FAQ
TL;DR: For keeping a router online, use a small UPS or 12 V buffered supply; a 4.5 W router ran 55 minutes on 4×AA, and "It is enough for the UPS to give a few minutes of work." [Elektroda, kriss032, post #20394891]
Why it matters: This helps home and rural users avoid dropouts during brief blackouts and protect gear from rapid power cycling.
Quick Facts
- TP-Link Archer MR400 power spec: External 12 V DC, 1 A adapter. [Elektroda, m5000, post #19515794]
- Buffered 12 V supplies offer zero transfer time with silent switching, ideal for frequent short blips. [Elektroda, m.jastrzebski, post #19515556]
- Typical cost: small 230 V UPS units around PLN 100. [Elektroda, DiZMar, post #19515547]
- Key UPS feature: choose one with “cold start” so it can start from battery. [Elektroda, DiZMar, post #19515666]
- Edge case: some UPS auto‑shutdown on very low loads after minutes; check minimum load spec. [Elektroda, Anonymous, post #19515647]
What’s the simplest way to keep my router online during short outages?
Use either a small AC UPS or a 12 V buffered DC supply. "Both solutions will meet your expectations." Pick based on convenience and how quiet you want switching to be. Keep wiring simple and match your router’s voltage. [Elektroda, Anonymous, post #19515816]
Is a 12 V / 2.1 A power supply safe for a 12 V / 1 A router?
Yes. The router only draws the current it needs. "The power supply can always be of a higher current efficiency (A)." Just ensure the voltage matches at 12 V. [Elektroda, DiZMar, post #19515925]
Why pick a buffered 12 V supply instead of a UPS for a router?
Buffered supplies switch with zero transfer time and stay silent. That avoids audible relay clicks during frequent short outages. You can buy a small buffered unit and add a battery. Ensure your router uses around 12 V. [Elektroda, m.jastrzebski, post #19515556]
Will a UPS click or pop when the power blips?
Some units click or "pop" on each switch. In quiet homes, frequent blips can be annoying. Users report hearing the relays even from another room. If silence matters, consider a buffered DC supply. [Elektroda, m.jastrzebski, post #19515556]
Can a low‑power router make a UPS turn itself off?
Yes. Certain UPS models have a minimum load threshold. With very low demand, they may power down after a few minutes to save energy. Check model specs for minimum load. [Elektroda, Anonymous, post #19515647]
Which UPS features should I look for to support a router?
Get a unit with "cold start." It can start from the battery with no mains present. That lets you boot the router even during a full outage. It also simplifies testing. [Elektroda, DiZMar, post #19515666]
How long will a small battery pack keep a router running?
Real‑world result: a 4.5 W router ran about 55 minutes on four 1.2 V 2600 mAh AA cells. That setup used an inexpensive UPS (~PLN 66). "It is enough for the UPS to give a few minutes of work." [Elektroda, kriss032, post #20394891]
How do I set up a simple DC‑buffered power source for a router?
- Use a 12 V battery (e.g., 10 Ah) and a suitable charger.
- If your router needs a different DC voltage, add a step‑down converter.
- Wire battery → converter → router, and keep the battery on charge as a buffer. [Elektroda, Krzysztof Kamienski, #19515511]
What power adapter does the TP‑Link Archer MR400 need?
The Archer MR400 requires an external 12 V DC, 1 A adapter. Match polarity and plug size when choosing alternatives. This keeps the device within its rated spec. [Elektroda, m5000, post #19515794]
How often should I replace a small UPS battery?
Plan to replace the internal battery about every five years. That’s typical for small units and part of normal maintenance. Budget for periodic replacements. [Elektroda, DiZMar, post #19515547]
Can frequent power cycling during storms damage equipment?
Yes. Rapid on/off cycles can stress sensitive electronics. One user noted that "cameras do not like it, they can be damaged" on sudden restores. A UPS buffering a few minutes can help. [Elektroda, kriss032, post #20394891]
Can a UPS power other devices while it keeps my router online?
Yes. A small UPS can also support other mains devices, like a phone charger. That adds flexibility during outages without extra gear. [Elektroda, DiZMar, post #19515547]
Will adding more AA cells increase runtime for a DC UPS?
Yes. Adding four more AA cells in parallel extended runtime to about 2.5 hours in testing. Ensure safe wiring and matching cells when expanding capacity. [Elektroda, kriss032, post #20408675]
Do I need an online (double‑conversion) UPS for my router?
No. For short outages, a basic UPS or a buffered 12 V supply is enough. "Both solutions will meet your expectations." Choose based on features and noise preferences. [Elektroda, Anonymous, post #19515816]