Inverters are commonly a part of both grid connected and stand-alone renewable energy systems.
Inverters convert DC power from batteries or solar modules into usable AC power, normally 240V AC (single phase) or 415V AC (three-phase). Inverters are complex electronic devices and must be installed in relatively clean areas. Standards for inverters include AS 4777-2005, Grid connection of energy systems via inverters; AS/NZS 4763:2011, Safety of portable inverters; and AS/NZS 5603:2009, Stand-alone inverters — performance requirements.
Inverters may be either wall or shelf mounted. They can be large and heavy — a 5kW unit could weigh as much as 60kg.
Inverters can become very warm when operating at large power outputs and need suitable ventilation and cooling airflow. Insects often like to nest in the heat dissipation vents, so site your inverter carefully and check it often.
Inverters should be installed out of direct sunlight as direct exposure can cause them to overheat. They should be easily accessible in case they need to be electrically isolated in an emergency.
Install inverters where there is suitable ventilation, no direct sunlight and easy access.
Install inverters in an accessible place out of direct sunlight.
The DC currents in the battery leads between the battery and inverter can be very large. To avoid overheating and voltage drop, the leads must be of an appropriate size and kept to a minimum practical length. Many inverters are supplied with leads, which should be used wherever possible. Place the inverter as close as safely possible to the battery bank.
Lightning can damage inverters. The risk should be assessed by the designer and appropriate protection installed if required.
Only a suitably trained and qualified person can undertake AC hard wiring to an inverter.
