Choosing the right UPS size doesn’t require any special technical background — it comes down to a simple calculation most people can do in a few minutes with the equipment they already own.
Start by listing every device you want the UPS to protect, then check each one’s power rating, usually printed on a label on the back of the device or in its user manual, expressed in watts. Add these numbers together to get the total load you need the UPS to support.
Once you have that total wattage figure, look for a UPS rated comfortably above it — most guidance suggests adding at least 20 to 30 percent headroom rather than buying a unit that matches your load exactly. This headroom matters because running a UPS right at its maximum capacity shortens its lifespan and reduces how long the battery will actually last during an outage.
Runtime is the second consideration, separate from capacity. A larger-capacity UPS doesn’t automatically mean longer runtime — that depends on battery size specifically. If you need to keep working through longer outages rather than just save files and shut down, look specifically at the runtime specification for your expected load, not just the VA rating.
Finally, consider whether any of your equipment is genuinely sensitive to power fluctuations — servers, medical devices, or networking equipment that simply can’t tolerate any interruption. For that category of equipment, sizing correctly matters less than choosing an online double-conversion unit in the first place, since the technology itself, not just the capacity, is what protects against voltage instability.
Intex’s lineup spans 650VA through 10KVA in both line-interactive and online double-conversion technology, making it straightforward to match capacity to your calculated load — browse the full range on the Power Backup Solutions page at Intex UAE.