On this page
01. What goes wrong in a power cut02. What to back up03. Options04. How long?05. Maintain06. A typical scenario07. Common mistakes08. Quick checklist09. Frequently asked questions
Power the K40 Pro, the network switch and the router from a small UPS or a DC backup. It costs far less than the problems caused by power cuts: wrong time, dropped connections and missing punches.
Key takeaways
- Back up the terminal and the switch.
- A small UPS is enough.
- Check the battery yearly.
- Test with a planned cut.
01What goes wrong in a power cut
- Terminal reboots and may lose the clock.
- Switch dies, so the link drops.
- Punches are missed while it is off.
- The PC shuts down mid-download.
02What to back up
- The K40 Pro (a low-power device).
- The network switch or router it uses.
- Ideally the PC too.
03Options
- Small UPS (600 to 1000 VA): cheap and plug-and-play.
- DC mini-UPS for routers: keeps network gear alive for hours.
- Solar or inverter backup: for sites with frequent long outages. See solar and power backup.
04How long?
The terminal and a switch draw very little power, so even a small UPS gives hours. Size it by the total watts of what you connect.
05Maintain
Replace UPS batteries every two or three years. Check the terminal clock after outages (set time).
06A typical scenario
An Embakasi office lost its clock and connection with every blackout. A small UPS on the terminal and switch kept both alive for hours and ended the false lateness.
Illustrative example based on common cases, not a named customer.
07Common mistakes
- UPS for the terminal only.
- Undersized UPS.
- Old batteries.
- No testing.
- Ignoring the PC.
08Quick checklist
- List devices
- Total watts
- Choose UPS
- Install
- Test
- Replace batteries
09Frequently asked questions
Do I need a UPS for the terminal only?
Back up the switch too, or the terminal will be powered but disconnected.
What size UPS?
A 650 to 1000 VA unit is typical for a terminal, switch and router.
Does the terminal have an internal battery?
Many have a small battery for the clock. Do not rely on it for operation.
Can Qyvea supply UPS and solar backup?
Yes, we supply both. Message us.
This guide is part of our ZKTeco K40 and ZKBio Time.Net series. For the full start-to-finish walkthrough with screenshots, read How to Configure a ZKTeco K40 Pro with ZKBio Time.Net.
ZKTeco and ZKBio are trademarks of ZKTeco Inc. Menu names on the K40 Pro and in the software vary slightly by firmware and software version; where yours differ, look for the nearest match. Qyvea is a ZKTeco reseller and installer in Kenya.
