Small loads still lose energy through AC
Routers and modems use little power, but running them from an AC inverter can waste some energy. Compatible DC powering can sometimes be more efficient.
Specialized runtime calculator
Wi-Fi Router & Modem Power Station Runtime Calculator
Estimate Wi-Fi router, modem, and ONT backup runtime from small network equipment loads.
Networking loads are small, so AC inverter losses matter. A powered router does not guarantee internet if ISP infrastructure is down.
1
What are you powering?
Choose the device or setup.
2
Tell us what you know
Use the easiest available input.
3
Choose your power station
Enter battery and output limits.
4
Get the result
Review runtime, checks, and matches.
How long can I keep Wi-Fi running?
Tell us what you know
Choose your network setup or enter custom watts.
Quick targets
+ Battery and output path assumptions
Internet service may still be unavailable
Your home equipment can stay powered while upstream ISP equipment is offline.
Wi-Fi Router & Modem Power Station Runtime Calculator FAQ
How many watts does a router use?
Use the adapter or device label when possible. This calculator lets you enter actual watts for router, modem, ONT, or custom equipment.
Can I power Wi-Fi for multiple days?
Often yes with a modest battery, because network equipment is usually a small load compared with appliances or heaters.
Accuracy notes
This calculator estimates electrical runtime and sizing. Actual results can change with device model, load variation, battery age, temperature, inverter idle draw, charge level, reserve settings, and manufacturer limits. Verify safety-critical loads with the device and power station documentation.