Fri, Jan 17, 2020 5:28 AM

operating temperature 105DB Siren

After doing multiple quarries the consensus
seems to be the the low operating temperature of the siren is 44F.  According to NOAA the mean freeze free period for half the continental US is 180 days, this means that  the external siren isn't appropriate for half the country..  The most likely cause for the 44 degree minimum operating temperature is the batteries.  I opened up my siren and it has alkaline batteries Alkaline batteries have a significant loss of capacity at  freezing 32 F whereas Lithium batteries.retain capacity down to  Minus 40 F..  Is the simple solution to change to lithium batteries in the winter?  I suspect that using lithium AA batteries  will extend the operating temperature range of the siren otherwise it is useless for half the year.  The current dailey high where I live is around 29 F.  I'm going to install the Siren outside  and test it and then wait for the inevitable  minus 20 F day and test it again.  I will report the results.

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