We've dealt with each component of the system so now we can plan the wiring to link them all up.

The wiring overview image shows the component connections in an off-grid system. Direct current (DC) generated by PV arrays may be directly linked to the inverter to be converted into alternating current (AC). Wind turbines can choose either current type but if AC is used, a rectifier bridge is used to convert output to direct current which is supplied to the inverter and battery bank.

The second image shows the contrast of a grid-interactive system that sells surplus electricity to the utility while functioning as an emergency power backup during grid power failures. The feed coming from the wind turbine, PV panel, battery bank, charge control, energy meter, inverter circuits and diversion load uses direct current similarly to an off-grid system.

Both systems use AC connections between the house supply panel and the inverter for standard home electrical wiring.

There is an important difference between AC and DC wiring: their components – such as wires, fuses, connectors and switches – are not interchangeable. DC wire sizes are much larger to carry much higher current (due to the lower voltage). Thus, each component must be reviewed separately.