Grid tie with battery backup Christmas Island

Can a battery backup be integrated with a grid-tie system?

Resolving that issue requires integrating a battery backup alongside your grid-tie system that does not feed power back into the grid. There are a few different ways to achieve it. One of the more common methods is called AC Coupling.

How does sunny island recharge a battery?

That lets loads be disconnected but Sunny Boys remain connected so discharged battery gets recharged in the morning. Sunny Island can't recharge from grid (or generator) unless Sunny Island can generate AC output, so needs a way to make sure loads are less than generation.

Does Sunny Boy work with a grid tie inverter?

That is not for use in a grid-tied system. So all the hassle is in setting Sunny Boy, not Sunny Island. It is likely any other AC coupled grid tie inverter has the same issue; would possibly need to be updated to current firmware and have frequency-watts enabled. The Sunny Island/Sunny Boy system seems to work quite well.

How does the sunny island connect to the utility grid?

The Sunny Island connects to the utility grid when the power requested by the loads is within the limits determined by the following parameters: If the parameter "232.08 GdMod" is set to "GridFeed", the Sunny Island can feed into the utility grid, regardless of whether parameter "232.42 GdPwrEna" is enabled or disabled."

Will sunny island back feed the grid?

They said that the Sunny Island will only back feed the grid with excess energy that is produced by the PV system that cannot be used to charge batteries. It will not allow discharging of batteries back into the grid.

How can a battery based inverter be used in a grid-tie system?

There are a few different ways to achieve it. One of the more common methods is called AC Coupling. This is a system configuration that involves adding a battery-based inverter and a battery bank into an existing grid-tie system as well as a critical loads panel.