A solar inverter, converts the variable direct current (DC) output of a solar panel into a utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical network. It is a critical component in a photovoltaic system, allowing the use of ordinary commercial appliances.
Solar inverters are pure sine wave inverters with inbuilt charge controller with LED/LCD display ,starting range from 400 VA
Solar inverters may be classified into three broad types:
- DSP Based design with absolute and stable Sine Wave Output Voltage and Frequency.
- State-of-the-art MOSFET based PWM technology.
- Battery high protection.
- Thermal protection.
- Deep Discharge Battery Charging.
- Solid State Solar Battery Charging.
- Battery Low and High Protection.
- Intelligent Battery Monitoring.
- Save Power when mains and Solar both are present.
- Stand-alone inverters, used in isolated systems where the inverter draws its DC energy from batteries charged by photovoltaic arrays. Many stand-alone inverters also incorporate integral battery chargers to replenish the battery from an AC source, when available. Normally these do not interface in any way with the utility grid, and as such, are not required to have anti-islanding protection.
- Grid-tie inverters, which match phase with a utility-supplied sine wave. Grid-tie inverters are designed to shut down automatically upon loss of utility supply, for safety reasons. They do not provide backup power during utility outages.
- Battery backup inverters, are special inverters which are designed to draw energy from a battery, manage the battery charge via an onboard charger, and export excess energy to the utility grid. These inverters are capable of supplying AC energy to selected loads during a utility outage, and are required to have anti-islanding protection.