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Geraffel-Village / Beernary

Hard- & software stack for authentication, authorization and accounting of your private beer tap via RFID tokens. Created by the Geraffel gang, it runs reliably on very simple and cheap hardware.
GNU General Public License v2.0
6 stars 2 forks source link

Add support for emergency power-source #3

Open SvenRoederer opened 9 years ago

SvenRoederer commented 9 years ago

to get a beer even when there is no mains

MicDiFebo commented 5 years ago

The first and very simply USV only consists of a battery looped in the powerline. That would keep the BC running for hours, but it is not possible to open the valve with that construction.

SvenRoederer commented 5 years ago

Not sure if a small solid car-battery is an option for the valve (or two 6V motorcycle batteries)

MicDiFebo commented 5 years ago

Surely that will work, but that is much too big for our enclosure. :-) In General we can think of using a 3cell lipo-battery like it is used in RC-modells (I used this in my Heli- and Quadcopter), but then we need a separat charging-electronic, which is a bit more complex for 3cells, because they must be balanced during charging.

SvenRoederer commented 5 years ago

at the end, we can just replace the wallwart (isn't it 12V DC) by a external battery, just by repluging. As the Pi will keep running by the mentioned USB-type UPS a short moment w/o external power is fully acceptable. Something like this 12V 5Ah-type might be enough and we can charge by a regular bench supply.

SvenRoederer commented 5 years ago

We should also keep in mind, that w/o mains, the cooler will not run and only a limited amount of fluid can be drafted "corrrectly". So there is only a limited duration we should be able to draft w/o mains, e.g. 1h / 5l beer.