5kVA 208V UPS Systems for 30A L6-30R Circuits
A 208V 30A circuit with an L6-30R receptacle supports up to 5kVA — the 80% continuous load rule limits a 30A breaker to 24A continuous, which is 4,992W at 208V. Four platforms cover this capacity across line-interactive, online, isolation, and lithium topologies.
Four platforms — find the right one for your application
This capacity tier introduces a topology not available at 120V — the isolation UPS. The TX91 is the right choice when power quality and electrical isolation matter as much as battery backup. For straightforward backup power, the P80g and P91 cover the range from cost-effective to fully conditioned. A lithium 1U option arrives December 2026.
Line-interactive topology with AVR voltage regulation. Convertible rack/tower form factor. External battery packs extend runtime. The most economical 5kVA 208V option for deployments where online double-conversion is not required and upfront cost is the primary constraint — branch offices, light commercial IT, and non-critical infrastructure.
Online double-conversion — zero transfer time, continuous power conditioning regardless of utility conditions. Convertible rack/tower form factor. External battery packs extend runtime. The standard 5kVA 208V online UPS for network infrastructure, AV systems, and distributed edge deployments on dedicated 30A circuits.
Online double-conversion with an integrated isolation transformer — providing galvanic separation between the utility feed and the protected load. The TX91 is the right choice when facility electrical noise, grounding instability, or shared circuits with motor loads are affecting sensitive equipment. Also provides voltage step-down from 240V to 120V or 208V output. Available in 3.8–10kVA — the 5kVA point sits within this range.
A 1U 5kVA online lithium UPS at 208V — combining the J90 platform’s LiFePO₄ battery chemistry, switchable outlets, remote reboot capability, and 50°C operation at 5kVA capacity. Designed for shallow racks and distributed edge deployments where power density and long service life matter. Shipping December 2026.
All 5kVA 208V platforms compared
| Platform | Topology | Battery | Form factor | Ext. runtime | Best for |
|---|---|---|---|---|---|
| P80g-5000 | Line-interactive | Lead acid | Rack/tower | Yes | Cost-sensitive IT, branch offices, light commercial |
| P91-5k | Online | Lead acid | Rack/tower | Yes | Network, AV, critical distributed infrastructure |
| TX91 Series | Online + isolation | Lead acid | Rack/tower | Yes | Lab, industrial, noisy electrical environments |
| J90 5kVA | Online | Lithium | 1U + 1U rack | Yes | High-density racks, edge, long service life Dec 2026 |
Typical runtime at 5kVA · 208V
Runtime depends on actual load. A 5kVA UPS running a 1500W network stack runs significantly longer than the same UPS at 4000W. External battery packs are available for the P80g, P91, and TX91 for applications requiring extended runtime beyond the internal battery.
Need help selecting a 5kVA 208V UPS?
UPS sizing, runtime planning, topology selection, isolation UPS guidance, and circuit compatibility — from Xtreme Power engineering specialists.