10 Questions You Should to Know about Standalone AC coupled inverter

Thanks for the input everyone. My system uses optimizers on each panel that communicates with the grid tied inverter which complicates the project and apparently not much works with Solar Edge inverters. I don't even know how the strings are set up and my installer is not much help. The combiner box is mounted on my garage roof under one of the solar panels. If I remove the Solar Edge inverter I will also need to remove the optimizers in order for the panels to work with another inverter. I just want to use my existing system and add batteries so there will be power when the grid is down and use batteries at night during the lighter months of solar production. I do get 1:1 with grid export and I would like to keep that going if possible. With such a large array I am finding it to be rather expensive to add in the batteries and new hybrid inverter(s) to safely handle all the power coming in from the array. I may be forced to look at a stand alone off grid system or just install an inverter that uses AC charging to absorb the solar and charge the batteries acting as UPS for power outages.

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https://mcelectrical.com.au/blog/sunny-boy-storage-review/

I just know that any commercial solution is quite expensive. A sunnyboy usually runs in the $3kusd. Not worth the investment for just a partial return. Most of us here are DC coupled, with a few that have both ac (grid-tie) and dc coupled (off-grid) on a separate system with two sets of panels. Others here have a hybrid system where the inverter is capable of battery storage. So the panels come into this hybrid inverter where the batteries are also attached to it. This hybrid will then charge the battery and send it to the grid the excess. You will need to completely replace your Fronius in this case.

For the PIP, it's not a grid-tie device but off-grid. So a seperate sub panel is a must. If you can figure out how to charge through some external programming, then maybe it's possible. So if you're willing to get your hands dirty, and have a current sensor at the panel hooked up to a raspbery pi and then have the pi control the state of the pip, to be on charging mode and battery mode, etc.

Even if you get the Hybrid version of the PIP, which is a grid-tie hybrid that allows you to tie into the grid, you still need some sort of meter to tell the hybrid to switch from charging to battery mode, unless you plan to replace your Fronius with this.
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I'm not too familiar with these ac coupled storage so I can't really offer any more assistance. Here's a few more links on AC coupled storage that may help.I just know that any commercial solution is quite expensive. A sunnyboy usually runs in the $3kusd. Not worth the investment for just a partial return. Most of us here are DC coupled, with a few that have both ac (grid-tie) and dc coupled (off-grid) on a separate system with two sets of panels. Others here have a hybrid system where the inverter is capable of battery storage. So the panels come into this hybrid inverter where the batteries are also attached to it. This hybrid will then charge the battery and send it to the grid the excess. You will need to completely replace your Fronius in this case.For the PIP, it's not a grid-tie device but off-grid. So a seperate sub panel is a must. If you can figure out how to charge through some external programming, then maybe it's possible. So if you're willing to get your hands dirty, and have a current sensor at the panel hooked up to a raspbery pi and then have the pi control the state of the pip, to be on charging mode and battery mode, etc.Even if you get the Hybrid version of the PIP, which is a grid-tie hybrid that allows you to tie into the grid, you still need some sort of meter to tell the hybrid to switch from charging to battery mode, unless you plan to replace your Fronius with this.

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