Another topology to consider; a half bridge driving a 1:1 isolation transformer, the output from the transformer is full wave rectified and placed in series with the input supply.
Neat!
If it is a single secondary with full bridge, the current can be is positive and negative in the winding.
If it is center taped (is actually twice longer), each half winding will conduct for half period.
So, I think the losses in the copper are the same, so, better with 2 diodes. Same amount of copper in both cases, if it is center taped the section is half and the length twice.
This would also reduce the losses, a it is dealing with half the power. In this case I need to make it Vo=Vin.
The GTi (grid Tied inverter) complies with the grid requirements, without isolation. It has a isolation fault monitoring, that would disconnect the AC in case of leak current to ground.
I can't add inverters neither change number and orientation of panels, ans I need to comply with technical regulations.
I am allowed only to add "optimizers" (dc-dc) on the DC side.