FoxESS Community - Owners & Installers Forum

I had quotes to install 42kwh, 10kw inverter in Victoria
aud 6500 for ac coupling
aud 7500 for dc coupling

current inverter is a 5kw growatt inverter. aith 6.6kw solar it seems it can be controlled via custom signal but seems abit of a hack.

planning to go on a plan like Amber where I would need to be able to curtail any output to the grid.

So the only option is dc coupling? Or is it possible for the fox inverter to connect to the growatt inverter to cut any export for instance?

To do what you are trying to do you would need DC coupled panels to the Fox system, that's the only way it can hard limit the amount of export by derating the MPPT's

Having DC coupled would improve your efficiency slightly as you'd only have one set of losses from the single inverter.

I went with DC coupling.

have 2 backuped up circuits to kitchen fridges.

however its a manual process, on w power outage, have to manually switch on the board from grid to battery explicitely.

is tehre any way to get automated / full home backup on power outages?

You'd need some sort of ATS (automatic transfer switch) to be installed. Sometimes these are called a 'gateway'. Fox does one called the EPS Box, although you can also install third-party ones as well. I don't know how earthing is usually done in Australia, but here in the UK you would frequently need to install a local earth rod or something similar, instead of relying on the grid-earth.

I have a similar-ish question.

I am set up with AC Coupling and installer is coming back to add a transfer switch.

I am battling with Google to find out if the KH9.9 will accept solar charge from on the EPS port that would allow me to charge in an extended power out scenario. (and without having to DC couple)

Does anyone know if it is possible?

Reason is I have a not very old SolarEdge system that manages the panels when they get shade, are under warranty and I don't want to rip apart a good system.

Apparently you can keep the solaredge optimisers by using a 'solaredge KEY1000' to unlock them from the inverter, so that they operate independently (only if your optimisers support IndOp mode). You'd lose the per-panel monitoring and safe-shutdown but keep the optimiser functionality. So a bit of a mixed bag.

I don't know if the EPS system can be used with an input like that though.

DC coupling:

it seem sin 'force charge' mode, when battery is full, it would still use grid and turn off the solar...

what is the correct approach so that when full we still use solar for home load or export anyway?