Offline Systems – This unit charges the battery while the mains is on and only switches over when the power fails. An offline system will only activate after the power fails, which means that it won't truly support your equipment as it will switch off in the meantime. An offline system tends to be inexpensive and more efficient than other UPSs as it isn't always on. It should be noted that offline systems are not suitable for critical loads.
Line Interactive Systems – Line interactive technology exists between offline and online. The load is fed from mains during normal operation, however, unlike an offline UPS, this technology incorporates filters to provide voltage stabilisation and help suppress spikes and transients.
Transformers enable a UPS to maintain a steady output voltage to critical systems – without switching to and from battery power – whilst the mains voltage is within the range of approximately +20% to -30%, resulting in far fewer load breaks and reduced battery wear.
Online Systems – In an online UPS, the batteries are always connected to the inverter, so it isn’t necessary to have a power transfer switch. When a loss of power occurs, the rectifier just drops out of the circuit and the batteries keep the flow of power steady and unchanged.
If the mains supply falls outside pre-set parameters (typically +10% to -20%) or fails entirely, the battery begins to discharge, and the load is unaffected.
The important thing to note here is that power always flows through the UPS – the only difference in the event of a mains failure is that the battery will discharge, so there will never be a load break.
We offer all three of the major types of UPS system, you can find them here.
If you have any questions about which UPS Systems would be best for your requirements, please contact us.