Most grid-tie PV systems are useless when the grid fails. They shut down at the very moment that the power is most needed. This does not need to be the case. One way to ensure that a PV array does not become stranded during utility outages is to make it AC COUPLED back up system.

AC Coupled Back-Up Power Systems utilize a battery-based inverter/charger to “fool” the Grid-tie inverter to “think” that it’s still connected to the utility by offering it with a pure sine wave AC signal.

After the GT inverter “qualifies” the AC signal, it starts producing AC power which is sent to the AC output of the battery-based inverter/charger. The power is used to power loads and recharge the batteries.

Sigineer’s battery-based AC coupled inverter chargers have below benefits:

1 help solar installers to easily retrofit an existing grid-tie solar system into a battery backup off-grid system without rewiring the solar arrays or adding other components.
There no need to be concerned about cable loss in long, expensive low voltage cable runs in comparison to DC-coupled system
2 increase the overall inverter capacity by paralleling AC coupled inverter with the grid-tie inverter.
So if you had a 5 kW solar inverter and a 15 kW battery inverter, your total output would be 20 kW.
The modification is simple and straightforward: connect the AC output of the grid-tie inverter to our inverter charger AC output, and connect the grid power to our inverter AC input.

Our AC coupled inverter with work in two modes:

1 Battery mode
The inverter’s pure sine wave AC output will synchronize with grid tie inverter to support loads, the excessive solar production will go back into battery thanks to Sigineer’s unique bidirectional circuit design.
When battery voltage goes to high alarm, our 60/62.5hz freq switch allows the inverter to switch the freq to 62.5hz to temporarily shut off the grid-tie inverters.

2 AC mode
When the battery voltage goes low, the inverter is able to take AC power from the utility to charge batteries.
Currently, only 3 models of Sigineer Power’s inverter chargers are built with 60/62.5hz freq switch and are suitable for AC coupled system.
These models are

Note: These AC coupled inverter chargers are OFF grid, they can’t send excess energy to sell back to the grid, they only output AC to wake up your grid-tie inverters.

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