What Does an AVR Do (and Why It Is Not a UPS)
Q: What does an Automatic Voltage Regulator do for me?
A: An Automatic Voltage Regulation device (AVR or AVS — automatic voltage stabiliser) keeps the grid supply voltage feeding the load within ±10% of the 220 VAC nominal, even if the upstream grid varies by as much as +20% / –40% of nominal. Most decent AVRs also include filtering circuits to attenuate noise on the grid supply side.
Important caveat: an AVR or AVS is not a UPS. It has no inverter and no battery. When mains fails, an AVR drops the load. Use an AVR for sites where voltage instability is the problem but outages are rare; use a UPS (with built-in or upstream AVR) when outages also need to be covered.
Connections
- Automatic Voltage Regulation — referenced, source: https://standbysystems.co.za/ups-batteries-questions-and-answers/