Power backup for NS5 and router

[davedee]

i have a ns5 and modem router (12v) at a remote site for backhaul. i need to provide a backup power unit for it as mains is flackey

BUT the ns5 at the end of a long cat5 needs 18v

have any of you a cost effective solution for a failover supply for a few hours?

[WHT]

It sounds like you want to maintain a 12 volt power structure so that you can use a simple 12 volt battery supply for backup without using 120 volt AC to 12 or 18 volt DC power supplies.

I'd relocate the 12 volt power injector near the NS and extend the 12 volt line from the 12 volt powers supply (or battery) with separate 18 gauge cable pair.

A 20 amp/hour gel-cell will be good for 10 hours (you don't want to exhaust a battery below 50% of its capacity).

[davedee]

It sounds like you want to maintain a 12 volt power structure so that you can use a simple 12 volt battery supply for backup without using 120 volt AC to 12 or 18 volt DC power supplies.

I'd relocate the 12 volt power injector near the NS and extend the 12 volt line from the 12 volt powers supply (or battery) with separate 18 gauge cable pair.

A 20 amp/hour gel-cell will be good for 10 hours (you don't want to exhaust a battery below 50% of its capacity).
thx wht. seems a good idea. problem is running the 12v feed is real difficult!

so still open to suggestions!

[WHT]

You could run everything off a 12 volt battery systems that is float charged by the "mains" (always thought it was kinda funny what the UK calls commercial power). But that can get a little involved.

A regular off the shelf UPS would be easier. If you don't have to bend at the knees to pick it up, its probably too small.

[UBNT-Mike.Ford]

Hello Davedee,

I would recommend a APC Battery Backup350VA system.

I have used it for my Nano's here when the power goes out.

Thanks,

Mike

[kijoma]

12V car battery with one each of these :-

neat charger - also returns to charge mode after a powercut (important!)

http://www.maplin.co.uk/Module.aspx?ModuleNo=48446

Cool efficient inverter, select from 15 to 24V via a switch (to power PoE).

http://www.maplin.co.uk/Module.aspx?ModuleNo=36836

probably sold worlwide in various disguises (vanson make the latter one)


We have used this combo many times, gives us the option of power for days/weeks! if required. (battery size dependent). a bazillion times more efficient than a UPS (mains to battery to mains to ~18V.. mad!).

[UBNT-Mike.Ford]

Thats not a bad setup Kijoma,

I think im gonna get me one.

Mike

[hpstr]

Thats not a bad setup Kijoma,

I think im gonna get me one.

Mike
Hi Mike & kijoma,

did you gather any long-term experience with such a setup yet?

Does the intelligent charger get confused by the attached unit drawing current off the battery?

Did you provide any grounding?

Regards,

Hans

[kijoma]

hi,

We have this config in use for ~5 years, it works fine..

grounding for aerials is a separate thing..