Most countries in the world use a supply of standard 230 V (phase voltage) and 400V (line voltage) with neutral cables at 50Hz or 60Hz. Or there might be a Delta grid pattern for power transportation and industrial use for special machines. And as a corresponding result, most of the solar inverters for house use or commercial rooftops are designed on such basis.
However, there are exceptions, this document will introduce how common Grid-tied inverters are used on this special Grid.
1. Split-phase supply
Like the United States and Canada, they use a grid voltage of 120 volts ±6%. Some areas in Japan, Taiwan, North America, Central America and northern South America use voltages between 100 V and 127 V for normal household power supply. For house use, the grid supply pattern, we call it split-phase power supply.
As the nominal output voltage of most Renac Power single-phase solar inverters are 230V with neutral wire, Inverter will not work if connected as usual.
By adding two phases of the power grid (phase voltages of 100V, 110V, 120V or 170V, etc.) connecting to the inverter to fit the 220V / 230Vac voltage, the solar inverter can work normally.
The connection solution is shown as below:
Note:
This solution is only suitable for single-phase grid-tied or hybrid inverters.
2. 230V three phase Grid
In some regions of Brazil, there is no standard voltage. Most federative units use 220 V electricity (three-phase), but some other – mainly northeastern – states are on 380 V (tree-phase). Even within some states themselves, there is not one single voltage. According to different uses, it can be delta connection or wye connection.
To fit for such electricity system, Renac Power provides a solution by LV version Grid-tied 3phase solar inverters NAC10-20K-LV series, which include NAC10K-LV, NAC12K-LV, NAC15KLV,NAC15K-LV, which could use with both Star Grid or Delta Grid by commissioning on inverter display (just need to set inverter safety as “Brazil-LV”).
Bellowing is the datasheet of the MicroLV series inverter.
3. Conclusion
Renac’s MicroLV series three-phase inverter is designed with low voltage power input, specifically tailored to small commercial PV applications. Developed as an efficient response to South American market needs for low-voltage inverters above 10kW, it is applicable to the different grid voltage ranges in the region, which mainly cover 208V, 220V and 240V. With the MicroLV series inverter, the system configuration can be simplified by avoiding the installation of an expensive transformer which adversely affects the system’s conversion efficiency.