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I plan to build a hybrid installation, with LifePo4 bank and some cheap inverter (e.g. Anenji 11KW) with 2 MPPT strings support. If solar input won't be enough to cover needs, it will get some energy from the grid, however it will never "sell" energy since it's not a grid-tie inverter.

To get even more solar energy I plan to install solar panels in a multiple locations, e.g. fence, shed roof or even build shed outer walls directly from panels. Angle and shading will be irregular, so I can't efficiently feed it all to a single MPPT controller.

What are feasible ways to connect "irregular" solar input to existing hybrid installation?

a) I was thinking if I could use some micro-grid inverters (they're usually grid-tie though and I don't think I can connect to the output of the hybrid inverter). a2) Perhaps I could connect micro-grid inverters to a hybrid inverter which supports e.g. generator input... but it seems micro inverters usually can't start without grid.

b) Perhaps I could utilize multiple optimizers and actually connect that as an input to a hybrid inverter, but I am not sure about that.

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There are a few easy ways to hook up those solar panels in those odd spots to your existing system~ Doable options: Grab small off-grid MPPT charge controllers for each or each group of panels that perform differently—like the ones on the fence or shed roof—then wire all their DC outputs in parallel to your system’s DC bus. Each panel can chase its max power on its own, and this fits your off-grid setup perfectly. Use off-grid-specific PV optimizers—just don’t pick grid-tied ones—slap one on each panel, then wire them all to your system. Each panel gets independent power optimization, so you can mount ’em wherever you want. Group panels with similar conditions (like angle or shading) into 2 sets matching your inverter’s 2 MPPTs. It’s cheap, but if the panels in a group vary a lot, your power generation will drop a bit. The microgrid inverters you mentioned won’t work here—they’re for grid-tied setups, so they can’t start without the grid, and you can’t hook ’em up to your hybrid inverter. For multiple optimizers, just stick with off-grid-specific ones and you’re good to go~

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