Can I use an AVR and a UPS together?

The connection order is always: wall socket, stabiliser, UPS, loads. The AVR corrects large and prolonged voltage deviations so that the UPS does not have to keep switching to battery. This helps in areas with low voltage in the evening or frequent fluctuations, such as at the end of a rural line, where a UPS on its own would waste battery cycles.

The combination is not always necessary. Many line-interactive UPS units already have a built-in AVR, and online UPSGlossary · UPS technologyOnline (Double Conversion) UPSA UPS that continuously converts incoming AC to DC and back to AC, so the load is always fed by the inverter with clean, stable power. units regulate their output voltage themselves. An additional stabiliser makes sense mainly when the mains voltage often falls outside the UPS input range.

Two practical tips. Size the stabiliser, with a margin, to cover not only the loads but also the charging current of the UPS batteries. And do not connect the AVR to the UPS output: it adds nothing there and may burden the inverterGlossary · UPS technologyInverterThe component inside a UPS that converts DC power from batteries back to usable AC power. with its transformer's inrush current.