james.wilson Posted November 1, 2008 Posted November 1, 2008 oops ignore my calc that was for intruder. Should of checked section i was in. If you have a look n the software section there is a tsi calculator that does fire standby time, intruder, sounder elevls, volt drop etc. Id use that for fire. securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
Chorlton Posted November 1, 2008 Posted November 1, 2008 here be a linky - http://www.thesecurityinstaller.co.uk/comm...showtopic=23764
esp-protocol Posted November 1, 2008 Posted November 1, 2008 1.25 = Ageing Factor T1 = Total Battery Standby in Hours I1 = Total Quiescent Battery Standby Load in Amperes I2 = Total Alarm Load in Amperes D = A De-Rating Factor (1.75 in the absence of manufacturer
galaxyclass Posted November 1, 2008 Posted November 1, 2008 as well as the minumum standby time of 24 hours (usually) the system must be able activate the sounders for usually half an hour at any point in the 24 hr back up time. the calculation i have is: standby current multiplied by standby time required + alarm load current multiplied by alarm time multiplied by the de-rating factor of the battery. then multiply the answer by 1.25 to allow for 25% deteriation in the battery in its 4 year life span. (the derating factor can be obtained fron the battery manufactuer, if not it is best to assume a number of 2)
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