Include external battery for emergency power outages

Alarm · 25 Feb 2012

Yes it will.
Shame you have not got engineers codes the current draw is in diagnostics.

Panel and keypad are about 185ma. Assume a pir is about 15.

Add that up ( We are looking for standby not in alarm).

So say 5 x pir + panel = 260 7/0.260 = 26.9 hours, allowing for voltage drop and deep discharge cut off I would expect 18 hours easy.

(Awaits someone to argue the toss

)

madman41 · 25 Feb 2012

Alarm said:
(Awaits someone to argue the toss )

I aint even going to lol

bobthedob · 25 Feb 2012

Yes it will.
Shame you have not got engineers codes the current draw is in diagnostics.

Actually I thought I did have the engineer's code, but when I enter the code nothing happens? Is there a sequence to using the engineer's code?

Panel and keypad are about 185ma. Assume a pir is about 15.
Add that up ( We are looking for standby not in alarm).
So say 5 x pir + panel = 260 7/0.260 = 26.9 hours, allowing for voltage drop and deep discharge cut off I would expect 18 hours easy.

Actually 8 off PIRs and they are the 'dual action' pet safe type (need both indicators to alarm) but even with that your calculations suggest plenty of time....maybe the replacement battery is not so good!

I have just gone to the record book and the battery was replaced in Feb 2009 so that is THREE years ago! Time for a new battery I think.

Alarm · 25 Feb 2012

Bosch blueline DT 10ma each

8 x 10 + 260 blah blah = 20hours so allow 15/16 with the age of 3 yrs.

bobthedob · 25 Feb 2012

Thanks for you help.

I give in, and will talk to the alarm company on Monday. Something is not right if the battery should have lasted about 20 hours.

By the way, if I have the engineer's code should I simply be able to enter the PIN and bingo I am in? Or is it more complicated than that?

Alarm said:
Bosch blueline DT 10ma each

8 x 10 + 260 blah blah = 20hours so allow 15/16 with the age of 3 yrs.

Alarm · 25 Feb 2012

As I said, it depends on the age, when the deep discharge cuts in. You could have higher consumption.
I am doing this over a laptop not holding a test meter on the thing.
Also I missed out the external sounder (s).
Before you go off on one have them do a test, and it may be a chargeable visit.

Engineers is a prompt process, yes and no. Follow the screen.

bobthedob · 5 Mar 2012

Thanks for all of the discussions and ideas.
Here's how it all ended.

I went out and bought a pair of lovely new 7Ah batteries to replace the existing one (just to rule out any fault with the 3yr+ old battery) and a spare. Swapped that over in 5 mins.

Next to the panel (but isolated from it) I have the second 7Ah battery on its own 'intelligent' charger. If we have a major power cut then I will, disconnect the spare's charger and manually add the 7Ah battery in parallel to the one in the panel. All leads are in place already but *not* connected.

Alarm company wanted £330 to "add additional power supply and to split the system load over the two panels". I know this is the long term professional solution, but versus the 2 x £14 (inc VAT) for 2 off 7Ah batteries I went cheap.

Alarm · 5 Mar 2012

And your panel can take two batteries in parallel?
You will be there in a power cut?

Only pointing out what has been said before, at least the "correct" way would use a change over relay. Monitor the PSU and "spare" battery.

bobthedob · 5 Mar 2012

On the question of being in during the power cut - point taken and agreed.

I have simply piggy-backed the connector for the second battery onto the first battery. Electrically two identical batteries in parallel are going to be same current and voltage so I am happy that the panel can cope with that. It will just double the capacity (eg; amp hours)

Cheers

Alarm said:
And your panel can take two batteries in parallel?
You will be there in a power cut?

Only pointing out what has been said before, at least the "correct" way would use a change over relay. Monitor the PSU and "spare" battery.

Alarm · 5 Mar 2012

You miss my point I think.
Yes in a power cut you will have double the capacity, when the power is back and your not there you may well damage the panel PSU. In fact if there has been a fairly significant voltage drop ( and then Amperage) I would bet on it.

Your choice of course, only pointing out possibilities.

bobthedob · 5 Mar 2012

Yes, sorry I did miss that point earlier.

But yes I do agree with you - that is a risk.

Alarm said:
You miss my point I think.
Yes in a power cut you will have double the capacity, when the power is back and your not there you may well damage the panel PSU. In fact if there has been a fairly significant voltage drop ( and then Amperage) I would bet on it.

Your choice of course, only pointing out possibilities.

Alarm · 5 Mar 2012

Good luck anyway.

AlanE · 5 Mar 2012

Why not put a diode in series with the second battery?

That way power to the alarm can flow from the second battery but when the mains returns charge current from the panel will not be able to flow into the second one.

Alarm · 5 Mar 2012

Good idea, knew something was nagging me

Add a few more items and it could be like the box that was going to be supplied

bobthedob · 5 Mar 2012

Guys, I am liking your thinking

I have a little spare cash to play with here so I will look into that as well!!!

Spent £30 so far so I will look to expand the budget to a diode maybe

Alarm said:
Good idea, knew something was nagging me
Add a few more items and it could be like the box that was going to be supplied

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