Leemh99 Posted May 16, 2019 Share Posted May 16, 2019 Hi, could some on tell me who to work out the size of a battery needed to back up the system for 12 and then 24hrs. We've just taken over a national trust site and they require 24hrs back up though out the whole system. Thanks Quote Link to comment Share on other sites More sharing options...
Leemh99 Posted May 16, 2019 Author Share Posted May 16, 2019 Hi, could some on tell me how to work out the size (Ah) of a 12v battery needed to back up the system for 12hrs and then 24hrs. We've just taken over a national trust site and they require 24hrs back up thoughout the whole system. Thanks Quote Link to comment Share on other sites More sharing options...
Specialist Posted May 16, 2019 Share Posted May 16, 2019 Have you tried a site Search ?, Sure there's a calculator on here somewhere. Quote Customers Love us, Intruders Hate us. Link to comment Share on other sites More sharing options...
Specialist Posted May 16, 2019 Share Posted May 16, 2019 Take a look at the nsi site, there's a quick & simplified calculator on there. Quote Customers Love us, Intruders Hate us. Link to comment Share on other sites More sharing options...
james.wilson Posted May 16, 2019 Share Posted May 16, 2019 Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
Leemh99 Posted May 17, 2019 Author Share Posted May 17, 2019 17 hours ago, james.wilson said: That's perfect Thank you Quote Link to comment Share on other sites More sharing options...
Amps Posted May 20, 2019 Share Posted May 20, 2019 I always thought it was x 1.2 but the BSIA example shows 1.25. Every day is a school day as they say Quote Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted May 20, 2019 Share Posted May 20, 2019 I recall it as 15 minute activation not 30 minutes. Seen as the bell timer would be 15 minutes the alarm current after 15 minutes will be different on an SAB. Was sure the standard says something along the lines of "12 (24) hours standby including one full activation"? Still useful chart tho, not a bad thing to be overspec standby capacity wise. Quote Link to comment Share on other sites More sharing options...
timeserved Posted August 27, 2019 Share Posted August 27, 2019 On 20/05/2019 at 22:34, sixwheeledbeast said: I recall it as 15 minute activation not 30 minutes. Seen as the bell timer would be 15 minutes the alarm current after 15 minutes will be different on an SAB. Was sure the standard says something along the lines of "12 (24) hours standby including one full activation"? Still useful chart tho, not a bad thing to be overspec standby capacity wise. 30 mins for fire alarms. 15 mins intruder. Quote Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted August 27, 2019 Share Posted August 27, 2019 Eh? Who mentioned fire? Quote Link to comment Share on other sites More sharing options...
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