Our GIS Hybrid system offers the benefits of grid-tie efficiency and power outage protection in the event of black/brown-outs. The peak shaving and tarrif optimization capabilities that are able to be programmed into the GIS hybrid system are not explained below.
The basic premise of the GIS is that you are combining a grid-tie solar array and inverter with a small battery inverter that runs the house. The grid tie system supports the house loads and exports to the grid as required. The house switchboard runs with the battery inverter in standby mode much like a UPS on a computer. The batteries normally stay fully charged (unless the grid power cost is very high then the system is programmed for minimal grid support) until there is a blackout or brownout (where the mains voltage drops below a safe level). Under black/brown-out conditions the battery inverter keeps the house running from the battery bank and the grid tie inverter is automatically re-assigned to support the house loads and charge the battery bank. During the blackout the solar array and the batteries need to be able to sustain the load during the day and night (respectively). The size of the solar array and the batteries and the size of the load will determine how long the system will keep running before needing intervention such as a generator or load reduction.