Battery Backup for a Grid-Tied system

[SunEagle]

I will second jflorey2's answer to the part about fooling your existing inverters into thinking the grid is still working. Unfortunately the answer is NO.

You need a different type of inverter that will redirect the energy from your panels to a battery charging system which can then be used for your loads. The solaredge equipment you have can't do that.

[Mike90250]

The software and sensors in the inverters are desigened to prevent what you want to do, sadly. Seems a shame to let the panels sit idle in the sun.
The easiest way is to install a Generator Transfer Switch, and use a modest sized generator to keep the fridge going, lights and a radio.
Adding batteries means charge controllers, more switches lots of batteries and a new Bi-Modal (also called Hybrid) inverter. And you get to replace batteries every 5-8 years, just because,

[jflorey2]

I would like to add battery backup and generator backup.

That's pretty easy - just buy a generator. I have had good luck with the Honda EU2000i for small loads. You may want a transfer switch as well to transfer your house loads to the generator.

If you want to add a battery backup then you can either buy a dedicated UPS and switch the input between grid and generator, or build it out of pieces. For example, an Outback FX inverter plus a battery bank plus the usual protection/wiring devices.

Can I still take advantage of existing inverters. E.g. let them convert to 240V, just 'fool' them into thinking they're converted to the grid to continue producing (e.g. disconnect the main breaker).

No. Your only option there is something like the SMA Secure Power option; you could then use the 120VAC to feed your UPS. But it will not produce full power - it maxes out at 2000 watts.

[NetComrade]

I have a grid ties system based on solaredge optimizers and inverters with solarworld panels. 21 280w modules connected to SE6000 and 14 280w modules connected to an SE3800
I would like to add battery backup and generator backup.
Can I still take advantage of existing inverters. E.g. let them convert to 240V, just 'fool' them into thinking they're converted to the grid to continue producing (e.g. disconnect the main breaker).
Outside of regulations. Help me understand the best way to proceed.

Thanks,