Solar inverters may be classified into three broad types:
SOLAR OFF-GRID INVERTERS
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.
SOLAR HYBRID INVERTERS
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 BACK-UP INVERTERS
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.
Pure sinewave output
Meets the MNRE certification compliance standards
Digital PWM / MPPT solar battery charging
Galvanic isolated output
Quiet operations of AC motors and fans
Flexible solar charging options
Intelligent switching from solar to mains electrical sources during low battery
Low and high battery voltage conditions.
Short circuit condition.
Fuse blown/MCB trip condition.