Has any one ever ac coupled with MPP solar
 

Has anyone ever used a Mpp inverter like the lv6048 or 5048 to create a grid & have the grid tied inverters come on . These seem like a cheap way to have a backup inverter.

The tesla powerwall does this - it will act as "the grid" to a regular microinverter/string inverter system.

a bunch of "how" it does that is discern-able here:
https://www.tesla.com/support/energy...pp/go-off-grid

I'm not currently aware of another system that does this, but I'd like to be.

Some MPP inverters can supply backup power during the day using only PV connected to the PV DC input. No batteries needed!
https://www.youtube.com/watch?v=n9KCl8SAh5Y
The only other major brand I'm aware of with that feature is SMA. But while SMA requires a bunch of extra hardware if you decide to add batteries later, MPP just works with batteries.

I have the schneider 4048 it will ac couple & has firmware to work with the solar edge to curtail but a frog got in it and burnt up a piece .So i plan to buy another ,but for backup i am thinking of getting one of the mpp solars & making another string strictly off grid.

My battery i just got is a 10kw heavy as a boulder i put on the outside of my old chimney. Also have the nissan leaf batteries about 7 kw. The voltages of the two batteries are different was hoping i could ran them in parallel :( .

I know the schneider 4048 & the 6048,are ac coupled compatable with my solar edge grid tied . I just have a interlocking breaker i have to throw to make this possible so it does this safely also is required by power company. Same as a backup generator just less noisy.
I think midnight solar & victron is also compatable with ac coupleing so they curtail the power output of the grid tied inverter.