Talk:Uninterrupted power supply

Question: Hi Mario, I would like to purchase back-up power supplies. Our building power went out the other night 20 minutes after finishing a human biopsy trial!! While we escaped a disaster this one time, I would hate to think what could happen in the future...these are trials are obviously expensive and hard to organize. I see there are many different types of back-up power supplies available. Could you let me know what features the UPS (uninterrupted power supply) should possess? Voltage, current, etc, etc. I believe I know based on the specs of the oxygraphs, but would like to verify first.

Answer:

Hi Chris, I fear there is not far much more then the specs to go by. I work from home today so can`t access the serial number of your O2ks but I think this link @OROBOROS should be helpful anyway, because old and new values are compared. Of course the typical power ratings are only useful if you assume that you already reached thermal equilibrium. Some other considerations: * switching time: In our case we use notebooks for computers, so DatLab will run some time anyway. However, once a O2k is switched off and on again WITHOUT getting any contradicting instructions from DatLab it will try to go to a hardware default temperature of 25 °C. Therefore, once there was an interruption in the power supply it is necessary to re-connect (new file) with DatLab to the O2k as soon as possible after the power is back (switched to the alternative source).

A different approach would be to contact the people who have experiences with power supplies for O2k's on expeditions, starting with Erich himself but a.) Erich is in the Everest Base camp (presumable fighting with the power supply ) right now and b.) I think these are realy rather different questions. Fasching Mario 16:53, 20 March 2013 (CET)

Addition:

Dear Mario and Chris,

my apologies, we don't have any experience with UPS systems on expeditions. Though power stability (and even oscillations thereof) can be a real drag, as they also influence POS signal stability. So far, we have just reconnected as Mario described in the Wiki after the power came back on. If it's only a short power cut, not too many data points are lost (depending on the experiment, of course). I have heard of UPS systems that connect between power socket and consumer, they consist of a kind of constantly recharging battery. Once there is a power cut, the oxygraph would be directly connected to its battery part without having to switch, so you wouldn't have to restart and data loss could be excluded. I'd go for something like this…. Cheers user:Fmark