650VA Offline UPS

The AK 650VA Offline UPS is an offline UPS designed to protect multiple small loads simultaneously. Its larger 7Ah battery provides approximately 30‑40% longer runtime than the 4Ah version, enabling users to finish transactions, save documents, and gracefully shut down systems.

The unit retains the same compact dimensions (320×100×150 mm) and low noise level, making it suitable for crowded office desks and retail counters. The advanced CPU controller continuously monitors input power and automatically switches to battery mode within milliseconds, ensuring seamless protection for sensitive electronic equipment.

Core Advantages：

1. Extended Backup Time

The 12V/9Ah battery offers a significant runtime advantage – up to 10‑15 minutes at half load, giving you ample time to respond to power interruptions without panic. This is especially valuable for point‑of‑sale systems where transaction integrity is paramount.

2. Higher Power Headroom

With 390W capacity, the AK 650VA Offline UPS can comfortably support two standard PCs, a monitor, a network switch, and a small printer simultaneously – more than enough for a typical small office or home workspace.

3. Automatic Voltage Regulation (AVR)

The built‑in boost/buck AVR stabilises input voltage over a wide range (81‑145V or 145‑275V), extending battery life and ensuring your equipment receives clean power even during severe grid fluctuations.

4. Smart Battery Management

The CPU‑controlled charger optimises recharge time – reaching 90% capacity in just 8 hours – and prevents overcharging, extending the service life of the sealed lead‑acid battery.

Product Application

1. Small Office Workstations – Protect two desktop PCs, monitors, and shared printers.

2. Network Hubs – Keep routers, switches, and NAS devices online during brief outages.

3. Retail Checkout Counters – Ensure POS terminals and barcode scanners remain powered to avoid sales disruption.

4. Security Systems – Maintain CCTV cameras and DVRs recording during power dips.

Product Parameter

Customization Services

KTAC provides OEM and ODM customization for the AK-650VA to meet your brand and project needs.

Branding – Logo printing on enclosure and custom label design

Packaging – Retail-ready custom box with your artwork and branding

Communication Ports – RS232, USB, or RJ45 interface options available

Parameter Adjustments – Output voltage and alarm settings can be pre-configured

Minimum order quantity applies for customization. Lead time: 10-15 days for custom orders.

Our Commitment

KTAC stands behind every UPS unit with manufacturing experience and quality control.

24-Month Standard Warranty – Extended warranty available for select models upon request

ISO9001:2015 Certified – Quality management system across all production lines

Fully Equipped Facilities – 3 factories with 8,000m² of production floor space

100% Functional Testing – Every unit is tested before shipment, including AVR calibration and battery charge/discharge verification

Global Reach – Products exported to 30+ countries across Asia, Europe, Africa, and the Americas

FAQ

1. How long can the AK 650VA Offline UPS power a typical PC?

At 50% load (approx. 200W), you can expect 10‑12 minutes of backup – enough to save all open files and shut down properly.

2. Can I connect a laser printer to this UPS?

Laser printers have high inrush current; we recommend connecting only inkjet or small multifunction printers. Check the total wattage stays below 390W.

3. Does the unit have surge protection on data lines?

Optional RJ45 and USB ports are available for protecting network and data connections – please specify when ordering.

4. What should I do if the UPS overload alarm sounds?

When the UPS emits a double beep every second, it indicates overload. Reduce the load by unplugging non-essential devices from the UPS output. The total connected wattage should not exceed 390W (650VA). If the overload persists, the UPS may shut down to protect itself. After reducing the load, press the power button to restart the unit.

5. How do I know when the battery needs replacement?

The 12V/7Ah battery typically lasts 3 to 5 years under normal conditions. When backup time becomes noticeably shorter (e.g., from 12 minutes to under 5 minutes at the same load), or when the UPS beeps more frequently during normal operation, it is time to replace the battery. A battery that fails to hold a charge is the most common sign of end-of-life.

6. Can the AK-650VA be used with sensitive medical equipment?

The AK-650VA outputs a simulated sine wave during battery mode, which is suitable for standard office and IT equipment. For medical devices such as oxygen concentrators, CPAP machines, or patient monitors, we recommend our pure sine wave UPS models to ensure waveform compatibility and patient safety.

7. The UPS switches to battery mode frequently even when mains power seems normal. Why?

This typically happens when the input voltage falls outside the AVR correction range (81-145V or 145-275V), or when the input waveform is heavily distorted. The UPS is designed to protect your equipment from poor power quality. If this occurs frequently, consider having an electrician check your building's wiring, or try plugging the UPS into a different outlet on a separate circuit.

8. Does the AK-650VA support hot-swappable battery replacement?

No. The battery is not designed for hot-swapping. Always turn off the UPS and disconnect it from mains power before opening the battery compartment. Replacing the battery while the unit is powered on may cause electric shock or damage to the UPS. Please refer to the user manual for proper battery replacement procedures.

9. Can the650VA Offline UPS operate without a battery connected?

Yes, the AK-650VA can function as a voltage regulator (AVR) without a battery, filtering input voltage fluctuations. However, it will not provide backup power during outages. We recommend keeping a functional battery installed for full protection.

10. Is the AK-650VA compatible with 110V and 220V power systems?

Yes. The unit supports selectable input voltage configurations (110/120VAC or 220/230/240VAC). Please ensure the correct setting is selected during installation to match your local utility voltage. The wrong setting may damage the UPS or connected equipment.