Stand-By / Off-Line / No-Break
In the presence of the electricity grid, they provide the direct connection to the utility network.
In the event of power cuts or large power surges, the inverter intervenes in a time of about 5-10 msec, taking energy from the batteries.
Pro: Technically simple and inexpensive.
Cons: Not suitable for professional systems and areas with critical power.
In the presence of the electric network they stabilize the mains voltage, within a range of about +/- 10%, through a stabilizer (Automatic Voltage Regulator).
In the event of blackouts or voltage variations exceeding the range, the inverter intervenes, in a time of about 2-6 msec, taking energy from the batteries.
Pro: Good value for money.
Cons: Not suitable for areas with very critical power supply.
Double conversion On-Line
In the presence of the electricity grid, they regenerate incoming voltage and frequency through a double conversion, supplying it to users in an ideal manner.
In the event of power cuts or large power surges, they supply energy through the inverter that is constantly in operation, without any intervention time.
Pro: They offer the highest degree of security.
Cons: Expensive as with professional electronics.