Re: UPS Backup Time Guesstimate
- From: Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx>
- Date: Sat, 15 Oct 2005 21:56:12 +0100
Len Krauss wrote:
> I'm considering a UPS to power a light load. It's a combo cordless
> phone/answering machine powered by AC to DC converter block. Input: 120v,
> 60hz, 8.5w. Output: 9vdc, 500ma.
>
> A low cost refurb UPS (APC BK280) has specs as follows:
>
> Output power capacity 280 VA, 180 Watts
> Replacement battery cartridge RBC2
> Typical backup time at half load 18.2 minutes
> Typical backup time at full load 6.7 minutes
>
> On the assumption that the cordless phone's batteries are fully charged when
> a long outage begins, I'm thinking that even less than the indicated power
> would be drawn to keep the answering base alive until the phone's batteries
> get weak, a which point more power would be drawn for charging. The phone
> would not be used during an outage, so its NiCad batteries would discharge
> just from being idle.
>
> What's your guesstimate of backup time running on UPS described above???
Just over an hour maybe ?
Graham
.
- References:
- UPS Backup Time Guesstimate
- From: Len Krauss
- UPS Backup Time Guesstimate
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