Batteries calculation ?

[Benzerari]

if the batteries are replaced every 4 years then there should be no danger of them dying when the 240v is removed.

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It's not always the case Grame, that's why battery calculation has to be carried out every three months, four years may be the maximum period, as you may change them 2-3 times in four years, it's still depending on how many times there was cut of power and for for how long, also for how long alarm went off while the mains was cut off, also the factor of temperature which is found to be playing a major role in reducing the life cycle of the battery..., today I found a new heater fitted under the fire alarm system less then a meter far away, I found the panel really warm as well as the batteries, wich make the batteries draw current quicker than with lower temperature...

You may have realised why the battery tester gives you Voltage, current and temperature measurments all in one test!, the tester has been designed to take into account the temperature as well...etc

Also in three months time any thing could happen!

[David Rooney]

Very careful, if measuring EMS panel’s batteries! If the LSA batteries and the lithium battery are quite flat, you may loose the configuration (program) when disconnecting the mains to measure I2 (Alarm current), as the system will be warm started! Since batteries failure monitoring in EMS panel is not like other analogue addressable systems, EMS batteries failure can be cleared out either them selves or manually then it takes longer time to come back again… as it may not

If you warm start an EMS panel you don't lose any information whatsoever.....

I think you may be talking about a cold start.

[Benzerari]

Very careful, if measuring EMS panel’s batteries! If the LSA batteries and the lithium battery are quite flat, you may loose the configuration (program) when disconnecting the mains to measure I2 (Alarm current), as the system will be warm started! Since batteries failure monitoring in EMS panel is not like other analogue addressable systems, EMS batteries failure can be cleared out either them selves or manually then it takes longer time to come back again… as it may not

If you warm start an EMS panel you don't lose any information whatsoever.....

I think you may be talking about a cold start.

Thanks Dave, I am talking in here about 'cold start' (mains disconnected, with batteries flats including lithium battery...etc).

But, even warm start will lose information, it happened to me, it's either through selecting warm start on the program or just by pressing the back reset button (in the back of the lid) , give a try but make sure you have got back up...etc

[David Rooney]

Benz we've installed about 200 EMS systems over the last 10 years.

We still service and maintain the vast majority.

If you lost information on a warm start I suggest you get onto EMS because you have a major problem.....

[David Rooney]

Very careful, if measuring EMS panel’s batteries! If the LSA batteries and the lithium battery are quite flat, you may loose the configuration (program) when disconnecting the mains to measure I2 (Alarm current),

as the system will be warm started!

If you warm start an EMS panel you don't lose any information whatsoever.....

I think you may be talking about a cold start.

Thanks Dave, I am talking in here about 'cold start' (mains disconnected, with batteries flats including lithium battery...etc).

Sorry thought you were talking about warm starting......

 ??

[Graeme]

praise the Lord

[Benzerari]

I think you may be talking about a cold start .

Sorry thought you were talking about warm starting......

I am no really sure who born first the chicken or the egg

[Benzerari]

Benz we've installed about 200 EMS systems over the last 10 years.

We still service and maintain the vast majority.

If you lost information on a warm start I suggest you get onto EMS because you have a major problem.....

Yes indeed, we had lost information and it was sorted

[David Rooney]

Thanks Dave, I am talking in here about 'cold start' (mains disconnected, with batteries flats including lithium battery...etc).

Sorry thought you were talking about warm starting......

 ??

I am no really sure who born first the chicken or the egg

I thought it was Adam.....?!

[Benzerari]

I am no really sure who born first the chicken or the egg  

I thought it was Adam.....?!

No Dinosaurs

[GregC]

Spores!!!

[Wiz]

Microbes. Adam 'ad 'em!

[Benzerari]

For a brand new system who has just been fitted and about to be commissioned, every body knows the batteries will take 24h to be fully charged once fitted...etc

Question 1: Would alarm current measurement should be taken after 24h?
Question 2: Would fire commissioning certificate be issued then, only after 24h, and not in the 1st day when
                 batteries are fitted?
Question 3: Would the current calculation taken the 1st day be considered not genuine?

Have your say!

[Wiz]

For a brand new system who has just been fitted and about to be commissioned, every body knows the batteries will take 24h to be fully charged once fitted...etc

Question 1: Would alarm current measurement should be taken after 24h?
Question 2: Would fire commissioning certificate be issued then, only after 24h, and not in the 1st day when
                 batteries are fitted?
Question 3: Would the current calculation taken the 1st day be considered not genuine?

Have your say!

1) Can be taken at any time.

However it is important to relate the current reading to the actual voltage of the battery at the time readings were taken. Using Ohms law can allow you to make adjustments. The system voltage is normally taken to be a nominal 24V dc. So If you take your alarm current readings on a battery supplying only 20V then by using Ohms law you can calculate what the alarm current would be at 24V. For example if we had a reading of 250mA at 20V it would be 300mA at 24V. If the battery voltage is reading greater than 24V we use the actual current readings taken and make no adjustment because the higher voltage reading errs on the right side for other calculations.


2) Issued on the basis of findings at the time of commissioning.


3) No.

A more important reason to leave a battery charging for at least 20 hours before taking any readings is to establish it is not being overcharged by being charged at a high rate even though 'fully charged'. This would happen if the battery charging circuit is faulty or wrongly calibrated. Continuing to charge a SLA battery at a high rate after it has reached full charge will damage it.

[Benzerari]

For a brand new system who has just been fitted and about to be commissioned, every body knows the batteries will take 24h to be fully charged once fitted...etc

Question 1: Would alarm current measurement should be taken after 24h?
Question 2: Would fire commissioning certificate be issued then, only after 24h, and not in the 1st day when
                 batteries are fitted?
Question 3: Would the current calculation taken the 1st day be considered not genuine?

Have your say!

1) Can be taken at any time.

However it is important to relate the current reading to the actual voltage of the battery at the time readings were taken. Using Ohms law can allow you to make adjustments. The system voltage is normally taken to be a nominal 24V dc. So If you take your alarm current readings on a battery supplying only 20V then by using Ohms law you can calculate what the alarm current would be at 24V. For example if we had a reading of 250mA at 20V it would be 300mA at 24V. If the battery voltage is reading greater than 24V we use the actual current readings taken and make no adjustment because the higher voltage reading errs on the right side for other calculations.

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This make sense, and this is your best answer ever Wiz. even I didn't totaly agree with all your answers