Jump to content
Security Installer Community

Recommended Posts

Posted

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

Posted

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

Posted

Have you tried a site Search ?, Sure there's a calculator on here somewhere.

Customers Love us, Intruders Hate us.

Posted

Take a look at the nsi site, there's a quick & simplified calculator on there.

Customers Love us, Intruders Hate us.

Posted

I always thought it was x 1.2 but the BSIA example shows 1.25. 

 

Every day is a school day as they say  :unsure:

Posted

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.

  • 3 months later...
Posted
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. 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.