VOIP and powering a router and ONT for 12 hours or more?

Rollerball · 2025-12-09T17:41:52+0000

Due to my location I endure relatively frequent power cuts which can last for hours, if not days. What is the best way to power my ONT and router in the event of a power failure lasting for at least 6 hours or more? This would primarily be for phone use and mainly to handle incoming calls from people who aren't aware that I have a power failure.

Perhaps one of the portable power stations? But they're not cheap, could I somehow leverage the cost out of my ISP ?

My mobile phone signal is spotty which may remove that from the equation, hence the VOIP requirement.

I'm still on copper at the moment but at some time in the past 12 months I'm due to move over to VOIP.

eveares · 2025-12-09T21:40:27+0000

High curent car battery charger + car battery + Inverter, maybe?

Harry Bloomfield · 2025-12-09T22:17:02+0000

eveares said:
High curent car battery charger + car battery + Inverter, maybe?

Leisure batteries are a better design, for this type of use, or even better a Lithium, or LiPo4. Call it 50w (allowing for inverter, inefficiency) for 10 hours = 500w, or half a Kilowatt hour. 12v x 500 = 42amp/hour battery. Double that, because lead/acid batteries, don't appreciate being discharged, much below 50% capacity, so a 85a/h battery, should easily last you 10 hours.

spile · 2025-12-10T07:43:14+0000

A 20W router on a 700VA UPS should last 3 or more hours.

Rodders53 · 2025-12-10T10:55:47+0000

UPS is the obvious 'off the shelf' solution.
Or a suitable home battery-inverter to support the whole home, with care over what is used. Or a home brew battery-inverter / power station / petrol generator.

Some ISPs will offer a solution for 'vulnerable customers' via a short term battery backup. Otherwise no chance of help from them... your electricity supply issues are not their responsibility after all!

Note that the local fibre repeater boxes will have power supplied from somewhere and in the event of long term power outage in the area your fibre will go down due to lack of a backup supply to it.

Harry Bloomfield · 2025-12-10T11:11:23+0000

Rodders53 said:
Note that the local fibre repeater boxes will have power supplied from somewhere and in the event of long term power outage in the area your fibre will go down due to lack of a backup supply to it.

We generally agreed in recent weeks, that the fibre doesn't normally need repeaters, between the user, and the exchange, and the exchange will be adequately battery/generator backed up. Therefore, all that is needed, is backup at the user/cutomer end.

The cabinets at the roadside, are for translation from fibre service, to old copper wire services, and may not have backup.

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VOIP and powering a router and ONT for 12 hours or more?

Rollerball

eveares

Harry Bloomfield

spile

Rodders53

Harry Bloomfield

DIYnot Local

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