On Tue, 18 Jun 2019 18:07:04 -0400, Lew Pitcher wrote:

> Adrian wrote:
>
>> I'm looking into getting a small UPS, that will handle a PI and an
>> external disc drive.  We seem to be a bit prone to very short power
>> outages (~1 minute), but this is causing problems with remounting drive
>> when the PI reboots.  Longer term power outages I'll live with.
>>
>> Any recommendations welcome.
>
If you don't mind the physical size, use a 7Ah 2v SLA (SLA = Sealed Lead
Accumulator, Aka A motorcycle BATTERY) with a continuously attached float-
type charger and a solid state 12v->3v DC converter. This will definitely
work and looks like it can be assembled for around 40 quid.

OTOH the GP Batteries GPACCMP10002 M-Series Portable PowerBank, 10,000mAh
Teal for 30 quid and you'll need a 5v wall-wart to charge it plus input
cable (another 10 quid, so $40 in total). The Rapid Electronics write-up
says that this unit has "Pass-through charging - recharge your devices
and the power bank at the same time" which seems like what you need.

The price estimates given above are all from the Rapid Electronics
catalogue, so it looks as if there's not much price difference between
using a Lithium-based power or an SLA-based solution.


--
Martin    | martin at
Gregorie  | gregorie dot org

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