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dswaving
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Thursday, July 8th, 2021 4:45 PM

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Battery Backup

I have my own battery backup for my comcast modem and when the power goes out or even when I just unplug the battery backup unit I will lose the internet, the modem  just get a flashing yellow light. Should the modem stay running even without power to battery backup unit.

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4 years ago

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MNtundraRET

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4 years ago

Anything that is normally plugged into electric outlets, will need to be plugged into an inverter with large enough power and outlets to handle all equipment.

That would include: computer handling your home network, router / modem, WiFi extenders (Ethernet connection better).  A large deep cycle battery is best.

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dswaving

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@MNtundraRET It is a very large battery backup that has plenty of power to power everything that's plugged into it. The modem stays powered on it just starts flashing yellow and disconnects from the internet.

4 years ago

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MNtundraRET

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Do you have a true sign-wave Inverter?   My TV did not handle using a cheaper modified sign-wave inverter.

Any chance you have a inline amplifier that would lose power. That would cause a weak signal and no joy.

(edited)

Retired Expert

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4 years ago

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EG

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108.3K Messages

4 years ago

@dswaving wrote: "  and when the power goes out"

The Comcast aerial and underground infrastructure / hardware uses municipal power. When the local power goes out, so does the internet. There are supposed to be battery backups (for their voice service AFAIK) in place on the poles. The question is whether or not they are being maintained and / or malfunctioning.

(edited)

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dswaving

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@EG 

I just unplug the battery backup to test and all the other equipment works properly. It's just the modem that doesn't seem to work on battery backup.

4 years ago

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EG

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108.3K Messages

Well you stated this "and when the power goes out" which led me to think that you were talking about a general local power outage with your electric company.

I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.

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4 years ago

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