Higher-Capacity Online Backup Power for Critical Rack Equipment
The WattBox WB-UPS-OL-1500-8 is a 1500VA online double conversion UPS designed for AV racks, network closets, security systems, structured wiring areas, control systems, and other sensitive electronics that need continuous conditioned power.
It includes 8 built-in UPS-backed outlets, allowing routers, switches, NVRs, control processors, streamers, computers, and other suitable rack devices to connect directly to the UPS. Four critical-load outlets help prioritize the equipment that should remain powered longest during an extended outage.
Best Use Cases
- Network closets: Helps keep routers, switches, modems, firewalls, gateways, and core network equipment stable during outages and power disturbances.
- Security camera systems: A strong fit for NVRs, DVRs, PoE switches, routers, and surveillance support equipment.
- AV racks: Useful for processors, streamers, control devices, media servers, distribution equipment, and other sensitive rack components.
- Smart home systems: Helps protect controllers, hubs, bridges, automation processors, and supporting network equipment.
- Small business systems: Good for offices, studios, retail locations, conference rooms, and equipment areas where unexpected shutdowns can interrupt operations.
- Expandable-runtime installations: Supports compatible external battery packs when the internal runtime is not enough.
Who Should Buy This?
This UPS is a good choice if you need to connect several rack devices directly to one online double conversion UPS and cannot risk even a brief transfer delay when utility power fails.
It makes particular sense for customers who need more battery capacity than the 1000VA model, 8 built-in outlets, four critical-load outlets, pure sinewave output, a front LCD, computer-based configuration, graceful shutdown, and the option to expand runtime later.
Who Should Not Buy This?
This is probably more UPS than you need if you are only protecting one modem, one router, or another very small load. A compact line-interactive UPS may be more economical for basic equipment.
This is also not the correct model if you specifically need native OvrC monitoring, OvrC load shedding, or remote outlet management. This is the non-OvrC WB-UPS-OL model. For an OvrC-compatible installation, consider the WB-OVRC-OLUPS series paired with a compatible WattBox IP power conditioner.
Customers should also avoid treating the 1500VA rating as a guaranteed 1500W output. At 120V, the official output rating is 1500VA / 1300W. If your load is close to that limit, or you expect future expansion, consider the 2000VA model instead.
Large power amplifiers, appliances, heaters, laser printers, and power tools may have high or variable current demands. Confirm the actual equipment load before connecting these types of devices.
Compatibility and Technical Notes
- UPS topology: Online double conversion for continuous inverter-supplied power.
- Capacity class: 1500VA.
- Output at 125V: Up to 1500VA / 1430W.
- Output at 120V: Up to 1500VA / 1300W.
- Output at 115V: Up to 1500VA / 1270W.
- Output at 110V: Up to 1500VA / 1200W.
- Outlet count: Includes 8 built-in UPS-backed outlets.
- Critical-load outlets: Four outlets are designed to prioritize critical equipment and preserve additional runtime.
- Transfer time: Zero transfer time from AC operation to battery operation.
- Output waveform: Pure sinewave output in battery mode.
- Output voltage: Supports selectable output voltage settings including 100V, 110V, 115V, 120V, 125V, and 127V AC.
- LCD monitoring: Displays load, estimated runtime, battery condition, input and output voltage, frequency, current, alarms, warnings, and fault information.
- Local management: Includes PC software with USB and RS-232 connectivity for configuration and monitoring.
- Network management: Optional SNMP support is available for compatible network-management installations.
- Graceful shutdown: USB communication can instruct a compatible computer to save files and shut down properly during an extended outage.
- Rack size: 2U rack-mount design.
- Dimensions: Approximately 17.24 inches wide, 3.46 inches high, and 20.08 inches deep.
- Weight: Approximately 42.99 lb with the internal batteries installed.
- Internal batteries: Uses four 12V / 9Ah sealed lead-acid batteries.
- Recharge time: Approximately 3 hours to recover to 95% internal-battery capacity under the specified charging conditions.
- Runtime expansion: Supports up to five compatible WB-UPS-EBP-18AH48V extended battery packs.
- OvrC: This model does not provide the native OvrC pairing features of the WB-OVRC-OLUPS series.
Installation Considerations
Before ordering, calculate the total wattage of every device that will connect to the UPS. Use the watt rating that applies to your selected output voltage and leave reasonable capacity headroom for future equipment, startup behavior, and better runtime performance.
For a typical 120V installation, plan around the published 1300W maximum output rather than assuming the UPS can continuously support a 1500W load.
Decide which devices belong on the four critical-load outlets. Core equipment such as the modem, router, firewall, main switch, NVR, or control processor will usually be more important than secondary streamers, displays, or nonessential accessories.
Confirm that the rack has 2U of available space, at least 20.08 inches of chassis depth plus room for rear cables, adequate ventilation, and enough structural support for the 42.99 lb UPS and any future battery packs.
Runtime Expectations
Runtime depends on the connected load. The official internal-battery runtime chart estimates approximately:
- 100% load: 4 minutes and 51 seconds
- 70% load: 9 minutes and 50 seconds
- 50% load: 14 minutes and 46 seconds
- 30% load: 28 minutes and 39 seconds
- 10% load: 91 minutes and 19 seconds
These figures are planning estimates rather than guaranteed runtime. Battery condition, temperature, output voltage, connected equipment, configuration, and battery age can affect actual results.
Why Online Double Conversion Matters
A standard standby or line-interactive UPS may require a brief transition when utility power fails. Many devices tolerate that transition, but sensitive network, security, AV, and control systems may still reboot, disconnect, or lock up.
An online double conversion UPS continuously powers connected equipment through its inverter. This provides zero transfer time and helps isolate connected devices from fluctuations in the incoming electrical supply.
Why the Critical-Load Outlets Matter
Not every device in a rack has the same priority during an outage. A modem, router, firewall, switch, NVR, or control processor may need to remain online longer than a streamer, display, or secondary accessory.
The four critical-load outlets help organize the installation around those priorities, preserving more battery time for the equipment that matters most when an outage continues.
Why Extended Battery Support Matters
The internal batteries are mainly intended to cover short outages, prevent immediate shutdowns, and provide time for orderly shutdown or power restoration.
For installations that require longer runtime, the WB-UPS-OL-1500-8 supports up to five compatible WB-UPS-EBP-18AH48V extended battery packs. Smart Battery Detection automatically recognizes the connected packs and adjusts the charging rate.
Good Products to Pair With This UPS
Need Help Sizing the UPS?
Send us the model numbers or wattage of the devices you want to protect, your operating voltage, and your preferred runtime. We can help determine whether the WB-UPS-OL-1500-8 has enough capacity or whether a 1000VA, 2000VA, OvrC-compatible, or extended-battery configuration would be a better fit.
