Fire alarm design - Battery Calculation  

Thank you.

Thank you.

Hi Mr. Baiju, thank you for watching and it's nice to see you here.😀

Glad you liked it

Hi Sir. You're welcome. Likewise thanks for your appreciation. I'll be uploading more videos regarding FDAS.

You're welcome po. Thank you for your appreciation sir.

Thank you for your support. I will upload soon.

Salamat bro. Good luck to you.

Glad it was helpful!

Nice to know that. Welcome to our channel.

Thank you for watching. I'll consider that for our future videos

Hi John, first I also like to thank you for your time watching one of my videos, and please continue doing that so that I could share more once I find time to do another video. Please note that I value all of the questions here as this is a way we share our ideas and experiences. In your question, I assume we are talking about having an addressable fire alarm system where our notification appliance devices are powered from the 24Vdc auxiliary output from FACP and controlling it using a control module. Let's say the derated voltage of Aux output is 20.4Vdc and your overall wiring resistance is 3 ohms, we are not calculating them by the direct formula of ohms law which gives us 6.8A as an additional load to note. Instead, it is always part of the procedure in calculating our voltage drop to know the load first of whichever output terminal we account for. In our case here, the load connected to our aux output is an external horn strobe. If its rated current is let's say 320mA and only one of it is connected, then that 320mA will be our flowing current to the 14GaFPLR cable that has a total resistance of 3 ohms instead of 6.8A. The same 320mA will then need to be added to our batter calc as an additional load. And to know the voltage drop from your cable, .320Ax3ohms will give us 0.96V which means, only 20.4V - 0.96V= 19.44Vdc is delivered to the external horn strobe which is still acceptable as most UL notification appliance has an operating voltage range from 16-33Vdc. Hope this helps. Thank you again, John.

@@AllaboutFireProtection so how can we you ignore the effects of the wire at such long distances. So if I have a 20v battery attach 1000ft of wire it pulls no current? The FA manufactured give us a max distance calculations are convoluted. My concern is that this current never gets added to the battery calcs. I always upgrade my batter calcs a size above calcs.

Its 0.0833, its a typo error like i replied from other comments.

Thanks for watching and please don't hesitate to ask if there is any.

Yes sir, 24hrs na patay ang ac power plus 5 mins na nasa alarm state ang system dapat kaya ng battery

@@AllaboutFireProtection may gumawa po kasi na 24hrs standby and alarm state 24hrs dn, possible po ba un? battery rating niya is 40AH, calculated is 39.6AH. May battery ba na ganun?

@@ivancruda9445 hi sir ivan, minimum lang nmn yung sa nfpa if required cya s project specs pede nmn gwin din basta make sure capable yumg charger ng power supply support yung capacity ng battery mo.

@@AllaboutFireProtection Salamat po talaga malinaw na sakin. 😁

0.0833 yan sir, typo error sya. thank you for watching.

@@AllaboutFireProtection thank you sir nakita ko nga sa comment...salaamat

Nagkataon na tinanong ako ng amo kung sino daw may alam mag compute ng battery hehe...tamang nakita ko yung tutorial mo very helpful salamat ulet

@@bart901 yes sir basta may clarification ka, message ka lng dito. Salamat sir sa pagbisita mo sa channel.

Hi Andrew, that one is a typo error from me. It should be .0833. Thanks for watching.