I'm looking into two EG4 inverters: the FlexBOSS18 and the 18kPV-12LV All-In-One Hybrid Inverter. I can't find significant differences between them other than their maximum power handling. I currently have an off-grid setup with a 6480W panel, a 30kWh battery, and a 5000W inverter. I'm interested in grid-tying my system because I generate excess energy in the spring and fall and want to feed some of that back to the grid to reduce my energy costs. I also want to know if Victron offers a hybrid inverter that can do this, as their product page doesn't mention grid feeding.
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One important thing to consider is the service connection costs and whether your utility will compensate you for the energy you export. For example, in my area, it's a $44 monthly fee just to stay connected, and I only get credited $0.03 per kWh for any energy I send back to the grid, which resets annually. Regarding Victron, as far as I know, they don’t support grid export in the USA—but they might be working on it.
I did my research too, and thankfully I found that my area has no fees for grid export and offers a 1:1 buyback. It's unfortunate Victron hasn't made much progress on this.