Battery backup backup

The Openreach engineer who connected up our fibre service the other day suggested that the BBU would provide backup power for only about an hour. Having had experience of numerous power cuts here lasting hours and in one case two weeks, this seemed woefully under-specified.
Say I wanted to keep the ONT plus one laptop running for 48 hours use, can anyone suggest a suitable arrangement?
Given:
That the router would be disconnected and the laptop plugged directly into the ONT;
That laptop and ONT would only be powered during use, so the 48 hours could be eked out over a longer period;
That no generator is available and there is no PV power source.
That in this case, two separate power supplies would be convenient - one for laptop, the other for ONT;
That all communication is over fibre and no copper phone line exists;
That the disaster that befell the local power supply failed to disrupt the fibre network.
Or should I be looking for a Survivalist site with this question?

Mobile phone?

Buy a UPS at whatever rating you need for the duration/power consumption required.

Possibly with Wind, Solar and similar supplementary charging to the UPS.

You can charge a mobile phone in a car.

As someone who has worked on data centre power contingency, you will need a generator.
Battery backup is only meant to allow sufficient time for the graceful shutdown of equipment or to cover the time frame in which the generators can kick in.
If you really only see batteries as the solution, then you could look at the large leisure batteries used in RV/boats and do the maths to see how many you would need to handle your requirements.

If its FTTP the BBU takes pencil batteries, so just buy loads of rechargeable ones and when they go flat replace them with charged ones.

I am thinking of getting a SLA (Sealed Lead Acid) Battery for ours for when there is power cuts.

If the pencil batteries only last an hour then the ONT etc must be drawing around 800mA to 1 Amp, but that depends on how good the rechargeable batteries are that are fitted to the BBU.

Paul

In reply to a post by sandcastle:

The Openreach engineer who connected up our fibre service the other day suggested that the BBU would provide backup power for only about an hour. Having had experience of numerous power cuts here lasting hours and in one case two weeks, this seemed woefully under-specified.

I would disagree with that. It is not BTs job to provide power for devices in your house that is the job of the power distribution companies. The battery back up is to provide continuity of power for short periods such as if you needed to power off the house or a breaker tripped, or a short local power outage and to allow for a clean shut-down of the connection and potentially attached equipment.

Question - Does the BBU provide power to enable network access? There was a proposal that it only supplied power to the ATA within the modem/ONT for FVA? Not having FTTP I can't try it!

http://stakeholders.ofcom.org.uk/binaries/consultati...

Edited by ferretuk (Thu 29-Sep-16 09:41:02)

I always thought telco's had to provide the capability to be able to make phone calls during power outages which is why corded phones are powered via the phone line. I have a cordless phone and the base has battery backup so it can still be used during power outages.

Edited by simon194 (Thu 29-Sep-16 10:07:56)