Line Interactive Smart-UPS (SU, SUA, SMT, SMX) products with an "I" in the suffix of the part number are designed for a nominal 230v input. (Ex: SMT1500I, SUA3000XLI, etc). Some units can also be configured for optional nominal input voltages of 220v and 240v. Although transfer points can be widened to allow the unit to function online with even higher input voltages, the unit is not designed for this and will ultimately run into issues.

Problems in this type of configuration include:

• Short runtime due to repeatedly switching to battery operation
• Unintentional load drops due to discharged batteries
• Shortened battery life due to frequent discharges
• UPS Not turning back on after a power outage due to high input voltage
• Increased wear and tear on the UPS hardware by continuous mode switching

Using a 230v "I" unit in a 277v environment is not supported or recommended.

The web page for each product will list a nominal input voltage, and if any other input voltages are acceptable they will be listed as "Other Input Voltages".  We do not currently offer a Smart-UPS product for use in 277v environments.

The specification for "Input voltage adjustable range for mains operation" on our product pages is the full range of operation. This includes the use of Boost and Trim with the UPS voltage transfer points configured to their widest setting. This full range may be encountered on occasion during power events and is not meant to indicate normal online operation of the UPS. Smart-UPS products are designed for use in environments supported by their Nominal Input Voltage or any listed "Other Input Voltages" only.