marketplace.